Merge pull request #8412 from tschaub/release-v5.1.1

Changes for 5.1.1.

.github/ISSUE_TEMPLATE.md

@@ -1,8 +1,9 @@
+<!--
 Thank you for your interest in making OpenLayers better!
 
-To keep this project manageable for maintainers, we ask you to please check all boxes below before submitting an issue.
+If you are reporting a bug, please link to an example that reproduces the problem.  This will make it easier for people who may want to help you debug.
 
-- [ ] I am submitting a bug or feature request, not a usage question. Go to https://stackoverflow.com/questions/tagged/openlayers for questions.
-- [ ] I have searched GitHub to see if a similar bug or feature request has already been reported.
-- [ ] I have verified that the issue is present in the latest version of OpenLayers (see 'LATEST' on https://openlayers.org/).
-- [ ] If reporting a bug, I have created a [CodePen](https://codepen.io) or prepared a stack trace (using the latest version and unminified code, so e.g. `ol-debug.js`, not `ol.js`) that shows the issue.
+If you have a usage question, you might want to try Stack Overflow first: https://stackoverflow.com/questions/tagged/openlayers
+
+Thanks
+-->

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,8 +1,13 @@
+<!--
 Thank you for your interest in making OpenLayers better!
 
-In order to get your proposed changes merged into the master branch, we ask you to please make sure the following boxes are checked *before* submitting your pull request.
+Before submitting a pull request, it is best to open an issue describing the bug you are fixing or the feature you are proposing to add.
 
-- [ ] This pull request addresses an issue that has been marked with the 'Pull request accepted' label & I have added the link to that issue.
-- [ ] It contains one or more small, incremental, logically separate commits, with no merge commits.
-- [ ] I have used clear commit messages.
-- [ ] Existing tests pass for me locally & I have added or updated tests for new or changed functionality.
+Here are some other tips that make pull requests easier to review:
+
+ * Commits in the branch are small and logically separated (with no unnecessary merge commits).
+ * Commit messages are clear.
+ * Existing tests pass, new functionality is covered by new tests, and fixes have regression tests.
+
+Thanks
+-->

.gitignore

@@ -2,4 +2,3 @@
 /coverage/
 /dist/
 node_modules/
-src/index.js

README.md

@@ -1,23 +1,44 @@
 # OpenLayers
 
-[![Travis CI Status](https://secure.travis-ci.org/openlayers/openlayers.svg)](http://travis-ci.org/#!/openlayers/openlayers)
-[![Greenkeeper badge](https://badges.greenkeeper.io/openlayers/openlayers.svg)](https://greenkeeper.io/)
-[![Coverage Status](https://coveralls.io/repos/github/openlayers/openlayers/badge.svg?branch=master)](https://coveralls.io/github/openlayers/openlayers?branch=master)
-[![OSGeo Project](https://img.shields.io/badge/OSGeo-Project-brightgreen.svg)](http://osgeo.org/)
-[![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/openlayers/badge?style=rounded)](https://www.jsdelivr.com/package/npm/openlayers)
-
 [OpenLayers](https://openlayers.org/) is a high-performance, feature-packed library for creating interactive maps on the web. It can display map tiles, vector data and markers loaded from any source on any web page. OpenLayers has been developed to further the use of geographic information of all kinds. It is completely free, Open Source JavaScript, released under the 2-clause BSD License (also known as the FreeBSD).
 
 ## Getting Started
 
-Use one of the following methods to use OpenLayers in your project:
+Install the [`ol` package](https://www.npmjs.com/package/ol):
 
-* For use with webpack, Rollup, Browserify, or other module bundlers, install the [`ol` package](https://www.npmjs.com/package/ol):
-    ```
-    npm install ol
-    ```
+```
+npm install ol
+```
 
-* If you just want to add a `<script>` tag to test things out, you can link directly to one of the full builds from [cdnjs](https://cdnjs.com/libraries/openlayers) (not recommended for production)
+Import just what you need for your application:
+
+```js
+import Map from 'ol/Map';
+import View from 'ol/View';
+import TileLayer from 'ol/layer/Tile';
+import XYZ from 'ol/source/XYZ';
+
+new Map({
+  target: 'map',
+  layers: [
+    new TileLayer({
+      source: new XYZ({
+        url: 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png'
+      })
+    })
+  ],
+  view: new View({
+    center: [0, 0],
+    zoom: 2
+  })
+});
+```
+
+See the following examples for more detail on bundling OpenLayers with your application:
+
+ * Using [Rollup](https://github.com/openlayers/ol-rollup)
+ * Using [Webpack](https://github.com/openlayers/ol-webpack)
+ * Using [Parcel](https://github.com/openlayers/ol-parcel)
 
 ## Supported Browsers
 
@@ -39,3 +60,5 @@ Please see our guide on [contributing](CONTRIBUTING.md) if you're interested in
 
 - Need help? Find it on [Stack Overflow using the tag 'openlayers'](http://stackoverflow.com/questions/tagged/openlayers)
 - Follow [@openlayers](https://twitter.com/openlayers) on Twitter
+
+[![Build Status](https://travis-ci.org/openlayers/openlayers.svg?branch=master)](https://travis-ci.org/openlayers/openlayers)

changelog/upgrade-notes.md

@@ -1,5 +1,11 @@
 ## Upgrade notes
 
+### v5.1.0
+
+#### Geometry constructor and `setCoordinates` no longer accept `null` coordinates
+
+Geometries (`ol/geom/*`) now need to be constructed with valid coordinates (center for `ol/geom/Circle`) as first constructor argument. The same applies to the `setCoordinates()` (`setCenter() for `ol/geom/Circle`) method.
+
 ### v5.0.0
 
 #### Renamed `ol/source/TileUTFGrid` to `ol/source/UTFGrid`

changelog/v5.0.1.md

@@ -0,0 +1,8 @@
+# 5.0.1
+
+The v5.0.1 release helps reduce bundle sizes for bundlers that support the `"sideEffects": "false"`option in `package.json`, and fixes website documentation regarding cdn locations and debug build which has been replaced by source maps.
+
+## Fixes
+
+ * [#8341](https://github.com/openlayers/openlayers/pull/8341) - Set sideEffects: false flag ([@ahocevar](https://github.com/ahocevar))
+ * [#8342](https://github.com/openlayers/openlayers/pull/8342) - Fix links and description in quickstart tutorial ([@ahocevar](https://github.com/ahocevar))

changelog/v5.0.2.md

@@ -0,0 +1,7 @@
+# 5.0.2
+
+The v5.0.2 release updates the package readme with new example projects.
+
+## Fixes
+
+ * [#8332](https://github.com/openlayers/openlayers/pull/8343) - Starter projects ([@tschaub](https://github.com/tschaub))

changelog/v5.0.3.md

@@ -0,0 +1,9 @@
+# 5.0.3
+
+The v5.0.3 fixes a regression in the vector tile renderer and improves the built examples and release package.
+
+## Fixes
+
+ * [#8364](https://github.com/openlayers/openlayers/pull/8364) - Make examples work in IE11 ([@ahocevar](https://github.com/ahocevar))
+ * [#8363](https://github.com/openlayers/openlayers/pull/8363) - Autogenerate src/ol/package.json ([@ahocevar](https://github.com/ahocevar))
+ * [#8371](https://github.com/openlayers/openlayers/pull/8371) - Skip rendering when there is no replay group ([@ahocevar](https://github.com/ahocevar))

changelog/v5.1.0.md

@@ -0,0 +1,64 @@
+# v5.1.0
+
+The 5.1 release adds a few new features a handful of fixes.  You should be able to upgrade without any additional work.  See the one note below regarding `null` geometry coordinates.
+
+We're working toward type checking with TypeScript.  This will complete our move away from using the Closure Compiler for type checking and compilation.  We're excited about the improved experience for application developers and will highlight some of the benefit in upcoming releases.
+
+### Upgrade Notes
+
+#### Geometry constructor and `setCoordinates` no longer accept `null` coordinates
+
+Geometries (`ol/geom/*`) now need to be constructed with valid coordinates (center for `ol/geom/Circle`) as first constructor argument. The same applies to the `setCoordinates()` (`setCenter() for `ol/geom/Circle`) method.
+
+### New Features and Fixes
+
+ * [#8409](https://github.com/openlayers/openlayers/pull/8409) - Add abstract translate to ol/geom/Geometry ([@pjeweb](https://github.com/pjeweb))
+ * [#8405](https://github.com/openlayers/openlayers/pull/8405) - Minor type fixes ([@tschaub](https://github.com/tschaub))
+ * [#8401](https://github.com/openlayers/openlayers/pull/8401) - Make webpack's css loader work ([@ahocevar](https://github.com/ahocevar))
+ * [#8403](https://github.com/openlayers/openlayers/pull/8403) - Markdown links ([@tschaub](https://github.com/tschaub))
+ * [#8402](https://github.com/openlayers/openlayers/pull/8402) - Type fixes from the typescript checks ([@fredj](https://github.com/fredj))
+ * [#8400](https://github.com/openlayers/openlayers/pull/8400) - ESLint config update ([@tschaub](https://github.com/tschaub))
+ * [#8399](https://github.com/openlayers/openlayers/pull/8399) - Copy ol.css to build dir when building package ([@ahocevar](https://github.com/ahocevar))
+ * [#8397](https://github.com/openlayers/openlayers/pull/8397) - Update rollup ([@tschaub](https://github.com/tschaub))
+ * [#8385](https://github.com/openlayers/openlayers/pull/8385) - Use class syntax ([@openlayers](https://github.com/openlayers))
+ * [#8383](https://github.com/openlayers/openlayers/pull/8383) - style/Icon: Add `setAnchor()` method ([@Turbo87](https://github.com/Turbo87))
+ * [#8368](https://github.com/openlayers/openlayers/pull/8368) - Make render listeners work with image render mode ([@ahocevar](https://github.com/ahocevar))
+ * [#8376](https://github.com/openlayers/openlayers/pull/8376) - copy ZM values to polygon in makeRegular ([@virtualcitySYSTEMS](https://github.com/virtualcitySYSTEMS))
+ * [#8372](https://github.com/openlayers/openlayers/pull/8372) - Release v5.0.3 ([@openlayers](https://github.com/openlayers))
+ * [#8364](https://github.com/openlayers/openlayers/pull/8364) - Make examples work in IE11 ([@ahocevar](https://github.com/ahocevar))
+ * [#8363](https://github.com/openlayers/openlayers/pull/8363) - Autogenerate src/ol/package.json ([@ahocevar](https://github.com/ahocevar))
+ * [#8371](https://github.com/openlayers/openlayers/pull/8371) - Skip rendering when there is no replay group ([@ahocevar](https://github.com/ahocevar))
+ * [#8362](https://github.com/openlayers/openlayers/pull/8362) - Smart flat coordinates ([@ahocevar](https://github.com/ahocevar))
+ * [#8352](https://github.com/openlayers/openlayers/pull/8352) - Set `sideEffects` to `false` instead of `"false"` ([@tschaub](https://github.com/tschaub))
+ * [#8351](https://github.com/openlayers/openlayers/pull/8351) - Fix typo in release notes ([@ahocevar](https://github.com/ahocevar))
+ * [#8350](https://github.com/openlayers/openlayers/pull/8350) - Updates for v5.0.2 ([@ahocevar](https://github.com/ahocevar))
+ * [#8349](https://github.com/openlayers/openlayers/pull/8349) - Release v5.0.1 ([@ahocevar](https://github.com/ahocevar))
+ * [#8343](https://github.com/openlayers/openlayers/pull/8343) - Starter projects ([@tschaub](https://github.com/tschaub))
+ * [#8347](https://github.com/openlayers/openlayers/pull/8347) - Fix typos in release notes ([@ahocevar](https://github.com/ahocevar))
+ * [#8346](https://github.com/openlayers/openlayers/pull/8346) - Release v5.0.1 ([@openlayers](https://github.com/openlayers))
+ * [#8342](https://github.com/openlayers/openlayers/pull/8342) - Fix links and description in quickstart tutorial ([@ahocevar](https://github.com/ahocevar))
+ * [#8344](https://github.com/openlayers/openlayers/pull/8344) - Updated issue and pr templates ([@tschaub](https://github.com/tschaub))
+ * [#8341](https://github.com/openlayers/openlayers/pull/8341) - Set sideEffects: false flag ([@ahocevar](https://github.com/ahocevar))
+ * [#8333](https://github.com/openlayers/openlayers/pull/8333) - Fix wrong return type for readHref function ([@openlayers](https://github.com/openlayers))
+ * [#8329](https://github.com/openlayers/openlayers/pull/8329) - Better jsdoc typing ([@fredj](https://github.com/fredj))
+ * [#8319](https://github.com/openlayers/openlayers/pull/8319) - Remove reference to setProj4 function in documentation ([@fredj](https://github.com/fredj))
+
+
+<details>
+ <summary>Dependency Updates</summary>
+
+ * [#8410](https://github.com/openlayers/openlayers/pull/8410) - Update rollup to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8408](https://github.com/openlayers/openlayers/pull/8408) - Update rollup to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8386](https://github.com/openlayers/openlayers/pull/8386) - Update fs-extra to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8382](https://github.com/openlayers/openlayers/pull/8382) - Update webpack to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8373](https://github.com/openlayers/openlayers/pull/8373) - Update webpack to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8355](https://github.com/openlayers/openlayers/pull/8355) - Update recast to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8354](https://github.com/openlayers/openlayers/pull/8354) - Update webpack to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8348](https://github.com/openlayers/openlayers/pull/8348) - Update webpack to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8338](https://github.com/openlayers/openlayers/pull/8338) - Update recast to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8332](https://github.com/openlayers/openlayers/pull/8332) - Update webpack to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8326](https://github.com/openlayers/openlayers/pull/8326) - Update webpack to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8321](https://github.com/openlayers/openlayers/pull/8321) - Update rollup to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+ * [#8318](https://github.com/openlayers/openlayers/pull/8318) - Update webpack to the latest version 🚀 ([@openlayers](https://github.com/openlayers))
+
+</details>

changelog/v5.1.1.md

@@ -0,0 +1,3 @@
+# 5.1.1
+
+The 5.1.1 release is a patch to include the readme in the package.  See the [5.1.0 notes](https://github.com/openlayers/openlayers/releases/tag/v5.0.3) for detail on the 5.1 release.

config/rollup.js

@@ -7,7 +7,7 @@ import buble from 'rollup-plugin-buble';
 import sourcemaps from 'rollup-plugin-sourcemaps';
 
 export default {
-  input: 'src/index.js',
+  input: 'build/index.js',
   output: [
     {file: 'build/ol.js', format: 'iife', sourcemap: true}
   ],

doc/quickstart.hbs

@@ -7,6 +7,9 @@ layout: doc.hbs
 
 This primer shows you how to put a simple map on a web page.
 
+**For production, we strongly recommend bundling the application together with its dependencies, as explained in the [Building an OpenLayers Application](./tutorials/bundle.html) tutorial.**
+
+
 ## Put a map on a page
 
 Below you'll find a complete working example.  Create a new file, copy in the contents below, and open in a browser:
@@ -15,14 +18,14 @@ Below you'll find a complete working example.  Create a new file, copy in the co
 <!doctype html>
 <html lang="en">
   <head>
-    <link rel="stylesheet" href="https://openlayers.org/en/{{ latest }}/css/ol.css" type="text/css">
+    <link rel="stylesheet" href="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/{{ latest }}/css/ol.css" type="text/css">
     <style>
       .map {
         height: 400px;
         width: 100%;
       }
     </style>
-    <script src="https://openlayers.org/en/{{ latest }}/build/ol.js" type="text/javascript"></script>
+    <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/{{ latest }}/build/ol.js"></script>
     <title>OpenLayers example</title>
   </head>
   <body>
@@ -56,10 +59,8 @@ To include a map a web page you will need 3 things:
 
 ### Include OpenLayers
 
-**Caveat:** In production, it is not recommended to include dependencies as script tag. Instead, we recommend bundling the application together with its dependencies, as explained in the [Building an OpenLayers Application](./tutorials/bundle.html) tutorial.
-
 ```xml
-  <script src="https://openlayers.org/en/{{ latest }}/build/ol.js" type="text/javascript"></script>
+  <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/{{ latest }}/build/ol.js"></script>
 ```
 
 The first part is to include the JavaScript library. For the purpose of this tutorial, here we simply point to the openlayers.org website to get the whole library. In a production environment, we would build a custom version of the library including only the module needed for our application.

doc/tutorials/background.md

@@ -37,13 +37,13 @@ Class hierarchies grouped by their parent are provided in a subfolder of the pac
 For convenience, these are also available as named exports, e.g.
 
 ```js
-import {Map, View} from `ol`;
-import {Tile, Vector} from `ol/layer`;
+import {Map, View} from 'ol';
+import {Tile, Vector} from 'ol/layer';
 ```
 
 In addition to these re-exported classes, modules with lowercase names also provide constants or functions as named exports:
 
 ```js
-import {inherits} from `ol`;
-import {fromLonLat} from `ol/proj`;
+import {inherits} from 'ol';
+import {fromLonLat} from 'ol/proj';
 ```

examples/custom-controls.js

@@ -1,4 +1,4 @@
-import {inherits} from '../src/ol/index.js';
+import {inherits} from '../src/ol/util.js';
 import Map from '../src/ol/Map.js';
 import View from '../src/ol/View.js';
 import {defaults as defaultControls, Control} from '../src/ol/control.js';

examples/custom-interactions.js

@@ -1,4 +1,4 @@
-import {inherits} from '../src/ol/index.js';
+import {inherits} from '../src/ol/util.js';
 import Feature from '../src/ol/Feature.js';
 import Map from '../src/ol/Map.js';
 import View from '../src/ol/View.js';
@@ -29,7 +29,7 @@ app.Drag = function() {
   });
 
   /**
-   * @type {module:ol~Pixel}
+   * @type {module:ol/pixel~Pixel}
    * @private
    */
   this.coordinate_ = null;

examples/webpack/config.js

@@ -18,6 +18,18 @@ module.exports = {
   context: src,
   target: 'web',
   entry: entry,
+  module: {
+    rules: [{
+      use: {
+        loader: 'buble-loader'
+      },
+      test: /\.js$/,
+      include: [
+        path.join(__dirname, '..', '..', 'src'),
+        path.join(__dirname, '..')
+      ]
+    }]
+  },
   optimization: {
     runtimeChunk: {
       name: 'common'

examples/webpack/example-builder.js

@@ -64,20 +64,20 @@ function createWordIndex(exampleData) {
 /**
  * Gets the source for the chunk that matches the jsPath
  * @param {Object} chunk Chunk.
- * @param {string} jsPath Path of the file.
+ * @param {string} jsName Name of the file.
  * @return {string} The source.
  */
-function getJsSource(chunk, jsPath) {
+function getJsSource(chunk, jsName) {
   let jsSource;
   for (let i = 0, ii = chunk.modules.length; i < ii; ++i) {
     const module = chunk.modules[i];
     if (module.modules) {
-      jsSource = getJsSource(module, jsPath);
+      jsSource = getJsSource(module, jsName);
       if (jsSource) {
         return jsSource;
       }
     }
-    if (module.identifier == jsPath) {
+    if (module.identifier.endsWith(jsName)) {
       return module.source;
     }
   }
@@ -151,8 +151,7 @@ ExampleBuilder.prototype.render = async function(dir, chunk) {
 
   // add in script tag
   const jsName = `${name}.js`;
-  const jsPath = path.join(dir, jsName);
-  let jsSource = getJsSource(chunk, jsPath);
+  let jsSource = getJsSource(chunk, path.join('.', jsName));
   jsSource = jsSource.replace(/'\.\.\/src\//g, '\'');
   if (data.cloak) {
     for (const entry of data.cloak) {

package.json

@@ -1,12 +1,13 @@
 {
-  "name": "openlayers",
-  "version": "5.0.0",
+  "name": "ol",
+  "version": "5.1.1",
   "description": "OpenLayers mapping library",
   "keywords": [
     "map",
     "mapping",
     "ol"
   ],
+  "private": true,
   "homepage": "https://openlayers.org/",
   "scripts": {
     "lint": "eslint tasks test src/ol examples config",
@@ -15,18 +16,14 @@
     "karma": "karma start test/karma.config.js",
     "serve-examples": "webpack-dev-server --config examples/webpack/config.js --mode development --watch",
     "build-examples": "webpack --config examples/webpack/config.js --mode production",
-    "build-index": "node tasks/generate-index",
-    "set-version": "node tasks/set-version",
-    "prebuild": "npm run set-version && npm run build-index",
-    "prepare": "npm run set-version",
-    "build": "rollup --config config/rollup.js && cleancss --source-map src/ol/ol.css -o build/ol.css",
-    "presrc-closure": "npm run prebuild",
-    "src-closure": "node tasks/transform-types",
-    "pretypecheck": "npm run src-closure",
-    "typecheck": "node tasks/typecheck",
+    "build-package": "npm run transpile && npm run copy-css && node tasks/prepare-package && cp README.md build/ol",
+    "build-index": "npm run build-package && node tasks/generate-index",
+    "build-legacy": "rm -rf build && npm run build-index && rollup --config config/rollup.js && cleancss --source-map src/ol/ol.css -o build/ol.css",
+    "copy-css": "cp src/ol/ol.css build/ol/ol.css",
+    "transpile": "rm -rf build/ol && mkdir -p build && buble --input src/ol --output build/ol --no modules --sourcemap",
     "apidoc": "jsdoc config/jsdoc/api/index.md -c config/jsdoc/api/conf.json -P package.json -d build/apidoc"
   },
-  "main": "src/ol/index.js",
+  "main": "index.js",
   "repository": {
     "type": "git",
     "url": "git://github.com/openlayers/openlayers.git"
@@ -35,29 +32,24 @@
   "bugs": {
     "url": "https://github.com/openlayers/openlayers/issues"
   },
-  "browser": "dist/ol.js",
-  "style": [
-    "css/ol.css"
-  ],
   "dependencies": {
     "pbf": "3.1.0",
     "pixelworks": "1.1.0",
     "rbush": "2.0.2"
   },
   "devDependencies": {
-    "babel-core": "^6.26.3",
-    "babel-plugin-jsdoc-closure": "1.5.1",
+    "buble": "^0.19.3",
+    "buble-loader": "^0.5.1",
     "chaikin-smooth": "^1.0.4",
     "clean-css-cli": "4.1.11",
     "copy-webpack-plugin": "^4.4.1",
     "coveralls": "3.0.1",
     "eslint": "5.0.1",
-    "eslint-config-openlayers": "^9.2.0",
+    "eslint-config-openlayers": "^11.0.0",
     "expect.js": "0.3.1",
     "front-matter": "^2.1.2",
-    "fs-extra": "^6.0.0",
+    "fs-extra": "^7.0.0",
     "glob": "^7.1.2",
-    "google-closure-compiler": "20180610.0.2",
     "handlebars": "4.0.11",
     "istanbul": "0.4.5",
     "jquery": "3.3.1",
@@ -75,8 +67,7 @@
     "mustache": "^2.3.0",
     "pixelmatch": "^4.0.2",
     "proj4": "2.4.4",
-    "recast": "0.15.0",
-    "rollup": "0.61.2",
+    "rollup": "0.63.4",
     "rollup-plugin-buble": "0.19.2",
     "rollup-plugin-commonjs": "9.1.3",
     "rollup-plugin-node-resolve": "3.3.0",
@@ -86,12 +77,14 @@
     "uglifyjs-webpack-plugin": "^1.2.5",
     "url-polyfill": "^1.0.13",
     "walk": "^2.3.9",
-    "webpack": "4.12.1",
-    "webpack-cli": "^3.0.3",
+    "webpack": "4.16.1",
+    "webpack-cli": "^3.0.8",
     "webpack-dev-server": "^3.1.4"
   },
   "eslintConfig": {
     "extends": "openlayers"
   },
-  "sideEffects": false
+  "sideEffects": [
+    "ol.css"
+  ]
 }

src/ol/AssertionError.js

@@ -1,29 +1,28 @@
 /**
  * @module ol/AssertionError
  */
-import {VERSION, inherits} from './util.js';
+import {VERSION} from './util.js';
 
 /**
  * Error object thrown when an assertion failed. This is an ECMA-262 Error,
  * extended with a `code` property.
- * @see {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error}
- * @constructor
- * @extends {Error}
- * @param {number} code Error code.
+ * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error.
  */
-const AssertionError = function(code) {
-
-  const path = VERSION.split('-')[0];
+class AssertionError extends Error {
 
   /**
-   * @type {string}
+   * @param {number} code Error code.
    */
-  this.message = 'Assertion failed. See https://openlayers.org/en/' + path +
+  constructor(code) {
+    const path = VERSION.split('-')[0];
+    const message = 'Assertion failed. See https://openlayers.org/en/' + path +
     '/doc/errors/#' + code + ' for details.';
 
+    super(message);
+
     /**
      * Error code. The meaning of the code can be found on
-   * {@link https://openlayers.org/en/latest/doc/errors/} (replace `latest` with
+     * https://openlayers.org/en/latest/doc/errors/ (replace `latest` with
      * the version found in the OpenLayers script's header comment if a version
      * other than the latest is used).
      * @type {number}
@@ -31,10 +30,15 @@ const AssertionError = function(code) {
      */
     this.code = code;
 
+    /**
+     * @type {string}
+     */
     this.name = 'AssertionError';
 
-};
+    // Re-assign message, see https://github.com/Rich-Harris/buble/issues/40
+    this.message = message;
+  }
 
-inherits(AssertionError, Error);
+}
 
 export default AssertionError;

src/ol/Collection.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/Collection
  */
-import {inherits} from './util.js';
 import AssertionError from './AssertionError.js';
 import CollectionEventType from './CollectionEventType.js';
 import BaseObject from './Object.js';
@@ -21,15 +20,15 @@ const Property = {
  * @classdesc
  * Events emitted by {@link module:ol/Collection~Collection} instances are instances of this
  * type.
- *
- * @constructor
- * @extends {module:ol/events/Event}
+ */
+export class CollectionEvent extends Event {
+
+  /**
    * @param {module:ol/CollectionEventType} type Type.
    * @param {*=} opt_element Element.
    */
-export const CollectionEvent = function(type, opt_element) {
-
-  Event.call(this, type);
+  constructor(type, opt_element) {
+    super(type);
 
     /**
      * The element that is added to or removed from the collection.
@@ -38,9 +37,9 @@ export const CollectionEvent = function(type, opt_element) {
      */
     this.element = opt_element;
 
-};
+  }
 
-inherits(CollectionEvent, Event);
+}
 
 
 /**
@@ -57,17 +56,18 @@ inherits(CollectionEvent, Event);
  * Collection; they trigger events on the appropriate object, not on the
  * Collection as a whole.
  *
- * @constructor
- * @extends {module:ol/Object}
- * @fires module:ol/Collection~CollectionEvent
- * @param {Array.<T>=} opt_array Array.
- * @param {module:ol/Collection~Options=} opt_options Collection options.
  * @template T
  * @api
  */
-const Collection = function(opt_array, opt_options) {
+class Collection extends BaseObject {
 
-  BaseObject.call(this);
+  /**
+   * @param {Array.<T>=} opt_array Array.
+   * @param {module:ol/Collection~Options=} opt_options Collection options.
+   */
+  constructor(opt_array, opt_options) {
+
+    super();
 
     const options = opt_options || {};
 
@@ -91,53 +91,47 @@ const Collection = function(opt_array, opt_options) {
 
     this.updateLength_();
 
-};
+  }
 
-inherits(Collection, BaseObject);
-
-
-/**
+  /**
    * Remove all elements from the collection.
    * @api
    */
-Collection.prototype.clear = function() {
+  clear() {
     while (this.getLength() > 0) {
       this.pop();
     }
-};
+  }
 
-
-/**
+  /**
    * Add elements to the collection.  This pushes each item in the provided array
    * to the end of the collection.
    * @param {!Array.<T>} arr Array.
    * @return {module:ol/Collection.<T>} This collection.
    * @api
    */
-Collection.prototype.extend = function(arr) {
+  extend(arr) {
     for (let i = 0, ii = arr.length; i < ii; ++i) {
       this.push(arr[i]);
     }
     return this;
-};
+  }
 
-
-/**
+  /**
    * Iterate over each element, calling the provided callback.
    * @param {function(T, number, Array.<T>): *} f The function to call
    *     for every element. This function takes 3 arguments (the element, the
    *     index and the array). The return value is ignored.
    * @api
    */
-Collection.prototype.forEach = function(f) {
+  forEach(f) {
     const array = this.array_;
     for (let i = 0, ii = array.length; i < ii; ++i) {
       f(array[i], i, array);
     }
-};
+  }
 
-
-/**
+  /**
    * Get a reference to the underlying Array object. Warning: if the array
    * is mutated, no events will be dispatched by the collection, and the
    * collection's "length" property won't be in sync with the actual length
@@ -145,40 +139,37 @@ Collection.prototype.forEach = function(f) {
    * @return {!Array.<T>} Array.
    * @api
    */
-Collection.prototype.getArray = function() {
+  getArray() {
     return this.array_;
-};
+  }
 
-
-/**
+  /**
    * Get the element at the provided index.
    * @param {number} index Index.
    * @return {T} Element.
    * @api
    */
-Collection.prototype.item = function(index) {
+  item(index) {
     return this.array_[index];
-};
+  }
 
-
-/**
+  /**
    * Get the length of this collection.
    * @return {number} The length of the array.
    * @observable
    * @api
    */
-Collection.prototype.getLength = function() {
+  getLength() {
     return /** @type {number} */ (this.get(Property.LENGTH));
-};
+  }
 
-
-/**
+  /**
    * Insert an element at the provided index.
    * @param {number} index Index.
    * @param {T} elem Element.
    * @api
    */
-Collection.prototype.insertAt = function(index, elem) {
+  insertAt(index, elem) {
     if (this.unique_) {
       this.assertUnique_(elem);
     }
@@ -186,43 +177,40 @@ Collection.prototype.insertAt = function(index, elem) {
     this.updateLength_();
     this.dispatchEvent(
       new CollectionEvent(CollectionEventType.ADD, elem));
-};
+  }
 
-
-/**
+  /**
    * Remove the last element of the collection and return it.
    * Return `undefined` if the collection is empty.
    * @return {T|undefined} Element.
    * @api
    */
-Collection.prototype.pop = function() {
+  pop() {
     return this.removeAt(this.getLength() - 1);
-};
+  }
 
-
-/**
+  /**
    * Insert the provided element at the end of the collection.
    * @param {T} elem Element.
    * @return {number} New length of the collection.
    * @api
    */
-Collection.prototype.push = function(elem) {
+  push(elem) {
     if (this.unique_) {
       this.assertUnique_(elem);
     }
     const n = this.getLength();
     this.insertAt(n, elem);
     return this.getLength();
-};
+  }
 
-
-/**
+  /**
    * Remove the first occurrence of an element from the collection.
    * @param {T} elem Element.
    * @return {T|undefined} The removed element or undefined if none found.
    * @api
    */
-Collection.prototype.remove = function(elem) {
+  remove(elem) {
     const arr = this.array_;
     for (let i = 0, ii = arr.length; i < ii; ++i) {
       if (arr[i] === elem) {
@@ -230,32 +218,30 @@ Collection.prototype.remove = function(elem) {
       }
     }
     return undefined;
-};
+  }
 
-
-/**
+  /**
    * Remove the element at the provided index and return it.
    * Return `undefined` if the collection does not contain this index.
    * @param {number} index Index.
    * @return {T|undefined} Value.
    * @api
    */
-Collection.prototype.removeAt = function(index) {
+  removeAt(index) {
     const prev = this.array_[index];
     this.array_.splice(index, 1);
     this.updateLength_();
     this.dispatchEvent(new CollectionEvent(CollectionEventType.REMOVE, prev));
     return prev;
-};
+  }
 
-
-/**
+  /**
    * Set the element at the provided index.
    * @param {number} index Index.
    * @param {T} elem Element.
    * @api
    */
-Collection.prototype.setAt = function(index, elem) {
+  setAt(index, elem) {
     const n = this.getLength();
     if (index < n) {
       if (this.unique_) {
@@ -273,28 +259,28 @@ Collection.prototype.setAt = function(index, elem) {
       }
       this.insertAt(index, elem);
     }
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-Collection.prototype.updateLength_ = function() {
+  updateLength_() {
     this.set(Property.LENGTH, this.array_.length);
-};
+  }
 
-
-/**
+  /**
    * @private
    * @param {T} elem Element.
    * @param {number=} opt_except Optional index to ignore.
    */
-Collection.prototype.assertUnique_ = function(elem, opt_except) {
+  assertUnique_(elem, opt_except) {
     for (let i = 0, ii = this.array_.length; i < ii; ++i) {
       if (this.array_[i] === elem && i !== opt_except) {
         throw new AssertionError(58);
       }
     }
-};
+  }
+}
+
 
 export default Collection;

src/ol/Disposable.js

@@ -5,9 +5,18 @@ import {UNDEFINED} from './functions.js';
 
 /**
  * Objects that need to clean up after themselves.
- * @constructor
  */
-const Disposable = function() {};
+class Disposable {
+  /**
+   * Clean up.
+   */
+  dispose() {
+    if (!this.disposed_) {
+      this.disposed_ = true;
+      this.disposeInternal();
+    }
+  }
+}
 
 /**
  * The object has already been disposed.
@@ -16,16 +25,6 @@ const Disposable = function() {};
  */
 Disposable.prototype.disposed_ = false;
 
-/**
- * Clean up.
- */
-Disposable.prototype.dispose = function() {
-  if (!this.disposed_) {
-    this.disposed_ = true;
-    this.disposeInternal();
-  }
-};
-
 /**
  * Extension point for disposable objects.
  * @protected

src/ol/Feature.js

@@ -4,7 +4,6 @@
 import {assert} from './asserts.js';
 import {listen, unlisten, unlistenByKey} from './events.js';
 import EventType from './events/EventType.js';
-import {inherits} from './util.js';
 import BaseObject, {getChangeEventType} from './Object.js';
 import Geometry from './geom/Geometry.js';
 import Style from './style/Style.js';
@@ -51,17 +50,19 @@ import Style from './style/Style.js';
  * var point = feature.getGeometry();
  * ```
  *
- * @constructor
- * @extends {module:ol/Object}
+ * @api
+ */
+class Feature extends BaseObject {
+
+  /**
    * @param {module:ol/geom/Geometry|Object.<string, *>=} opt_geometryOrProperties
    *     You may pass a Geometry object directly, or an object literal containing
    *     properties. If you pass an object literal, you may include a Geometry
    *     associated with a `geometry` key.
- * @api
    */
-const Feature = function(opt_geometryOrProperties) {
+  constructor(opt_geometryOrProperties) {
 
-  BaseObject.call(this);
+    super();
 
     /**
      * @private
@@ -109,18 +110,15 @@ const Feature = function(opt_geometryOrProperties) {
         this.setProperties(properties);
       }
     }
-};
+  }
 
-inherits(Feature, BaseObject);
-
-
-/**
+  /**
    * Clone this feature. If the original feature has a geometry it
    * is also cloned. The feature id is not set in the clone.
    * @return {module:ol/Feature} The clone.
    * @api
    */
-Feature.prototype.clone = function() {
+  clone() {
     const clone = new Feature(this.getProperties());
     clone.setGeometryName(this.getGeometryName());
     const geometry = this.getGeometry();
@@ -132,10 +130,9 @@ Feature.prototype.clone = function() {
       clone.setStyle(style);
     }
     return clone;
-};
+  }
 
-
-/**
+  /**
    * Get the feature's default geometry.  A feature may have any number of named
    * geometries.  The "default" geometry (the one that is rendered by default) is
    * set when calling {@link module:ol/Feature~Feature#setGeometry}.
@@ -143,71 +140,65 @@ Feature.prototype.clone = function() {
    * @api
    * @observable
    */
-Feature.prototype.getGeometry = function() {
+  getGeometry() {
     return (
       /** @type {module:ol/geom/Geometry|undefined} */ (this.get(this.geometryName_))
     );
-};
+  }
 
-
-/**
+  /**
    * Get the feature identifier.  This is a stable identifier for the feature and
    * is either set when reading data from a remote source or set explicitly by
    * calling {@link module:ol/Feature~Feature#setId}.
    * @return {number|string|undefined} Id.
    * @api
    */
-Feature.prototype.getId = function() {
+  getId() {
     return this.id_;
-};
+  }
 
-
-/**
+  /**
    * Get the name of the feature's default geometry.  By default, the default
    * geometry is named `geometry`.
    * @return {string} Get the property name associated with the default geometry
    *     for this feature.
    * @api
    */
-Feature.prototype.getGeometryName = function() {
+  getGeometryName() {
     return this.geometryName_;
-};
+  }
 
-
-/**
+  /**
    * Get the feature's style. Will return what was provided to the
    * {@link module:ol/Feature~Feature#setStyle} method.
    * @return {module:ol/style/Style|Array.<module:ol/style/Style>|module:ol/style/Style~StyleFunction} The feature style.
    * @api
    */
-Feature.prototype.getStyle = function() {
+  getStyle() {
     return this.style_;
-};
+  }
 
-
-/**
+  /**
    * Get the feature's style function.
    * @return {module:ol/style/Style~StyleFunction|undefined} Return a function
    * representing the current style of this feature.
    * @api
    */
-Feature.prototype.getStyleFunction = function() {
+  getStyleFunction() {
     return this.styleFunction_;
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-Feature.prototype.handleGeometryChange_ = function() {
+  handleGeometryChange_() {
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-Feature.prototype.handleGeometryChanged_ = function() {
+  handleGeometryChanged_() {
     if (this.geometryChangeKey_) {
       unlistenByKey(this.geometryChangeKey_);
       this.geometryChangeKey_ = null;
@@ -218,22 +209,20 @@ Feature.prototype.handleGeometryChanged_ = function() {
         EventType.CHANGE, this.handleGeometryChange_, this);
     }
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * Set the default geometry for the feature.  This will update the property
    * with the name returned by {@link module:ol/Feature~Feature#getGeometryName}.
    * @param {module:ol/geom/Geometry|undefined} geometry The new geometry.
    * @api
    * @observable
    */
-Feature.prototype.setGeometry = function(geometry) {
+  setGeometry(geometry) {
     this.set(this.geometryName_, geometry);
-};
+  }
 
-
-/**
+  /**
    * Set the style for the feature.  This can be a single style object, an array
    * of styles, or a function that takes a resolution and returns an array of
    * styles. If it is `null` the feature has no style (a `null` style).
@@ -241,14 +230,13 @@ Feature.prototype.setGeometry = function(geometry) {
    * @api
    * @fires module:ol/events/Event~Event#event:change
    */
-Feature.prototype.setStyle = function(style) {
+  setStyle(style) {
     this.style_ = style;
     this.styleFunction_ = !style ? undefined : createStyleFunction(style);
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * Set the feature id.  The feature id is considered stable and may be used when
    * requesting features or comparing identifiers returned from a remote source.
    * The feature id can be used with the
@@ -257,20 +245,19 @@ Feature.prototype.setStyle = function(style) {
    * @api
    * @fires module:ol/events/Event~Event#event:change
    */
-Feature.prototype.setId = function(id) {
+  setId(id) {
     this.id_ = id;
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * Set the property name to be used when getting the feature's default geometry.
    * When calling {@link module:ol/Feature~Feature#getGeometry}, the value of the property with
    * this name will be returned.
    * @param {string} name The property name of the default geometry.
    * @api
    */
-Feature.prototype.setGeometryName = function(name) {
+  setGeometryName(name) {
     unlisten(
       this, getChangeEventType(this.geometryName_),
       this.handleGeometryChanged_, this);
@@ -279,7 +266,8 @@ Feature.prototype.setGeometryName = function(name) {
       this, getChangeEventType(this.geometryName_),
       this.handleGeometryChanged_, this);
     this.handleGeometryChanged_();
-};
+  }
+}
 
 
 /**

src/ol/Geolocation.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/Geolocation
  */
-import {inherits} from './util.js';
 import GeolocationProperty from './GeolocationProperty.js';
 import BaseObject, {getChangeEventType} from './Object.js';
 import {listen} from './events.js';
@@ -16,8 +15,8 @@ import {get as getProjection, getTransformFromProjections, identityTransform} fr
  * @typedef {Object} Options
  * @property {boolean} [tracking=false] Start Tracking right after
  * instantiation.
- * @property {GeolocationPositionOptions} [trackingOptions] Tracking options.
- * See {@link http://www.w3.org/TR/geolocation-API/#position_options_interface}.
+ * @property {PositionOptions} [trackingOptions] Tracking options.
+ * See http://www.w3.org/TR/geolocation-API/#position_options_interface.
  * @property {module:ol/proj~ProjectionLike} [projection] The projection the position
  * is reported in.
  */
@@ -44,14 +43,16 @@ import {get as getProjection, getTransformFromProjections, identityTransform} fr
  *     });
  *
  * @fires error
- * @constructor
- * @extends {module:ol/Object}
- * @param {module:ol/Geolocation~Options=} opt_options Options.
  * @api
  */
-const Geolocation = function(opt_options) {
+class Geolocation extends BaseObject {
 
-  BaseObject.call(this);
+  /**
+   * @param {module:ol/Geolocation~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
+
+    super();
 
     const options = opt_options || {};
 
@@ -90,24 +91,20 @@ const Geolocation = function(opt_options) {
 
     this.setTracking(options.tracking !== undefined ? options.tracking : false);
 
-};
+  }
 
-inherits(Geolocation, BaseObject);
-
-
-/**
+  /**
    * @inheritDoc
    */
-Geolocation.prototype.disposeInternal = function() {
+  disposeInternal() {
     this.setTracking(false);
-  BaseObject.prototype.disposeInternal.call(this);
-};
+    super.disposeInternal();
+  }
 
-
-/**
+  /**
    * @private
    */
-Geolocation.prototype.handleProjectionChanged_ = function() {
+  handleProjectionChanged_() {
     const projection = this.getProjection();
     if (projection) {
       this.transform_ = getTransformFromProjections(
@@ -116,13 +113,12 @@ Geolocation.prototype.handleProjectionChanged_ = function() {
         this.set(GeolocationProperty.POSITION, this.transform_(this.position_));
       }
     }
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-Geolocation.prototype.handleTrackingChanged_ = function() {
+  handleTrackingChanged_() {
     if (GEOLOCATION) {
       const tracking = this.getTracking();
       if (tracking && this.watchId_ === undefined) {
@@ -135,14 +131,13 @@ Geolocation.prototype.handleTrackingChanged_ = function() {
         this.watchId_ = undefined;
       }
     }
-};
+  }
 
-
-/**
+  /**
    * @private
- * @param {GeolocationPosition} position position event.
+   * @param {Position} position position event.
    */
-Geolocation.prototype.positionChange_ = function(position) {
+  positionChange_(position) {
     const coords = position.coords;
     this.set(GeolocationProperty.ACCURACY, coords.accuracy);
     this.set(GeolocationProperty.ALTITUDE,
@@ -166,75 +161,70 @@ Geolocation.prototype.positionChange_ = function(position) {
     geometry.applyTransform(this.transform_);
     this.set(GeolocationProperty.ACCURACY_GEOMETRY, geometry);
     this.changed();
-};
+  }
 
-/**
+  /**
    * Triggered when the Geolocation returns an error.
    * @event error
    * @api
    */
 
-/**
+  /**
    * @private
- * @param {GeolocationPositionError} error error object.
+   * @param {PositionError} error error object.
    */
-Geolocation.prototype.positionError_ = function(error) {
+  positionError_(error) {
     error.type = EventType.ERROR;
     this.setTracking(false);
     this.dispatchEvent(/** @type {{type: string, target: undefined}} */ (error));
-};
+  }
 
-
-/**
+  /**
    * Get the accuracy of the position in meters.
    * @return {number|undefined} The accuracy of the position measurement in
    *     meters.
    * @observable
    * @api
    */
-Geolocation.prototype.getAccuracy = function() {
+  getAccuracy() {
     return /** @type {number|undefined} */ (this.get(GeolocationProperty.ACCURACY));
-};
+  }
 
-
-/**
+  /**
    * Get a geometry of the position accuracy.
    * @return {?module:ol/geom/Polygon} A geometry of the position accuracy.
    * @observable
    * @api
    */
-Geolocation.prototype.getAccuracyGeometry = function() {
+  getAccuracyGeometry() {
     return (
       /** @type {?module:ol/geom/Polygon} */ (this.get(GeolocationProperty.ACCURACY_GEOMETRY) || null)
     );
-};
+  }
 
-
-/**
+  /**
    * Get the altitude associated with the position.
    * @return {number|undefined} The altitude of the position in meters above mean
    *     sea level.
    * @observable
    * @api
    */
-Geolocation.prototype.getAltitude = function() {
+  getAltitude() {
     return /** @type {number|undefined} */ (this.get(GeolocationProperty.ALTITUDE));
-};
+  }
 
-
-/**
+  /**
    * Get the altitude accuracy of the position.
    * @return {number|undefined} The accuracy of the altitude measurement in
    *     meters.
    * @observable
    * @api
    */
-Geolocation.prototype.getAltitudeAccuracy = function() {
+  getAltitudeAccuracy() {
     return /** @type {number|undefined} */ (this.get(GeolocationProperty.ALTITUDE_ACCURACY));
-};
+  }
 
-
-/**
+  /**
    * Get the heading as radians clockwise from North.
    * Note: depending on the browser, the heading is only defined if the `enableHighAccuracy`
    * is set to `true` in the tracking options.
@@ -242,109 +232,104 @@ Geolocation.prototype.getAltitudeAccuracy = function() {
    * @observable
    * @api
    */
-Geolocation.prototype.getHeading = function() {
+  getHeading() {
     return /** @type {number|undefined} */ (this.get(GeolocationProperty.HEADING));
-};
+  }
 
-
-/**
+  /**
    * Get the position of the device.
    * @return {module:ol/coordinate~Coordinate|undefined} The current position of the device reported
    *     in the current projection.
    * @observable
    * @api
    */
-Geolocation.prototype.getPosition = function() {
+  getPosition() {
     return (
       /** @type {module:ol/coordinate~Coordinate|undefined} */ (this.get(GeolocationProperty.POSITION))
     );
-};
+  }
 
-
-/**
+  /**
    * Get the projection associated with the position.
    * @return {module:ol/proj/Projection|undefined} The projection the position is
    *     reported in.
    * @observable
    * @api
    */
-Geolocation.prototype.getProjection = function() {
+  getProjection() {
     return (
       /** @type {module:ol/proj/Projection|undefined} */ (this.get(GeolocationProperty.PROJECTION))
     );
-};
+  }
 
-
-/**
+  /**
    * Get the speed in meters per second.
    * @return {number|undefined} The instantaneous speed of the device in meters
    *     per second.
    * @observable
    * @api
    */
-Geolocation.prototype.getSpeed = function() {
+  getSpeed() {
     return /** @type {number|undefined} */ (this.get(GeolocationProperty.SPEED));
-};
+  }
 
-
-/**
+  /**
    * Determine if the device location is being tracked.
    * @return {boolean} The device location is being tracked.
    * @observable
    * @api
    */
-Geolocation.prototype.getTracking = function() {
+  getTracking() {
     return /** @type {boolean} */ (this.get(GeolocationProperty.TRACKING));
-};
+  }
 
-
-/**
+  /**
    * Get the tracking options.
- * @see http://www.w3.org/TR/geolocation-API/#position-options
- * @return {GeolocationPositionOptions|undefined} PositionOptions as defined by
+   * See http://www.w3.org/TR/geolocation-API/#position-options.
+   * @return {PositionOptions|undefined} PositionOptions as defined by
    *     the [HTML5 Geolocation spec
    *     ](http://www.w3.org/TR/geolocation-API/#position_options_interface).
    * @observable
    * @api
    */
-Geolocation.prototype.getTrackingOptions = function() {
-  return /** @type {GeolocationPositionOptions|undefined} */ (this.get(GeolocationProperty.TRACKING_OPTIONS));
-};
+  getTrackingOptions() {
+    return /** @type {PositionOptions|undefined} */ (this.get(GeolocationProperty.TRACKING_OPTIONS));
+  }
 
-
-/**
+  /**
    * Set the projection to use for transforming the coordinates.
    * @param {module:ol/proj~ProjectionLike} projection The projection the position is
    *     reported in.
    * @observable
    * @api
    */
-Geolocation.prototype.setProjection = function(projection) {
+  setProjection(projection) {
     this.set(GeolocationProperty.PROJECTION, getProjection(projection));
-};
+  }
 
-
-/**
+  /**
    * Enable or disable tracking.
    * @param {boolean} tracking Enable tracking.
    * @observable
    * @api
    */
-Geolocation.prototype.setTracking = function(tracking) {
+  setTracking(tracking) {
     this.set(GeolocationProperty.TRACKING, tracking);
-};
+  }
 
-
-/**
+  /**
    * Set the tracking options.
- * @see http://www.w3.org/TR/geolocation-API/#position-options
- * @param {GeolocationPositionOptions} options PositionOptions as defined by the
+   * See http://www.w3.org/TR/geolocation-API/#position-options.
+   * @param {PositionOptions} options PositionOptions as defined by the
    *     [HTML5 Geolocation spec
    *     ](http://www.w3.org/TR/geolocation-API/#position_options_interface).
    * @observable
    * @api
    */
-Geolocation.prototype.setTrackingOptions = function(options) {
+  setTrackingOptions(options) {
     this.set(GeolocationProperty.TRACKING_OPTIONS, options);
-};
+  }
+}
+
+
 export default Geolocation;

src/ol/Graticule.js

@@ -112,11 +112,14 @@ const INTERVALS = [
 
 /**
  * Render a grid for a coordinate system on a map.
- * @constructor
- * @param {module:ol/Graticule~Options=} opt_options Options.
  * @api
  */
-const Graticule = function(opt_options) {
+class Graticule {
+
+  /**
+   * @param {module:ol/Graticule~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
     const options = opt_options || {};
 
     /**
@@ -317,10 +320,9 @@ const Graticule = function(opt_options) {
     }
 
     this.setMap(options.map !== undefined ? options.map : null);
-};
+  }
 
-
-/**
+  /**
    * @param {number} lon Longitude.
    * @param {number} minLat Minimal latitude.
    * @param {number} maxLat Maximal latitude.
@@ -330,7 +332,7 @@ const Graticule = function(opt_options) {
    * @return {number} Index.
    * @private
    */
-Graticule.prototype.addMeridian_ = function(lon, minLat, maxLat, squaredTolerance, extent, index) {
+  addMeridian_(lon, minLat, maxLat, squaredTolerance, extent, index) {
     const lineString = this.getMeridian_(lon, minLat, maxLat, squaredTolerance, index);
     if (intersects(lineString.getExtent(), extent)) {
       if (this.meridiansLabels_) {
@@ -343,16 +345,16 @@ Graticule.prototype.addMeridian_ = function(lon, minLat, maxLat, squaredToleranc
       this.meridians_[index++] = lineString;
     }
     return index;
-};
+  }
 
-/**
+  /**
    * @param {module:ol/geom/LineString} lineString Meridian
    * @param {module:ol/extent~Extent} extent Extent.
    * @param {number} index Index.
    * @return {module:ol/geom/Point} Meridian point.
    * @private
    */
-Graticule.prototype.getMeridianPoint_ = function(lineString, extent, index) {
+  getMeridianPoint_(lineString, extent, index) {
     const flatCoordinates = lineString.getFlatCoordinates();
     const clampedBottom = Math.max(extent[1], flatCoordinates[1]);
     const clampedTop = Math.min(extent[3], flatCoordinates[flatCoordinates.length - 1]);
@@ -360,14 +362,17 @@ Graticule.prototype.getMeridianPoint_ = function(lineString, extent, index) {
       extent[1] + Math.abs(extent[1] - extent[3]) * this.lonLabelPosition_,
       clampedBottom, clampedTop);
     const coordinate = [flatCoordinates[0], lat];
-  const point = this.meridiansLabels_[index] !== undefined ?
-    this.meridiansLabels_[index].geom : new Point(null);
+    let point;
+    if (index in this.meridiansLabels_) {
+      point = this.meridiansLabels_[index];
       point.setCoordinates(coordinate);
+    } else {
+      point = new Point(coordinate);
+    }
     return point;
-};
+  }
 
-
-/**
+  /**
    * @param {number} lat Latitude.
    * @param {number} minLon Minimal longitude.
    * @param {number} maxLon Maximal longitude.
@@ -377,7 +382,7 @@ Graticule.prototype.getMeridianPoint_ = function(lineString, extent, index) {
    * @return {number} Index.
    * @private
    */
-Graticule.prototype.addParallel_ = function(lat, minLon, maxLon, squaredTolerance, extent, index) {
+  addParallel_(lat, minLon, maxLon, squaredTolerance, extent, index) {
     const lineString = this.getParallel_(lat, minLon, maxLon, squaredTolerance, index);
     if (intersects(lineString.getExtent(), extent)) {
       if (this.parallelsLabels_) {
@@ -390,17 +395,16 @@ Graticule.prototype.addParallel_ = function(lat, minLon, maxLon, squaredToleranc
       this.parallels_[index++] = lineString;
     }
     return index;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/geom/LineString} lineString Parallels.
    * @param {module:ol/extent~Extent} extent Extent.
    * @param {number} index Index.
    * @return {module:ol/geom/Point} Parallel point.
    * @private
    */
-Graticule.prototype.getParallelPoint_ = function(lineString, extent, index) {
+  getParallelPoint_(lineString, extent, index) {
     const flatCoordinates = lineString.getFlatCoordinates();
     const clampedLeft = Math.max(extent[0], flatCoordinates[0]);
     const clampedRight = Math.min(extent[2], flatCoordinates[flatCoordinates.length - 2]);
@@ -408,21 +412,24 @@ Graticule.prototype.getParallelPoint_ = function(lineString, extent, index) {
       extent[0] + Math.abs(extent[0] - extent[2]) * this.latLabelPosition_,
       clampedLeft, clampedRight);
     const coordinate = [lon, flatCoordinates[1]];
-  const point = this.parallelsLabels_[index] !== undefined ?
-    this.parallelsLabels_[index].geom : new Point(null);
+    let point;
+    if (index in this.parallelsLabels_) {
+      point = this.parallelsLabels_[index];
       point.setCoordinates(coordinate);
+    } else {
+      point = new Point(coordinate);
+    }
     return point;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/extent~Extent} extent Extent.
    * @param {module:ol/coordinate~Coordinate} center Center.
    * @param {number} resolution Resolution.
    * @param {number} squaredTolerance Squared tolerance.
    * @private
    */
-Graticule.prototype.createGraticule_ = function(extent, center, resolution, squaredTolerance) {
+  createGraticule_(extent, center, resolution, squaredTolerance) {
 
     const interval = this.getInterval_(resolution);
     if (interval == -1) {
@@ -507,15 +514,14 @@ Graticule.prototype.createGraticule_ = function(extent, center, resolution, squa
       this.parallelsLabels_.length = idx;
     }
 
-};
+  }
 
-
-/**
+  /**
    * @param {number} resolution Resolution.
    * @return {number} The interval in degrees.
    * @private
    */
-Graticule.prototype.getInterval_ = function(resolution) {
+  getInterval_(resolution) {
     const centerLon = this.projectionCenterLonLat_[0];
     const centerLat = this.projectionCenterLonLat_[1];
     let interval = -1;
@@ -539,20 +545,18 @@ Graticule.prototype.getInterval_ = function(resolution) {
       interval = INTERVALS[i];
     }
     return interval;
-};
+  }
 
-
-/**
+  /**
    * Get the map associated with this graticule.
    * @return {module:ol/PluggableMap} The map.
    * @api
    */
-Graticule.prototype.getMap = function() {
+  getMap() {
     return this.map_;
-};
+  }
 
-
-/**
+  /**
    * @param {number} lon Longitude.
    * @param {number} minLat Minimal latitude.
    * @param {number} maxLat Maximal latitude.
@@ -561,25 +565,28 @@ Graticule.prototype.getMap = function() {
    * @param {number} index Index.
    * @private
    */
-Graticule.prototype.getMeridian_ = function(lon, minLat, maxLat, squaredTolerance, index) {
+  getMeridian_(lon, minLat, maxLat, squaredTolerance, index) {
     const flatCoordinates = meridian(lon, minLat, maxLat, this.projection_, squaredTolerance);
-  const lineString = this.meridians_[index] !== undefined ? this.meridians_[index] : new LineString(null);
+    let lineString = this.meridians_[index];
+    if (!lineString) {
+      lineString = this.meridians_[index] = new LineString(flatCoordinates, GeometryLayout.XY);
+    } else {
       lineString.setFlatCoordinates(GeometryLayout.XY, flatCoordinates);
+      lineString.changed();
+    }
     return lineString;
-};
+  }
 
-
-/**
+  /**
    * Get the list of meridians.  Meridians are lines of equal longitude.
    * @return {Array.<module:ol/geom/LineString>} The meridians.
    * @api
    */
-Graticule.prototype.getMeridians = function() {
+  getMeridians() {
     return this.meridians_;
-};
+  }
 
-
-/**
+  /**
    * @param {number} lat Latitude.
    * @param {number} minLon Minimal longitude.
    * @param {number} maxLon Maximal longitude.
@@ -588,29 +595,32 @@ Graticule.prototype.getMeridians = function() {
    * @param {number} index Index.
    * @private
    */
-Graticule.prototype.getParallel_ = function(lat, minLon, maxLon, squaredTolerance, index) {
+  getParallel_(lat, minLon, maxLon, squaredTolerance, index) {
     const flatCoordinates = parallel(lat, minLon, maxLon, this.projection_, squaredTolerance);
-  const lineString = this.parallels_[index] !== undefined ? this.parallels_[index] : new LineString(null);
+    let lineString = this.parallels_[index];
+    if (!lineString) {
+      lineString = new LineString(flatCoordinates, GeometryLayout.XY);
+    } else {
       lineString.setFlatCoordinates(GeometryLayout.XY, flatCoordinates);
+      lineString.changed();
+    }
     return lineString;
-};
+  }
 
-
-/**
+  /**
    * Get the list of parallels.  Parallels are lines of equal latitude.
    * @return {Array.<module:ol/geom/LineString>} The parallels.
    * @api
    */
-Graticule.prototype.getParallels = function() {
+  getParallels() {
     return this.parallels_;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/render/Event} e Event.
    * @private
    */
-Graticule.prototype.handlePostCompose_ = function(e) {
+  handlePostCompose_(e) {
     const vectorContext = e.vectorContext;
     const frameState = e.frameState;
     const extent = frameState.extent;
@@ -659,14 +669,13 @@ Graticule.prototype.handlePostCompose_ = function(e) {
         vectorContext.drawGeometry(labelData.geom);
       }
     }
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/proj/Projection} projection Projection.
    * @private
    */
-Graticule.prototype.updateProjectionInfo_ = function(projection) {
+  updateProjectionInfo_(projection) {
     const epsg4326Projection = getProjection('EPSG:4326');
 
     const worldExtent = projection.getWorldExtent();
@@ -689,16 +698,15 @@ Graticule.prototype.updateProjectionInfo_ = function(projection) {
     this.projectionCenterLonLat_ = this.toLonLatTransform_(getCenter(projection.getExtent()));
 
     this.projection_ = projection;
-};
+  }
 
-
-/**
+  /**
    * Set the map for this graticule.  The graticule will be rendered on the
    * provided map.
    * @param {module:ol/PluggableMap} map Map.
    * @api
    */
-Graticule.prototype.setMap = function(map) {
+  setMap(map) {
     if (this.map_) {
       unlistenByKey(this.postcomposeListenerKey_);
       this.postcomposeListenerKey_ = null;
@@ -709,5 +717,7 @@ Graticule.prototype.setMap = function(map) {
       map.render();
     }
     this.map_ = map;
-};
+  }
+}
+
 export default Graticule;

src/ol/Image.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/Image
  */
-import {inherits} from './util.js';
 import ImageBase from './ImageBase.js';
 import ImageState from './ImageState.js';
 import {listenOnce, unlistenByKey} from './events.js';
@@ -28,9 +27,9 @@ import {getHeight} from './extent.js';
  */
 
 
-/**
- * @constructor
- * @extends {module:ol/ImageBase}
+class ImageWrapper extends ImageBase {
+
+  /**
    * @param {module:ol/extent~Extent} extent Extent.
    * @param {number|undefined} resolution Resolution.
    * @param {number} pixelRatio Pixel ratio.
@@ -38,9 +37,9 @@ import {getHeight} from './extent.js';
    * @param {?string} crossOrigin Cross origin.
    * @param {module:ol/Image~LoadFunction} imageLoadFunction Image load function.
    */
-const ImageWrapper = function(extent, resolution, pixelRatio, src, crossOrigin, imageLoadFunction) {
+  constructor(extent, resolution, pixelRatio, src, crossOrigin, imageLoadFunction) {
 
-  ImageBase.call(this, extent, resolution, pixelRatio, ImageState.IDLE);
+    super(extent, resolution, pixelRatio, ImageState.IDLE);
 
     /**
      * @private
@@ -50,7 +49,7 @@ const ImageWrapper = function(extent, resolution, pixelRatio, src, crossOrigin,
 
     /**
      * @private
-   * @type {HTMLCanvasElement|Image|HTMLVideoElement}
+     * @type {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement}
      */
     this.image_ = new Image();
     if (crossOrigin !== null) {
@@ -75,55 +74,49 @@ const ImageWrapper = function(extent, resolution, pixelRatio, src, crossOrigin,
      */
     this.imageLoadFunction_ = imageLoadFunction;
 
-};
+  }
 
-inherits(ImageWrapper, ImageBase);
-
-
-/**
+  /**
    * @inheritDoc
    * @api
    */
-ImageWrapper.prototype.getImage = function() {
+  getImage() {
     return this.image_;
-};
+  }
 
-
-/**
+  /**
    * Tracks loading or read errors.
    *
    * @private
    */
-ImageWrapper.prototype.handleImageError_ = function() {
+  handleImageError_() {
     this.state = ImageState.ERROR;
     this.unlistenImage_();
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * Tracks successful image load.
    *
    * @private
    */
-ImageWrapper.prototype.handleImageLoad_ = function() {
+  handleImageLoad_() {
     if (this.resolution === undefined) {
       this.resolution = getHeight(this.extent) / this.image_.height;
     }
     this.state = ImageState.LOADED;
     this.unlistenImage_();
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * Load the image or retry if loading previously failed.
    * Loading is taken care of by the tile queue, and calling this method is
    * only needed for preloading or for reloading in case of an error.
    * @override
    * @api
    */
-ImageWrapper.prototype.load = function() {
+  load() {
     if (this.state == ImageState.IDLE || this.state == ImageState.ERROR) {
       this.state = ImageState.LOADING;
       this.changed();
@@ -135,25 +128,25 @@ ImageWrapper.prototype.load = function() {
       ];
       this.imageLoadFunction_(this, this.src_);
     }
-};
+  }
 
-
-/**
- * @param {HTMLCanvasElement|Image|HTMLVideoElement} image Image.
+  /**
+   * @param {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} image Image.
    */
-ImageWrapper.prototype.setImage = function(image) {
+  setImage(image) {
     this.image_ = image;
-};
+  }
 
-
-/**
+  /**
    * Discards event handlers which listen for load completion or errors.
    *
    * @private
    */
-ImageWrapper.prototype.unlistenImage_ = function() {
+  unlistenImage_() {
     this.imageListenerKeys_.forEach(unlistenByKey);
     this.imageListenerKeys_ = null;
-};
+  }
+}
+
 
 export default ImageWrapper;

src/ol/ImageBase.js

@@ -1,22 +1,23 @@
 /**
  * @module ol/ImageBase
  */
-import {inherits} from './util.js';
 import EventTarget from './events/EventTarget.js';
 import EventType from './events/EventType.js';
 
 /**
- * @constructor
  * @abstract
- * @extends {module:ol/events/EventTarget}
+ */
+class ImageBase extends EventTarget {
+
+  /**
    * @param {module:ol/extent~Extent} extent Extent.
    * @param {number|undefined} resolution Resolution.
    * @param {number} pixelRatio Pixel ratio.
    * @param {module:ol/ImageState} state State.
    */
-const ImageBase = function(extent, resolution, pixelRatio, state) {
+  constructor(extent, resolution, pixelRatio, state) {
 
-  EventTarget.call(this);
+    super();
 
     /**
      * @protected
@@ -42,62 +43,55 @@ const ImageBase = function(extent, resolution, pixelRatio, state) {
      */
     this.state = state;
 
-};
+  }
 
-inherits(ImageBase, EventTarget);
-
-
-/**
+  /**
    * @protected
    */
-ImageBase.prototype.changed = function() {
+  changed() {
     this.dispatchEvent(EventType.CHANGE);
-};
+  }
 
-
-/**
+  /**
    * @return {module:ol/extent~Extent} Extent.
    */
-ImageBase.prototype.getExtent = function() {
+  getExtent() {
     return this.extent;
-};
+  }
 
-
-/**
+  /**
    * @abstract
- * @return {HTMLCanvasElement|Image|HTMLVideoElement} Image.
+   * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.
    */
-ImageBase.prototype.getImage = function() {};
+  getImage() {}
 
-
-/**
+  /**
    * @return {number} PixelRatio.
    */
-ImageBase.prototype.getPixelRatio = function() {
+  getPixelRatio() {
     return this.pixelRatio_;
-};
+  }
 
-
-/**
+  /**
    * @return {number} Resolution.
    */
-ImageBase.prototype.getResolution = function() {
+  getResolution() {
     return /** @type {number} */ (this.resolution);
-};
+  }
 
-
-/**
+  /**
    * @return {module:ol/ImageState} State.
    */
-ImageBase.prototype.getState = function() {
+  getState() {
     return this.state;
-};
+  }
 
-
-/**
+  /**
    * Load not yet loaded URI.
    * @abstract
    */
-ImageBase.prototype.load = function() {};
+  load() {}
+}
+
 
 export default ImageBase;

src/ol/ImageCanvas.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/ImageCanvas
  */
-import {inherits} from './util.js';
 import ImageBase from './ImageBase.js';
 import ImageState from './ImageState.js';
 
@@ -16,9 +15,9 @@ import ImageState from './ImageState.js';
  */
 
 
-/**
- * @constructor
- * @extends {module:ol/ImageBase}
+class ImageCanvas extends ImageBase {
+
+  /**
    * @param {module:ol/extent~Extent} extent Extent.
    * @param {number} resolution Resolution.
    * @param {number} pixelRatio Pixel ratio.
@@ -26,7 +25,11 @@ import ImageState from './ImageState.js';
    * @param {module:ol/ImageCanvas~Loader=} opt_loader Optional loader function to
    *     support asynchronous canvas drawing.
    */
-const ImageCanvas = function(extent, resolution, pixelRatio, canvas, opt_loader) {
+  constructor(extent, resolution, pixelRatio, canvas, opt_loader) {
+
+    const state = opt_loader !== undefined ? ImageState.IDLE : ImageState.LOADED;
+
+    super(extent, resolution, pixelRatio, state);
 
     /**
      * Optional canvas loader function.
@@ -35,10 +38,6 @@ const ImageCanvas = function(extent, resolution, pixelRatio, canvas, opt_loader)
      */
     this.loader_ = opt_loader !== undefined ? opt_loader : null;
 
-  const state = opt_loader !== undefined ? ImageState.IDLE : ImageState.LOADED;
-
-  ImageBase.call(this, extent, resolution, pixelRatio, state);
-
     /**
      * @private
      * @type {HTMLCanvasElement}
@@ -51,26 +50,22 @@ const ImageCanvas = function(extent, resolution, pixelRatio, canvas, opt_loader)
      */
     this.error_ = null;
 
-};
+  }
 
-inherits(ImageCanvas, ImageBase);
-
-
-/**
+  /**
    * Get any error associated with asynchronous rendering.
    * @return {Error} Any error that occurred during rendering.
    */
-ImageCanvas.prototype.getError = function() {
+  getError() {
     return this.error_;
-};
+  }
 
-
-/**
+  /**
    * Handle async drawing complete.
    * @param {Error} err Any error during drawing.
    * @private
    */
-ImageCanvas.prototype.handleLoad_ = function(err) {
+  handleLoad_(err) {
     if (err) {
       this.error_ = err;
       this.state = ImageState.ERROR;
@@ -78,25 +73,26 @@ ImageCanvas.prototype.handleLoad_ = function(err) {
       this.state = ImageState.LOADED;
     }
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-ImageCanvas.prototype.load = function() {
+  load() {
     if (this.state == ImageState.IDLE) {
       this.state = ImageState.LOADING;
       this.changed();
       this.loader_(this.handleLoad_.bind(this));
     }
-};
+  }
 
-
-/**
+  /**
    * @return {HTMLCanvasElement} Canvas element.
    */
-ImageCanvas.prototype.getImage = function() {
+  getImage() {
     return this.canvas_;
-};
+  }
+}
+
+
 export default ImageCanvas;

src/ol/ImageTile.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/ImageTile
  */
-import {inherits} from './util.js';
 import Tile from './Tile.js';
 import TileState from './TileState.js';
 import {createCanvasContext2D} from './dom.js';
@@ -14,9 +13,9 @@ import EventType from './events/EventType.js';
  * @api
  */
 
-/**
- * @constructor
- * @extends {module:ol/Tile}
+class ImageTile extends Tile {
+
+  /**
    * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.
    * @param {module:ol/TileState} state State.
    * @param {string} src Image source URI.
@@ -24,9 +23,9 @@ import EventType from './events/EventType.js';
    * @param {module:ol/Tile~LoadFunction} tileLoadFunction Tile load function.
    * @param {module:ol/Tile~Options=} opt_options Tile options.
    */
-const ImageTile = function(tileCoord, state, src, crossOrigin, tileLoadFunction, opt_options) {
+  constructor(tileCoord, state, src, crossOrigin, tileLoadFunction, opt_options) {
 
-  Tile.call(this, tileCoord, state, opt_options);
+    super(tileCoord, state, opt_options);
 
     /**
      * @private
@@ -44,7 +43,7 @@ const ImageTile = function(tileCoord, state, src, crossOrigin, tileLoadFunction,
 
     /**
      * @private
-   * @type {Image|HTMLCanvasElement}
+     * @type {HTMLImageElement|HTMLCanvasElement}
      */
     this.image_ = new Image();
     if (crossOrigin !== null) {
@@ -63,15 +62,12 @@ const ImageTile = function(tileCoord, state, src, crossOrigin, tileLoadFunction,
      */
     this.tileLoadFunction_ = tileLoadFunction;
 
-};
+  }
 
-inherits(ImageTile, Tile);
-
-
-/**
+  /**
    * @inheritDoc
    */
-ImageTile.prototype.disposeInternal = function() {
+  disposeInternal() {
     if (this.state == TileState.LOADING) {
       this.unlistenImage_();
       this.image_ = getBlankImage();
@@ -81,47 +77,43 @@ ImageTile.prototype.disposeInternal = function() {
     }
     this.state = TileState.ABORT;
     this.changed();
-  Tile.prototype.disposeInternal.call(this);
-};
+    super.disposeInternal();
+  }
 
-
-/**
+  /**
    * Get the HTML image element for this tile (may be a Canvas, Image, or Video).
    * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.
    * @api
    */
-ImageTile.prototype.getImage = function() {
+  getImage() {
     return this.image_;
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-ImageTile.prototype.getKey = function() {
+  getKey() {
     return this.src_;
-};
+  }
 
-
-/**
+  /**
    * Tracks loading or read errors.
    *
    * @private
    */
-ImageTile.prototype.handleImageError_ = function() {
+  handleImageError_() {
     this.state = TileState.ERROR;
     this.unlistenImage_();
     this.image_ = getBlankImage();
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * Tracks successful image load.
    *
    * @private
    */
-ImageTile.prototype.handleImageLoad_ = function() {
+  handleImageLoad_() {
     if (this.image_.naturalWidth && this.image_.naturalHeight) {
       this.state = TileState.LOADED;
     } else {
@@ -129,14 +121,13 @@ ImageTile.prototype.handleImageLoad_ = function() {
     }
     this.unlistenImage_();
     this.changed();
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    * @api
    */
-ImageTile.prototype.load = function() {
+  load() {
     if (this.state == TileState.ERROR) {
       this.state = TileState.IDLE;
       this.image_ = new Image();
@@ -155,18 +146,18 @@ ImageTile.prototype.load = function() {
       ];
       this.tileLoadFunction_(this, this.src_);
     }
-};
+  }
 
-
-/**
+  /**
    * Discards event handlers which listen for load completion or errors.
    *
    * @private
    */
-ImageTile.prototype.unlistenImage_ = function() {
+  unlistenImage_() {
     this.imageListenerKeys_.forEach(unlistenByKey);
     this.imageListenerKeys_ = null;
-};
+  }
+}
 
 
 /**

src/ol/Kinetic.js

@@ -6,15 +6,17 @@
  * @classdesc
  * Implementation of inertial deceleration for map movement.
  *
- * @constructor
+ * @api
+ */
+class Kinetic {
+
+  /**
    * @param {number} decay Rate of decay (must be negative).
    * @param {number} minVelocity Minimum velocity (pixels/millisecond).
    * @param {number} delay Delay to consider to calculate the kinetic
    *     initial values (milliseconds).
- * @struct
- * @api
    */
-const Kinetic = function(decay, minVelocity, delay) {
+  constructor(decay, minVelocity, delay) {
 
     /**
      * @private
@@ -51,32 +53,29 @@ const Kinetic = function(decay, minVelocity, delay) {
      * @type {number}
      */
     this.initialVelocity_ = 0;
-};
+  }
 
-
-/**
+  /**
    * FIXME empty description for jsdoc
    */
-Kinetic.prototype.begin = function() {
+  begin() {
     this.points_.length = 0;
     this.angle_ = 0;
     this.initialVelocity_ = 0;
-};
+  }
 
-
-/**
+  /**
    * @param {number} x X.
    * @param {number} y Y.
    */
-Kinetic.prototype.update = function(x, y) {
+  update(x, y) {
     this.points_.push(x, y, Date.now());
-};
+  }
 
-
-/**
+  /**
    * @return {boolean} Whether we should do kinetic animation.
    */
-Kinetic.prototype.end = function() {
+  end() {
     if (this.points_.length < 6) {
       // at least 2 points are required (i.e. there must be at least 6 elements
       // in the array)
@@ -109,21 +108,21 @@ Kinetic.prototype.end = function() {
     this.angle_ = Math.atan2(dy, dx);
     this.initialVelocity_ = Math.sqrt(dx * dx + dy * dy) / duration;
     return this.initialVelocity_ > this.minVelocity_;
-};
+  }
 
-
-/**
+  /**
    * @return {number} Total distance travelled (pixels).
    */
-Kinetic.prototype.getDistance = function() {
+  getDistance() {
     return (this.minVelocity_ - this.initialVelocity_) / this.decay_;
-};
+  }
 
-
-/**
+  /**
    * @return {number} Angle of the kinetic panning animation (radians).
    */
-Kinetic.prototype.getAngle = function() {
+  getAngle() {
     return this.angle_;
-};
+  }
+}
+
 export default Kinetic;

src/ol/Map.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/Map
  */
-import {inherits} from './util.js';
 import PluggableMap from './PluggableMap.js';
 import {defaults as defaultControls} from './control/util.js';
 import {defaults as defaultInteractions} from './interaction.js';
@@ -57,16 +56,18 @@ import CanvasVectorTileLayerRenderer from './renderer/canvas/VectorTileLayer.js'
  * options or added with `addLayer` can be groups, which can contain further
  * groups, and so on.
  *
- * @constructor
- * @extends {module:ol/PluggableMap}
- * @param {module:ol/PluggableMap~MapOptions} options Map options.
  * @fires module:ol/MapBrowserEvent~MapBrowserEvent
  * @fires module:ol/MapEvent~MapEvent
  * @fires module:ol/render/Event~RenderEvent#postcompose
  * @fires module:ol/render/Event~RenderEvent#precompose
  * @api
  */
-const Map = function(options) {
+class Map extends PluggableMap {
+
+  /**
+   * @param {module:ol/PluggableMap~MapOptions} options Map options.
+   */
+  constructor(options) {
     options = assign({}, options);
     if (!options.controls) {
       options.controls = defaultControls();
@@ -75,12 +76,10 @@ const Map = function(options) {
       options.interactions = defaultInteractions();
     }
 
-  PluggableMap.call(this, options);
-};
+    super(options);
+  }
 
-inherits(Map, PluggableMap);
-
-Map.prototype.createRenderer = function() {
+  createRenderer() {
     const renderer = new CanvasMapRenderer(this);
     renderer.registerLayerRenderers([
       CanvasImageLayerRenderer,
@@ -89,6 +88,8 @@ Map.prototype.createRenderer = function() {
       CanvasVectorTileLayerRenderer
     ]);
     return renderer;
-};
+  }
+}
+
 
 export default Map;

src/ol/MapBrowserEvent.js

@@ -1,25 +1,25 @@
 /**
  * @module ol/MapBrowserEvent
  */
-import {inherits} from './util.js';
 import MapEvent from './MapEvent.js';
 
 /**
  * @classdesc
  * Events emitted as map browser events are instances of this type.
  * See {@link module:ol/Map~Map} for which events trigger a map browser event.
- *
- * @constructor
- * @extends {module:ol/MapEvent}
+ */
+class MapBrowserEvent extends MapEvent {
+
+  /**
    * @param {string} type Event type.
    * @param {module:ol/PluggableMap} map Map.
    * @param {Event} browserEvent Browser event.
    * @param {boolean=} opt_dragging Is the map currently being dragged?
    * @param {?module:ol/PluggableMap~FrameState=} opt_frameState Frame state.
    */
-const MapBrowserEvent = function(type, map, browserEvent, opt_dragging, opt_frameState) {
+  constructor(type, map, browserEvent, opt_dragging, opt_frameState) {
 
-  MapEvent.call(this, type, map, opt_frameState);
+    super(type, map, opt_frameState);
 
     /**
      * The original browser event.
@@ -31,7 +31,7 @@ const MapBrowserEvent = function(type, map, browserEvent, opt_dragging, opt_fram
 
     /**
      * The map pixel relative to the viewport corresponding to the original browser event.
-   * @type {module:ol~Pixel}
+     * @type {module:ol/pixel~Pixel}
      * @api
      */
     this.pixel = map.getEventPixel(browserEvent);
@@ -52,31 +52,30 @@ const MapBrowserEvent = function(type, map, browserEvent, opt_dragging, opt_fram
      */
     this.dragging = opt_dragging !== undefined ? opt_dragging : false;
 
-};
+  }
 
-inherits(MapBrowserEvent, MapEvent);
-
-
-/**
+  /**
    * Prevents the default browser action.
- * @see https://developer.mozilla.org/en-US/docs/Web/API/event.preventDefault
+   * See https://developer.mozilla.org/en-US/docs/Web/API/event.preventDefault.
    * @override
    * @api
    */
-MapBrowserEvent.prototype.preventDefault = function() {
-  MapEvent.prototype.preventDefault.call(this);
+  preventDefault() {
+    super.preventDefault();
     this.originalEvent.preventDefault();
-};
+  }
 
-
-/**
+  /**
    * Prevents further propagation of the current event.
- * @see https://developer.mozilla.org/en-US/docs/Web/API/event.stopPropagation
+   * See https://developer.mozilla.org/en-US/docs/Web/API/event.stopPropagation.
    * @override
    * @api
    */
-MapBrowserEvent.prototype.stopPropagation = function() {
-  MapEvent.prototype.stopPropagation.call(this);
+  stopPropagation() {
+    super.stopPropagation();
     this.originalEvent.stopPropagation();
-};
+  }
+}
+
+
 export default MapBrowserEvent;

src/ol/MapBrowserEventHandler.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/MapBrowserEventHandler
  */
-import {inherits} from './util.js';
 import {DEVICE_PIXEL_RATIO} from './has.js';
 import MapBrowserEventType from './MapBrowserEventType.js';
 import MapBrowserPointerEvent from './MapBrowserPointerEvent.js';
@@ -10,17 +9,15 @@ import EventTarget from './events/EventTarget.js';
 import PointerEventType from './pointer/EventType.js';
 import PointerEventHandler from './pointer/PointerEventHandler.js';
 
-/**
- * @param {module:ol/PluggableMap} map The map with the viewport to
- * listen to events on.
- * @param {number=} moveTolerance The minimal distance the pointer must travel
- * to trigger a move.
- * @constructor
- * @extends {module:ol/events/EventTarget}
- */
-const MapBrowserEventHandler = function(map, moveTolerance) {
+class MapBrowserEventHandler extends EventTarget {
 
-  EventTarget.call(this);
+  /**
+   * @param {module:ol/PluggableMap} map The map with the viewport to listen to events on.
+   * @param {number=} moveTolerance The minimal distance the pointer must travel to trigger a move.
+   */
+  constructor(map, moveTolerance) {
+
+    super();
 
     /**
      * This is the element that we will listen to the real events on.
@@ -110,17 +107,14 @@ const MapBrowserEventHandler = function(map, moveTolerance) {
       PointerEventType.POINTERMOVE,
       this.relayEvent_, this);
 
-};
+  }
 
-inherits(MapBrowserEventHandler, EventTarget);
-
-
-/**
+  /**
    * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
    * event.
    * @private
    */
-MapBrowserEventHandler.prototype.emulateClick_ = function(pointerEvent) {
+  emulateClick_(pointerEvent) {
     let newEvent = new MapBrowserPointerEvent(
       MapBrowserEventType.CLICK, this.map_, pointerEvent);
     this.dispatchEvent(newEvent);
@@ -140,17 +134,16 @@ MapBrowserEventHandler.prototype.emulateClick_ = function(pointerEvent) {
         this.dispatchEvent(newEvent);
       }.bind(this), 250);
     }
-};
+  }
 
-
-/**
+  /**
    * Keeps track on how many pointers are currently active.
    *
    * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
    * event.
    * @private
    */
-MapBrowserEventHandler.prototype.updateActivePointers_ = function(pointerEvent) {
+  updateActivePointers_(pointerEvent) {
     const event = pointerEvent;
 
     if (event.type == MapBrowserEventType.POINTERUP ||
@@ -160,15 +153,14 @@ MapBrowserEventHandler.prototype.updateActivePointers_ = function(pointerEvent)
       this.trackedTouches_[event.pointerId] = true;
     }
     this.activePointers_ = Object.keys(this.trackedTouches_).length;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
    * event.
    * @private
    */
-MapBrowserEventHandler.prototype.handlePointerUp_ = function(pointerEvent) {
+  handlePointerUp_(pointerEvent) {
     this.updateActivePointers_(pointerEvent);
     const newEvent = new MapBrowserPointerEvent(
       MapBrowserEventType.POINTERUP, this.map_, pointerEvent);
@@ -192,26 +184,24 @@ MapBrowserEventHandler.prototype.handlePointerUp_ = function(pointerEvent) {
       this.documentPointerEventHandler_.dispose();
       this.documentPointerEventHandler_ = null;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
    * event.
    * @return {boolean} If the left mouse button was pressed.
    * @private
    */
-MapBrowserEventHandler.prototype.isMouseActionButton_ = function(pointerEvent) {
+  isMouseActionButton_(pointerEvent) {
     return pointerEvent.button === 0;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
    * event.
    * @private
    */
-MapBrowserEventHandler.prototype.handlePointerDown_ = function(pointerEvent) {
+  handlePointerDown_(pointerEvent) {
     this.updateActivePointers_(pointerEvent);
     const newEvent = new MapBrowserPointerEvent(
       MapBrowserEventType.POINTERDOWN, this.map_, pointerEvent);
@@ -252,15 +242,14 @@ MapBrowserEventHandler.prototype.handlePointerDown_ = function(pointerEvent) {
           this.handlePointerUp_, this)
       );
     }
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
    * event.
    * @private
    */
-MapBrowserEventHandler.prototype.handlePointerMove_ = function(pointerEvent) {
+  handlePointerMove_(pointerEvent) {
     // Between pointerdown and pointerup, pointermove events are triggered.
     // To avoid a 'false' touchmove event to be dispatched, we test if the pointer
     // moved a significant distance.
@@ -277,40 +266,37 @@ MapBrowserEventHandler.prototype.handlePointerMove_ = function(pointerEvent) {
     // https://code.google.com/p/android/issues/detail?id=19827
     // ex: Galaxy Tab P3110 + Android 4.1.1
     pointerEvent.preventDefault();
-};
+  }
 
-
-/**
+  /**
    * Wrap and relay a pointer event.  Note that this requires that the type
    * string for the MapBrowserPointerEvent matches the PointerEvent type.
    * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
    * event.
    * @private
    */
-MapBrowserEventHandler.prototype.relayEvent_ = function(pointerEvent) {
+  relayEvent_(pointerEvent) {
     const dragging = !!(this.down_ && this.isMoving_(pointerEvent));
     this.dispatchEvent(new MapBrowserPointerEvent(
       pointerEvent.type, this.map_, pointerEvent, dragging));
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
    * event.
    * @return {boolean} Is moving.
    * @private
    */
-MapBrowserEventHandler.prototype.isMoving_ = function(pointerEvent) {
+  isMoving_(pointerEvent) {
     return this.dragging_ ||
         Math.abs(pointerEvent.clientX - this.down_.clientX) > this.moveTolerance_ ||
         Math.abs(pointerEvent.clientY - this.down_.clientY) > this.moveTolerance_;
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-MapBrowserEventHandler.prototype.disposeInternal = function() {
+  disposeInternal() {
     if (this.relayedListenerKey_) {
       unlistenByKey(this.relayedListenerKey_);
       this.relayedListenerKey_ = null;
@@ -331,6 +317,9 @@ MapBrowserEventHandler.prototype.disposeInternal = function() {
       this.pointerEventHandler_.dispose();
       this.pointerEventHandler_ = null;
     }
-  EventTarget.prototype.disposeInternal.call(this);
-};
+    super.disposeInternal();
+  }
+}
+
+
 export default MapBrowserEventHandler;

src/ol/MapBrowserPointerEvent.js

@@ -1,24 +1,20 @@
 /**
  * @module ol/MapBrowserPointerEvent
  */
-import {inherits} from './util.js';
 import MapBrowserEvent from './MapBrowserEvent.js';
 
-/**
- * @constructor
- * @extends {module:ol/MapBrowserEvent}
+class MapBrowserPointerEvent extends MapBrowserEvent {
+
+  /**
    * @param {string} type Event type.
    * @param {module:ol/PluggableMap} map Map.
- * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer
- * event.
+   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer event.
    * @param {boolean=} opt_dragging Is the map currently being dragged?
    * @param {?module:ol/PluggableMap~FrameState=} opt_frameState Frame state.
    */
-const MapBrowserPointerEvent = function(type, map, pointerEvent, opt_dragging,
-  opt_frameState) {
+  constructor(type, map, pointerEvent, opt_dragging, opt_frameState) {
 
-  MapBrowserEvent.call(this, type, map, pointerEvent.originalEvent, opt_dragging,
-    opt_frameState);
+    super(type, map, pointerEvent.originalEvent, opt_dragging, opt_frameState);
 
     /**
      * @const
@@ -26,7 +22,8 @@ const MapBrowserPointerEvent = function(type, map, pointerEvent, opt_dragging,
      */
     this.pointerEvent = pointerEvent;
 
-};
+  }
+
+}
 
-inherits(MapBrowserPointerEvent, MapBrowserEvent);
 export default MapBrowserPointerEvent;

src/ol/MapEvent.js

@@ -1,23 +1,23 @@
 /**
  * @module ol/MapEvent
  */
-import {inherits} from './util.js';
 import Event from './events/Event.js';
 
 /**
  * @classdesc
  * Events emitted as map events are instances of this type.
  * See {@link module:ol/Map~Map} for which events trigger a map event.
- *
- * @constructor
- * @extends {module:ol/events/Event}
+ */
+class MapEvent extends Event {
+
+  /**
    * @param {string} type Event type.
    * @param {module:ol/PluggableMap} map Map.
    * @param {?module:ol/PluggableMap~FrameState=} opt_frameState Frame state.
    */
-const MapEvent = function(type, map, opt_frameState) {
+  constructor(type, map, opt_frameState) {
 
-  Event.call(this, type);
+    super(type);
 
     /**
      * The map where the event occurred.
@@ -33,7 +33,8 @@ const MapEvent = function(type, map, opt_frameState) {
      */
     this.frameState = opt_frameState !== undefined ? opt_frameState : null;
 
-};
+  }
+
+}
 
-inherits(MapEvent, Event);
 export default MapEvent;

src/ol/Object.js

@@ -1,7 +1,7 @@
 /**
  * @module ol/Object
  */
-import {getUid, inherits} from './util.js';
+import {getUid} from './util.js';
 import ObjectEventType from './ObjectEventType.js';
 import Observable from './Observable.js';
 import Event from './events/Event.js';
@@ -10,17 +10,17 @@ import {assign} from './obj.js';
 
 /**
  * @classdesc
- * Events emitted by {@link module:ol/Object~BaseObject} instances are instances of
- * this type.
- *
+ * Events emitted by {@link module:ol/Object~BaseObject} instances are instances of this type.
+  */
+class ObjectEvent extends Event {
+
+  /**
    * @param {string} type The event type.
    * @param {string} key The property name.
    * @param {*} oldValue The old value for `key`.
- * @extends {module:ol/events/Event}
- * @constructor
    */
-const ObjectEvent = function(type, key, oldValue) {
-  Event.call(this, type);
+  constructor(type, key, oldValue) {
+    super(type);
 
     /**
      * The name of the property whose value is changing.
@@ -37,8 +37,9 @@ const ObjectEvent = function(type, key, oldValue) {
      */
     this.oldValue = oldValue;
 
-};
-inherits(ObjectEvent, Event);
+  }
+
+}
 
 
 /**
@@ -81,16 +82,18 @@ inherits(ObjectEvent, Event);
  * Properties can be deleted by using the unset method. E.g.
  * object.unset('foo').
  *
- * @constructor
- * @extends {module:ol/Observable}
- * @param {Object.<string, *>=} opt_values An object with key-value pairs.
  * @fires module:ol/Object~ObjectEvent
  * @api
  */
-const BaseObject = function(opt_values) {
-  Observable.call(this);
+class BaseObject extends Observable {
 
-  // Call {@link module:ol~getUid} to ensure that the order of objects' ids is
+  /**
+   * @param {Object.<string, *>=} opt_values An object with key-value pairs.
+   */
+  constructor(opt_values) {
+    super();
+
+    // Call {@link module:ol/util~getUid} to ensure that the order of objects' ids is
     // the same as the order in which they were created.  This also helps to
     // ensure that object properties are always added in the same order, which
     // helps many JavaScript engines generate faster code.
@@ -105,9 +108,100 @@ const BaseObject = function(opt_values) {
     if (opt_values !== undefined) {
       this.setProperties(opt_values);
     }
-};
+  }
 
-inherits(BaseObject, Observable);
+  /**
+   * Gets a value.
+   * @param {string} key Key name.
+   * @return {*} Value.
+   * @api
+   */
+  get(key) {
+    let value;
+    if (this.values_.hasOwnProperty(key)) {
+      value = this.values_[key];
+    }
+    return value;
+  }
+
+  /**
+   * Get a list of object property names.
+   * @return {Array.<string>} List of property names.
+   * @api
+   */
+  getKeys() {
+    return Object.keys(this.values_);
+  }
+
+  /**
+   * Get an object of all property names and values.
+   * @return {Object.<string, *>} Object.
+   * @api
+   */
+  getProperties() {
+    return assign({}, this.values_);
+  }
+
+  /**
+   * @param {string} key Key name.
+   * @param {*} oldValue Old value.
+   */
+  notify(key, oldValue) {
+    let eventType;
+    eventType = getChangeEventType(key);
+    this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));
+    eventType = ObjectEventType.PROPERTYCHANGE;
+    this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));
+  }
+
+  /**
+   * Sets a value.
+   * @param {string} key Key name.
+   * @param {*} value Value.
+   * @param {boolean=} opt_silent Update without triggering an event.
+   * @api
+   */
+  set(key, value, opt_silent) {
+    if (opt_silent) {
+      this.values_[key] = value;
+    } else {
+      const oldValue = this.values_[key];
+      this.values_[key] = value;
+      if (oldValue !== value) {
+        this.notify(key, oldValue);
+      }
+    }
+  }
+
+  /**
+   * Sets a collection of key-value pairs.  Note that this changes any existing
+   * properties and adds new ones (it does not remove any existing properties).
+   * @param {Object.<string, *>} values Values.
+   * @param {boolean=} opt_silent Update without triggering an event.
+   * @api
+   */
+  setProperties(values, opt_silent) {
+    for (const key in values) {
+      this.set(key, values[key], opt_silent);
+    }
+  }
+
+  /**
+   * Unsets a property.
+   * @param {string} key Key name.
+   * @param {boolean=} opt_silent Unset without triggering an event.
+   * @api
+   */
+  unset(key, opt_silent) {
+    if (key in this.values_) {
+      const oldValue = this.values_[key];
+      delete this.values_[key];
+      if (!opt_silent) {
+        this.notify(key, oldValue);
+      }
+    }
+  }
+}
 
 
 /**
@@ -127,103 +221,4 @@ export function getChangeEventType(key) {
 }
 
 
-/**
- * Gets a value.
- * @param {string} key Key name.
- * @return {*} Value.
- * @api
- */
-BaseObject.prototype.get = function(key) {
-  let value;
-  if (this.values_.hasOwnProperty(key)) {
-    value = this.values_[key];
-  }
-  return value;
-};
-
-
-/**
- * Get a list of object property names.
- * @return {Array.<string>} List of property names.
- * @api
- */
-BaseObject.prototype.getKeys = function() {
-  return Object.keys(this.values_);
-};
-
-
-/**
- * Get an object of all property names and values.
- * @return {Object.<string, *>} Object.
- * @api
- */
-BaseObject.prototype.getProperties = function() {
-  return assign({}, this.values_);
-};
-
-
-/**
- * @param {string} key Key name.
- * @param {*} oldValue Old value.
- */
-BaseObject.prototype.notify = function(key, oldValue) {
-  let eventType;
-  eventType = getChangeEventType(key);
-  this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));
-  eventType = ObjectEventType.PROPERTYCHANGE;
-  this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));
-};
-
-
-/**
- * Sets a value.
- * @param {string} key Key name.
- * @param {*} value Value.
- * @param {boolean=} opt_silent Update without triggering an event.
- * @api
- */
-BaseObject.prototype.set = function(key, value, opt_silent) {
-  if (opt_silent) {
-    this.values_[key] = value;
-  } else {
-    const oldValue = this.values_[key];
-    this.values_[key] = value;
-    if (oldValue !== value) {
-      this.notify(key, oldValue);
-    }
-  }
-};
-
-
-/**
- * Sets a collection of key-value pairs.  Note that this changes any existing
- * properties and adds new ones (it does not remove any existing properties).
- * @param {Object.<string, *>} values Values.
- * @param {boolean=} opt_silent Update without triggering an event.
- * @api
- */
-BaseObject.prototype.setProperties = function(values, opt_silent) {
-  for (const key in values) {
-    this.set(key, values[key], opt_silent);
-  }
-};
-
-
-/**
- * Unsets a property.
- * @param {string} key Key name.
- * @param {boolean=} opt_silent Unset without triggering an event.
- * @api
- */
-BaseObject.prototype.unset = function(key, opt_silent) {
-  if (key in this.values_) {
-    const oldValue = this.values_[key];
-    delete this.values_[key];
-    if (!opt_silent) {
-      this.notify(key, oldValue);
-    }
-  }
-};
-
-
 export default BaseObject;

src/ol/Observable.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/Observable
  */
-import {inherits} from './util.js';
 import {listen, unlistenByKey, unlisten, listenOnce} from './events.js';
 import EventTarget from './events/EventTarget.js';
 import EventType from './events/EventType.js';
@@ -14,15 +13,13 @@ import EventType from './events/EventType.js';
  * and unregistration. A generic `change` event is always available through
  * {@link module:ol/Observable~Observable#changed}.
  *
- * @constructor
- * @extends {module:ol/events/EventTarget}
  * @fires module:ol/events/Event~Event
- * @struct
  * @api
  */
-const Observable = function() {
+class Observable extends EventTarget {
+  constructor() {
 
-  EventTarget.call(this);
+    super();
 
     /**
      * @private
@@ -30,9 +27,88 @@ const Observable = function() {
      */
     this.revision_ = 0;
 
-};
+  }
 
-inherits(Observable, EventTarget);
+  /**
+   * Increases the revision counter and dispatches a 'change' event.
+   * @api
+   */
+  changed() {
+    ++this.revision_;
+    this.dispatchEvent(EventType.CHANGE);
+  }
+
+  /**
+   * Get the version number for this object.  Each time the object is modified,
+   * its version number will be incremented.
+   * @return {number} Revision.
+   * @api
+   */
+  getRevision() {
+    return this.revision_;
+  }
+
+  /**
+   * Listen for a certain type of event.
+   * @param {string|Array.<string>} type The event type or array of event types.
+   * @param {function(?): ?} listener The listener function.
+   * @return {module:ol/events~EventsKey|Array.<module:ol/events~EventsKey>} Unique key for the listener. If
+   *     called with an array of event types as the first argument, the return
+   *     will be an array of keys.
+   * @api
+   */
+  on(type, listener) {
+    if (Array.isArray(type)) {
+      const len = type.length;
+      const keys = new Array(len);
+      for (let i = 0; i < len; ++i) {
+        keys[i] = listen(this, type[i], listener);
+      }
+      return keys;
+    } else {
+      return listen(this, /** @type {string} */ (type), listener);
+    }
+  }
+
+  /**
+   * Listen once for a certain type of event.
+   * @param {string|Array.<string>} type The event type or array of event types.
+   * @param {function(?): ?} listener The listener function.
+   * @return {module:ol/events~EventsKey|Array.<module:ol/events~EventsKey>} Unique key for the listener. If
+   *     called with an array of event types as the first argument, the return
+   *     will be an array of keys.
+   * @api
+   */
+  once(type, listener) {
+    if (Array.isArray(type)) {
+      const len = type.length;
+      const keys = new Array(len);
+      for (let i = 0; i < len; ++i) {
+        keys[i] = listenOnce(this, type[i], listener);
+      }
+      return keys;
+    } else {
+      return listenOnce(this, /** @type {string} */ (type), listener);
+    }
+  }
+
+  /**
+   * Unlisten for a certain type of event.
+   * @param {string|Array.<string>} type The event type or array of event types.
+   * @param {function(?): ?} listener The listener function.
+   * @api
+   */
+  un(type, listener) {
+    if (Array.isArray(type)) {
+      for (let i = 0, ii = type.length; i < ii; ++i) {
+        unlisten(this, type[i], listener);
+      }
+      return;
+    } else {
+      unlisten(this, /** @type {string} */ (type), listener);
+    }
+  }
+}
 
 
 /**
@@ -52,101 +128,4 @@ export function unByKey(key) {
 }
 
 
-/**
- * Increases the revision counter and dispatches a 'change' event.
- * @api
- */
-Observable.prototype.changed = function() {
-  ++this.revision_;
-  this.dispatchEvent(EventType.CHANGE);
-};
-
-
-/**
- * Dispatches an event and calls all listeners listening for events
- * of this type. The event parameter can either be a string or an
- * Object with a `type` property.
- *
- * @param {{type: string,
- *     target: (EventTarget|module:ol/events/EventTarget|undefined)}|
- *     module:ol/events/Event|string} event Event object.
- * @function
- * @api
- */
-Observable.prototype.dispatchEvent;
-
-
-/**
- * Get the version number for this object.  Each time the object is modified,
- * its version number will be incremented.
- * @return {number} Revision.
- * @api
- */
-Observable.prototype.getRevision = function() {
-  return this.revision_;
-};
-
-
-/**
- * Listen for a certain type of event.
- * @param {string|Array.<string>} type The event type or array of event types.
- * @param {function(?): ?} listener The listener function.
- * @return {module:ol/events~EventsKey|Array.<module:ol/events~EventsKey>} Unique key for the listener. If
- *     called with an array of event types as the first argument, the return
- *     will be an array of keys.
- * @api
- */
-Observable.prototype.on = function(type, listener) {
-  if (Array.isArray(type)) {
-    const len = type.length;
-    const keys = new Array(len);
-    for (let i = 0; i < len; ++i) {
-      keys[i] = listen(this, type[i], listener);
-    }
-    return keys;
-  } else {
-    return listen(this, /** @type {string} */ (type), listener);
-  }
-};
-
-
-/**
- * Listen once for a certain type of event.
- * @param {string|Array.<string>} type The event type or array of event types.
- * @param {function(?): ?} listener The listener function.
- * @return {module:ol/events~EventsKey|Array.<module:ol/events~EventsKey>} Unique key for the listener. If
- *     called with an array of event types as the first argument, the return
- *     will be an array of keys.
- * @api
- */
-Observable.prototype.once = function(type, listener) {
-  if (Array.isArray(type)) {
-    const len = type.length;
-    const keys = new Array(len);
-    for (let i = 0; i < len; ++i) {
-      keys[i] = listenOnce(this, type[i], listener);
-    }
-    return keys;
-  } else {
-    return listenOnce(this, /** @type {string} */ (type), listener);
-  }
-};
-
-
-/**
- * Unlisten for a certain type of event.
- * @param {string|Array.<string>} type The event type or array of event types.
- * @param {function(?): ?} listener The listener function.
- * @api
- */
-Observable.prototype.un = function(type, listener) {
-  if (Array.isArray(type)) {
-    for (let i = 0, ii = type.length; i < ii; ++i) {
-      unlisten(this, type[i], listener);
-    }
-    return;
-  } else {
-    unlisten(this, /** @type {string} */ (type), listener);
-  }
-};
 export default Observable;

src/ol/Overlay.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/Overlay
  */
-import {inherits} from './util.js';
 import MapEventType from './MapEventType.js';
 import BaseObject, {getChangeEventType} from './Object.js';
 import OverlayPositioning from './OverlayPositioning.js';
@@ -15,7 +14,7 @@ import {containsExtent} from './extent.js';
  * @typedef {Object} Options
  * @property {number|string} [id] Set the overlay id. The overlay id can be used
  * with the {@link module:ol/Map~Map#getOverlayById} method.
- * @property {Element} [element] The overlay element.
+ * @property {HTMLElement} [element] The overlay element.
  * @property {Array.<number>} [offset=[0, 0]] Offsets in pixels used when positioning
  * the overlay. The first element in the
  * array is the horizontal offset. A positive value shifts the overlay right.
@@ -93,14 +92,16 @@ const Property = {
  *     popup.setPosition(coordinate);
  *     map.addOverlay(popup);
  *
- * @constructor
- * @extends {module:ol/Object}
- * @param {module:ol/Overlay~Options} options Overlay options.
  * @api
  */
-const Overlay = function(options) {
+class Overlay extends BaseObject {
 
-  BaseObject.call(this);
+  /**
+   * @param {module:ol/Overlay~Options} options Overlay options.
+   */
+  constructor(options) {
+
+    super();
 
     /**
      * @protected
@@ -129,7 +130,7 @@ const Overlay = function(options) {
 
     /**
      * @protected
-   * @type {Element}
+     * @type {HTMLElement}
      */
     this.element = document.createElement('DIV');
     this.element.className = options.className !== undefined ?
@@ -211,101 +212,91 @@ const Overlay = function(options) {
       this.setPosition(options.position);
     }
 
-};
+  }
 
-inherits(Overlay, BaseObject);
-
-
-/**
+  /**
    * Get the DOM element of this overlay.
- * @return {Element|undefined} The Element containing the overlay.
+   * @return {HTMLElement|undefined} The Element containing the overlay.
    * @observable
    * @api
    */
-Overlay.prototype.getElement = function() {
-  return /** @type {Element|undefined} */ (this.get(Property.ELEMENT));
-};
+  getElement() {
+    return /** @type {HTMLElement|undefined} */ (this.get(Property.ELEMENT));
+  }
 
-
-/**
+  /**
    * Get the overlay identifier which is set on constructor.
    * @return {number|string|undefined} Id.
    * @api
    */
-Overlay.prototype.getId = function() {
+  getId() {
     return this.id;
-};
+  }
 
-
-/**
+  /**
    * Get the map associated with this overlay.
    * @return {module:ol/PluggableMap|undefined} The map that the
    * overlay is part of.
    * @observable
    * @api
    */
-Overlay.prototype.getMap = function() {
+  getMap() {
     return (
       /** @type {module:ol/PluggableMap|undefined} */ (this.get(Property.MAP))
     );
-};
+  }
 
-
-/**
+  /**
    * Get the offset of this overlay.
    * @return {Array.<number>} The offset.
    * @observable
    * @api
    */
-Overlay.prototype.getOffset = function() {
+  getOffset() {
     return /** @type {Array.<number>} */ (this.get(Property.OFFSET));
-};
+  }
 
-
-/**
+  /**
    * Get the current position of this overlay.
    * @return {module:ol/coordinate~Coordinate|undefined} The spatial point that the overlay is
    *     anchored at.
    * @observable
    * @api
    */
-Overlay.prototype.getPosition = function() {
+  getPosition() {
     return (
       /** @type {module:ol/coordinate~Coordinate|undefined} */ (this.get(Property.POSITION))
     );
-};
+  }
 
-
-/**
+  /**
    * Get the current positioning of this overlay.
    * @return {module:ol/OverlayPositioning} How the overlay is positioned
    *     relative to its point on the map.
    * @observable
    * @api
    */
-Overlay.prototype.getPositioning = function() {
+  getPositioning() {
     return (
       /** @type {module:ol/OverlayPositioning} */ (this.get(Property.POSITIONING))
     );
-};
+  }
 
-
-/**
+  /**
    * @protected
    */
-Overlay.prototype.handleElementChanged = function() {
+  handleElementChanged() {
     removeChildren(this.element);
     const element = this.getElement();
     if (element) {
       this.element.appendChild(element);
     }
-};
+  }
 
-
-/**
+  /**
    * @protected
    */
-Overlay.prototype.handleMapChanged = function() {
+  handleMapChanged() {
     if (this.mapPostrenderListenerKey) {
       removeNode(this.element);
       unlistenByKey(this.mapPostrenderListenerKey);
@@ -324,79 +315,71 @@ Overlay.prototype.handleMapChanged = function() {
         container.appendChild(this.element);
       }
     }
-};
+  }
 
-
-/**
+  /**
    * @protected
    */
-Overlay.prototype.render = function() {
+  render() {
     this.updatePixelPosition();
-};
+  }
 
-
-/**
+  /**
    * @protected
    */
-Overlay.prototype.handleOffsetChanged = function() {
+  handleOffsetChanged() {
     this.updatePixelPosition();
-};
+  }
 
-
-/**
+  /**
    * @protected
    */
-Overlay.prototype.handlePositionChanged = function() {
+  handlePositionChanged() {
     this.updatePixelPosition();
     if (this.get(Property.POSITION) && this.autoPan) {
       this.panIntoView();
     }
-};
+  }
 
-
-/**
+  /**
    * @protected
    */
-Overlay.prototype.handlePositioningChanged = function() {
+  handlePositioningChanged() {
     this.updatePixelPosition();
-};
+  }
 
-
-/**
+  /**
    * Set the DOM element to be associated with this overlay.
- * @param {Element|undefined} element The Element containing the overlay.
+   * @param {HTMLElement|undefined} element The Element containing the overlay.
    * @observable
    * @api
    */
-Overlay.prototype.setElement = function(element) {
+  setElement(element) {
     this.set(Property.ELEMENT, element);
-};
+  }
 
-
-/**
+  /**
    * Set the map to be associated with this overlay.
    * @param {module:ol/PluggableMap|undefined} map The map that the
    * overlay is part of.
    * @observable
    * @api
    */
-Overlay.prototype.setMap = function(map) {
+  setMap(map) {
     this.set(Property.MAP, map);
-};
+  }
 
-
-/**
+  /**
    * Set the offset for this overlay.
    * @param {Array.<number>} offset Offset.
    * @observable
    * @api
    */
-Overlay.prototype.setOffset = function(offset) {
+  setOffset(offset) {
     this.set(Property.OFFSET, offset);
-};
+  }
 
-
-/**
+  /**
    * Set the position for this overlay. If the position is `undefined` the
    * overlay is hidden.
    * @param {module:ol/coordinate~Coordinate|undefined} position The spatial point that the overlay
@@ -404,17 +387,16 @@ Overlay.prototype.setOffset = function(offset) {
    * @observable
    * @api
    */
-Overlay.prototype.setPosition = function(position) {
+  setPosition(position) {
     this.set(Property.POSITION, position);
-};
+  }
 
-
-/**
+  /**
    * Pan the map so that the overlay is entirely visible in the current viewport
    * (if necessary).
    * @protected
    */
-Overlay.prototype.panIntoView = function() {
+  panIntoView() {
     const map = this.getMap();
 
     if (!map || !map.getTargetElement()) {
@@ -422,7 +404,7 @@ Overlay.prototype.panIntoView = function() {
     }
 
     const mapRect = this.getRect(map.getTargetElement(), map.getSize());
-  const element = /** @type {!Element} */ (this.getElement());
+    const element = this.getElement();
     const overlayRect = this.getRect(element, [outerWidth(element), outerHeight(element)]);
 
     const margin = this.autoPanMargin;
@@ -464,17 +446,16 @@ Overlay.prototype.panIntoView = function() {
         });
       }
     }
-};
+  }
 
-
-/**
+  /**
    * Get the extent of an element relative to the document
- * @param {Element|undefined} element The element.
+   * @param {HTMLElement|undefined} element The element.
    * @param {module:ol/size~Size|undefined} size The size of the element.
    * @return {module:ol/extent~Extent} The extent.
    * @protected
    */
-Overlay.prototype.getRect = function(element, size) {
+  getRect(element, size) {
     const box = element.getBoundingClientRect();
     const offsetX = box.left + window.pageXOffset;
     const offsetY = box.top + window.pageYOffset;
@@ -484,39 +465,36 @@ Overlay.prototype.getRect = function(element, size) {
       offsetX + size[0],
       offsetY + size[1]
     ];
-};
+  }
 
-
-/**
+  /**
    * Set the positioning for this overlay.
    * @param {module:ol/OverlayPositioning} positioning how the overlay is
    *     positioned relative to its point on the map.
    * @observable
    * @api
    */
-Overlay.prototype.setPositioning = function(positioning) {
+  setPositioning(positioning) {
     this.set(Property.POSITIONING, positioning);
-};
+  }
 
-
-/**
+  /**
    * Modify the visibility of the element.
    * @param {boolean} visible Element visibility.
    * @protected
    */
-Overlay.prototype.setVisible = function(visible) {
+  setVisible(visible) {
     if (this.rendered.visible !== visible) {
       this.element.style.display = visible ? '' : 'none';
       this.rendered.visible = visible;
     }
-};
+  }
 
-
-/**
+  /**
    * Update pixel position.
    * @protected
    */
-Overlay.prototype.updatePixelPosition = function() {
+  updatePixelPosition() {
     const map = this.getMap();
     const position = this.getPosition();
     if (!map || !map.isRendered() || !position) {
@@ -527,15 +505,14 @@ Overlay.prototype.updatePixelPosition = function() {
     const pixel = map.getPixelFromCoordinate(position);
     const mapSize = map.getSize();
     this.updateRenderedPosition(pixel, mapSize);
-};
+  }
 
-
-/**
- * @param {module:ol~Pixel} pixel The pixel location.
+  /**
+   * @param {module:ol/pixel~Pixel} pixel The pixel location.
    * @param {module:ol/size~Size|undefined} mapSize The map size.
    * @protected
    */
-Overlay.prototype.updateRenderedPosition = function(pixel, mapSize) {
+  updateRenderedPosition(pixel, mapSize) {
     const style = this.element.style;
     const offset = this.getOffset();
 
@@ -593,15 +570,16 @@ Overlay.prototype.updateRenderedPosition = function(pixel, mapSize) {
         this.rendered.top_ = style.top = top;
       }
     }
-};
+  }
 
-
-/**
+  /**
    * returns the options this Overlay has been created with
    * @return {module:ol/Overlay~Options} overlay options
    */
-Overlay.prototype.getOptions = function() {
+  getOptions() {
     return this.options;
-};
+  }
+}
+
 
 export default Overlay;

src/ol/PluggableMap.js

@@ -1,7 +1,7 @@
 /**
  * @module ol/PluggableMap
  */
-import {getUid, inherits} from './util.js';
+import {getUid} from './util.js';
 import Collection from './Collection.js';
 import CollectionEventType from './CollectionEventType.js';
 import MapBrowserEvent from './MapBrowserEvent.js';
@@ -76,7 +76,7 @@ import {create as createTransform, apply as applyTransform} from './transform.js
  * @typedef {Object} MapOptionsInternal
  * @property {module:ol/Collection.<module:ol/control/Control>} [controls]
  * @property {module:ol/Collection.<module:ol/interaction/Interaction>} [interactions]
- * @property {Element|Document} keyboardEventTarget
+ * @property {HTMLElement|Document} keyboardEventTarget
  * @property {module:ol/Collection.<module:ol/Overlay>} overlays
  * @property {Object.<string, *>} values
  */
@@ -93,7 +93,7 @@ import {create as createTransform, apply as applyTransform} from './transform.js
  * @property {module:ol/Collection.<module:ol/interaction/Interaction>|Array.<module:ol/interaction/Interaction>} [interactions]
  * Interactions that are initially added to the map. If not specified,
  * {@link module:ol/interaction~defaults} is used.
- * @property {Element|Document|string} [keyboardEventTarget] The element to
+ * @property {HTMLElement|Document|string} [keyboardEventTarget] The element to
  * listen to keyboard events on. This determines when the `KeyboardPan` and
  * `KeyboardZoom` interactions trigger. For example, if this option is set to
  * `document` the keyboard interactions will always trigger. If this option is
@@ -120,7 +120,7 @@ import {create as createTransform, apply as applyTransform} from './transform.js
  * Increasing this value can make it easier to click on the map.
  * @property {module:ol/Collection.<module:ol/Overlay>|Array.<module:ol/Overlay>} [overlays]
  * Overlays initially added to the map. By default, no overlays are added.
- * @property {Element|string} [target] The container for the map, either the
+ * @property {HTMLElement|string} [target] The container for the map, either the
  * element itself or the `id` of the element. If not specified at construction
  * time, {@link module:ol/Map~Map#setTarget} must be called for the map to be
  * rendered.
@@ -131,18 +131,20 @@ import {create as createTransform, apply as applyTransform} from './transform.js
 
 
 /**
- * @constructor
- * @extends {module:ol/Object}
- * @param {module:ol/PluggableMap~MapOptions} options Map options.
  * @fires module:ol/MapBrowserEvent~MapBrowserEvent
  * @fires module:ol/MapEvent~MapEvent
  * @fires module:ol/render/Event~RenderEvent#postcompose
  * @fires module:ol/render/Event~RenderEvent#precompose
  * @api
  */
-const PluggableMap = function(options) {
+class PluggableMap extends BaseObject {
 
-  BaseObject.call(this);
+  /**
+   * @param {module:ol/PluggableMap~MapOptions} options Map options.
+   */
+  constructor(options) {
+
+    super();
 
     const optionsInternal = createOptionsInternal(options);
 
@@ -240,7 +242,7 @@ const PluggableMap = function(options) {
 
     /**
      * @private
-   * @type {Element}
+     * @type {!HTMLElement}
      */
     this.viewport_ = document.createElement('DIV');
     this.viewport_.className = 'ol-viewport' + (TOUCH ? ' ol-touch' : '');
@@ -254,7 +256,7 @@ const PluggableMap = function(options) {
 
     /**
      * @private
-   * @type {!Element}
+     * @type {!HTMLElement}
      */
     this.overlayContainer_ = document.createElement('DIV');
     this.overlayContainer_.className = 'ol-overlaycontainer';
@@ -262,7 +264,7 @@ const PluggableMap = function(options) {
 
     /**
      * @private
-   * @type {!Element}
+     * @type {!HTMLElement}
      */
     this.overlayContainerStopEvent_ = document.createElement('DIV');
     this.overlayContainerStopEvent_.className = 'ol-overlaycontainer-stopevent';
@@ -293,7 +295,7 @@ const PluggableMap = function(options) {
 
     /**
      * @private
-   * @type {Element|Document}
+     * @type {HTMLElement|Document}
      */
     this.keyboardEventTarget_ = optionsInternal.keyboardEventTarget;
 
@@ -458,78 +460,69 @@ const PluggableMap = function(options) {
         event.element.setMap(null);
       }, this);
 
-};
+  }
 
-inherits(PluggableMap, BaseObject);
-
-
-PluggableMap.prototype.createRenderer = function() {
+  createRenderer() {
     throw new Error('Use a map type that has a createRenderer method');
-};
+  }
 
-
-/**
+  /**
    * Add the given control to the map.
    * @param {module:ol/control/Control} control Control.
    * @api
    */
-PluggableMap.prototype.addControl = function(control) {
+  addControl(control) {
     this.getControls().push(control);
-};
+  }
 
-
-/**
+  /**
    * Add the given interaction to the map.
    * @param {module:ol/interaction/Interaction} interaction Interaction to add.
    * @api
    */
-PluggableMap.prototype.addInteraction = function(interaction) {
+  addInteraction(interaction) {
     this.getInteractions().push(interaction);
-};
+  }
 
-
-/**
+  /**
    * Adds the given layer to the top of this map. If you want to add a layer
    * elsewhere in the stack, use `getLayers()` and the methods available on
    * {@link module:ol/Collection~Collection}.
    * @param {module:ol/layer/Base} layer Layer.
    * @api
    */
-PluggableMap.prototype.addLayer = function(layer) {
+  addLayer(layer) {
     const layers = this.getLayerGroup().getLayers();
     layers.push(layer);
-};
+  }
 
-
-/**
+  /**
    * Add the given overlay to the map.
    * @param {module:ol/Overlay} overlay Overlay.
    * @api
    */
-PluggableMap.prototype.addOverlay = function(overlay) {
+  addOverlay(overlay) {
     this.getOverlays().push(overlay);
-};
+  }
 
-
-/**
+  /**
    * This deals with map's overlay collection changes.
    * @param {module:ol/Overlay} overlay Overlay.
    * @private
    */
-PluggableMap.prototype.addOverlayInternal_ = function(overlay) {
+  addOverlayInternal_(overlay) {
     const id = overlay.getId();
     if (id !== undefined) {
       this.overlayIdIndex_[id.toString()] = overlay;
     }
     overlay.setMap(this);
-};
+  }
 
-
-/**
+  /**
    *
    * @inheritDoc
    */
-PluggableMap.prototype.disposeInternal = function() {
+  disposeInternal() {
     this.mapBrowserEventHandler_.dispose();
     unlisten(this.viewport_, EventType.CONTEXTMENU, this.handleBrowserEvent, this);
     unlisten(this.viewport_, EventType.WHEEL, this.handleBrowserEvent, this);
@@ -543,15 +536,14 @@ PluggableMap.prototype.disposeInternal = function() {
       this.animationDelayKey_ = undefined;
     }
     this.setTarget(null);
-  BaseObject.prototype.disposeInternal.call(this);
-};
+    super.disposeInternal();
+  }
 
-
-/**
+  /**
    * Detect features that intersect a pixel on the viewport, and execute a
    * callback with each intersecting feature. Layers included in the detection can
    * be configured through the `layerFilter` option in `opt_options`.
- * @param {module:ol~Pixel} pixel Pixel.
+   * @param {module:ol/pixel~Pixel} pixel Pixel.
    * @param {function(this: S, (module:ol/Feature|module:ol/render/Feature),
    *     module:ol/layer/Layer): T} callback Feature callback. The callback will be
    *     called with two arguments. The first argument is one
@@ -566,7 +558,7 @@ PluggableMap.prototype.disposeInternal = function() {
    * @template S,T
    * @api
    */
-PluggableMap.prototype.forEachFeatureAtPixel = function(pixel, callback, opt_options) {
+  forEachFeatureAtPixel(pixel, callback, opt_options) {
     if (!this.frameState_) {
       return;
     }
@@ -579,18 +571,17 @@ PluggableMap.prototype.forEachFeatureAtPixel = function(pixel, callback, opt_opt
     return this.renderer_.forEachFeatureAtCoordinate(
       coordinate, this.frameState_, hitTolerance, callback, null,
       layerFilter, null);
-};
+  }
 
-
-/**
+  /**
    * Get all features that intersect a pixel on the viewport.
- * @param {module:ol~Pixel} pixel Pixel.
+   * @param {module:ol/pixel~Pixel} pixel Pixel.
    * @param {module:ol/PluggableMap~AtPixelOptions=} opt_options Optional options.
    * @return {Array.<module:ol/Feature|module:ol/render/Feature>} The detected features or
    * `null` if none were found.
    * @api
    */
-PluggableMap.prototype.getFeaturesAtPixel = function(pixel, opt_options) {
+  getFeaturesAtPixel(pixel, opt_options) {
     let features = null;
     this.forEachFeatureAtPixel(pixel, function(feature) {
       if (!features) {
@@ -599,13 +590,13 @@ PluggableMap.prototype.getFeaturesAtPixel = function(pixel, opt_options) {
       features.push(feature);
     }, opt_options);
     return features;
-};
+  }
 
-/**
+  /**
    * Detect layers that have a color value at a pixel on the viewport, and
    * execute a callback with each matching layer. Layers included in the
    * detection can be configured through `opt_layerFilter`.
- * @param {module:ol~Pixel} pixel Pixel.
+   * @param {module:ol/pixel~Pixel} pixel Pixel.
    * @param {function(this: S, module:ol/layer/Layer, (Uint8ClampedArray|Uint8Array)): T} callback
    *     Layer callback. This callback will receive two arguments: first is the
    *     {@link module:ol/layer/Layer layer}, second argument is an array representing
@@ -618,7 +609,7 @@ PluggableMap.prototype.getFeaturesAtPixel = function(pixel, opt_options) {
    * @template S,T
    * @api
    */
-PluggableMap.prototype.forEachLayerAtPixel = function(pixel, callback, opt_options) {
+  forEachLayerAtPixel(pixel, callback, opt_options) {
     if (!this.frameState_) {
       return;
     }
@@ -628,19 +619,18 @@ PluggableMap.prototype.forEachLayerAtPixel = function(pixel, callback, opt_optio
     const layerFilter = options.layerFilter || TRUE;
     return this.renderer_.forEachLayerAtPixel(
       pixel, this.frameState_, hitTolerance, callback, null, layerFilter, null);
-};
+  }
 
-
-/**
+  /**
    * Detect if features intersect a pixel on the viewport. Layers included in the
    * detection can be configured through `opt_layerFilter`.
- * @param {module:ol~Pixel} pixel Pixel.
+   * @param {module:ol/pixel~Pixel} pixel Pixel.
    * @param {module:ol/PluggableMap~AtPixelOptions=} opt_options Optional options.
    * @return {boolean} Is there a feature at the given pixel?
    * @template U
    * @api
    */
-PluggableMap.prototype.hasFeatureAtPixel = function(pixel, opt_options) {
+  hasFeatureAtPixel(pixel, opt_options) {
     if (!this.frameState_) {
       return false;
     }
@@ -651,107 +641,99 @@ PluggableMap.prototype.hasFeatureAtPixel = function(pixel, opt_options) {
       opt_options.hitTolerance * this.frameState_.pixelRatio : 0;
     return this.renderer_.hasFeatureAtCoordinate(
       coordinate, this.frameState_, hitTolerance, layerFilter, null);
-};
+  }
 
-
-/**
+  /**
    * Returns the coordinate in view projection for a browser event.
    * @param {Event} event Event.
    * @return {module:ol/coordinate~Coordinate} Coordinate.
    * @api
    */
-PluggableMap.prototype.getEventCoordinate = function(event) {
+  getEventCoordinate(event) {
     return this.getCoordinateFromPixel(this.getEventPixel(event));
-};
+  }
 
-
-/**
+  /**
    * Returns the map pixel position for a browser event relative to the viewport.
    * @param {Event} event Event.
- * @return {module:ol~Pixel} Pixel.
+   * @return {module:ol/pixel~Pixel} Pixel.
    * @api
    */
-PluggableMap.prototype.getEventPixel = function(event) {
+  getEventPixel(event) {
     const viewportPosition = this.viewport_.getBoundingClientRect();
     const eventPosition = event.changedTouches ? event.changedTouches[0] : event;
     return [
       eventPosition.clientX - viewportPosition.left,
       eventPosition.clientY - viewportPosition.top
     ];
-};
+  }
 
-
-/**
+  /**
    * Get the target in which this map is rendered.
    * Note that this returns what is entered as an option or in setTarget:
    * if that was an element, it returns an element; if a string, it returns that.
- * @return {Element|string|undefined} The Element or id of the Element that the
+   * @return {HTMLElement|string|undefined} The Element or id of the Element that the
    *     map is rendered in.
    * @observable
    * @api
    */
-PluggableMap.prototype.getTarget = function() {
-  return /** @type {Element|string|undefined} */ (this.get(MapProperty.TARGET));
-};
+  getTarget() {
+    return /** @type {HTMLElement|string|undefined} */ (this.get(MapProperty.TARGET));
+  }
 
-
-/**
+  /**
    * Get the DOM element into which this map is rendered. In contrast to
    * `getTarget` this method always return an `Element`, or `null` if the
    * map has no target.
- * @return {Element} The element that the map is rendered in.
+   * @return {HTMLElement} The element that the map is rendered in.
    * @api
    */
-PluggableMap.prototype.getTargetElement = function() {
+  getTargetElement() {
     const target = this.getTarget();
     if (target !== undefined) {
       return typeof target === 'string' ? document.getElementById(target) : target;
     } else {
       return null;
     }
-};
+  }
 
-
-/**
+  /**
    * Get the coordinate for a given pixel.  This returns a coordinate in the
    * map view projection.
- * @param {module:ol~Pixel} pixel Pixel position in the map viewport.
+   * @param {module:ol/pixel~Pixel} pixel Pixel position in the map viewport.
    * @return {module:ol/coordinate~Coordinate} The coordinate for the pixel position.
    * @api
    */
-PluggableMap.prototype.getCoordinateFromPixel = function(pixel) {
+  getCoordinateFromPixel(pixel) {
     const frameState = this.frameState_;
     if (!frameState) {
       return null;
     } else {
       return applyTransform(frameState.pixelToCoordinateTransform, pixel.slice());
     }
-};
+  }
 
-
-/**
+  /**
    * Get the map controls. Modifying this collection changes the controls
    * associated with the map.
    * @return {module:ol/Collection.<module:ol/control/Control>} Controls.
    * @api
    */
-PluggableMap.prototype.getControls = function() {
+  getControls() {
     return this.controls;
-};
+  }
 
-
-/**
+  /**
    * Get the map overlays. Modifying this collection changes the overlays
    * associated with the map.
    * @return {module:ol/Collection.<module:ol/Overlay>} Overlays.
    * @api
    */
-PluggableMap.prototype.getOverlays = function() {
+  getOverlays() {
     return this.overlays_;
-};
+  }
 
-
-/**
+  /**
    * Get an overlay by its identifier (the value returned by overlay.getId()).
    * Note that the index treats string and numeric identifiers as the same. So
    * `map.getOverlayById(2)` will return an overlay with id `'2'` or `2`.
@@ -759,13 +741,12 @@ PluggableMap.prototype.getOverlays = function() {
    * @return {module:ol/Overlay} Overlay.
    * @api
    */
-PluggableMap.prototype.getOverlayById = function(id) {
+  getOverlayById(id) {
     const overlay = this.overlayIdIndex_[id.toString()];
     return overlay !== undefined ? overlay : null;
-};
+  }
 
-
-/**
+  /**
    * Get the map interactions. Modifying this collection changes the interactions
    * associated with the map.
    *
@@ -773,130 +754,120 @@ PluggableMap.prototype.getOverlayById = function(id) {
    * @return {module:ol/Collection.<module:ol/interaction/Interaction>} Interactions.
    * @api
    */
-PluggableMap.prototype.getInteractions = function() {
+  getInteractions() {
     return this.interactions;
-};
+  }
 
-
-/**
+  /**
    * Get the layergroup associated with this map.
    * @return {module:ol/layer/Group} A layer group containing the layers in this map.
    * @observable
    * @api
    */
-PluggableMap.prototype.getLayerGroup = function() {
+  getLayerGroup() {
     return (
       /** @type {module:ol/layer/Group} */ (this.get(MapProperty.LAYERGROUP))
     );
-};
+  }
 
-
-/**
+  /**
    * Get the collection of layers associated with this map.
    * @return {!module:ol/Collection.<module:ol/layer/Base>} Layers.
    * @api
    */
-PluggableMap.prototype.getLayers = function() {
+  getLayers() {
     const layers = this.getLayerGroup().getLayers();
     return layers;
-};
+  }
 
-
-/**
+  /**
    * Get the pixel for a coordinate.  This takes a coordinate in the map view
    * projection and returns the corresponding pixel.
    * @param {module:ol/coordinate~Coordinate} coordinate A map coordinate.
- * @return {module:ol~Pixel} A pixel position in the map viewport.
+   * @return {module:ol/pixel~Pixel} A pixel position in the map viewport.
    * @api
    */
-PluggableMap.prototype.getPixelFromCoordinate = function(coordinate) {
+  getPixelFromCoordinate(coordinate) {
     const frameState = this.frameState_;
     if (!frameState) {
       return null;
     } else {
       return applyTransform(frameState.coordinateToPixelTransform, coordinate.slice(0, 2));
     }
-};
+  }
 
-
-/**
+  /**
    * Get the map renderer.
    * @return {module:ol/renderer/Map} Renderer
    */
-PluggableMap.prototype.getRenderer = function() {
+  getRenderer() {
     return this.renderer_;
-};
+  }
 
-
-/**
+  /**
    * Get the size of this map.
    * @return {module:ol/size~Size|undefined} The size in pixels of the map in the DOM.
    * @observable
    * @api
    */
-PluggableMap.prototype.getSize = function() {
+  getSize() {
     return (
       /** @type {module:ol/size~Size|undefined} */ (this.get(MapProperty.SIZE))
     );
-};
+  }
 
-
-/**
+  /**
    * Get the view associated with this map. A view manages properties such as
    * center and resolution.
    * @return {module:ol/View} The view that controls this map.
    * @observable
    * @api
    */
-PluggableMap.prototype.getView = function() {
+  getView() {
     return (
       /** @type {module:ol/View} */ (this.get(MapProperty.VIEW))
     );
-};
+  }
 
-
-/**
+  /**
    * Get the element that serves as the map viewport.
- * @return {Element} Viewport.
+   * @return {HTMLElement} Viewport.
    * @api
    */
-PluggableMap.prototype.getViewport = function() {
+  getViewport() {
     return this.viewport_;
-};
+  }
 
-
-/**
+  /**
    * Get the element that serves as the container for overlays.  Elements added to
    * this container will let mousedown and touchstart events through to the map,
    * so clicks and gestures on an overlay will trigger {@link module:ol/MapBrowserEvent~MapBrowserEvent}
    * events.
- * @return {!Element} The map's overlay container.
+   * @return {!HTMLElement} The map's overlay container.
    */
-PluggableMap.prototype.getOverlayContainer = function() {
+  getOverlayContainer() {
     return this.overlayContainer_;
-};
+  }
 
-
-/**
+  /**
    * Get the element that serves as a container for overlays that don't allow
    * event propagation. Elements added to this container won't let mousedown and
    * touchstart events through to the map, so clicks and gestures on an overlay
    * don't trigger any {@link module:ol/MapBrowserEvent~MapBrowserEvent}.
- * @return {!Element} The map's overlay container that stops events.
+   * @return {!HTMLElement} The map's overlay container that stops events.
    */
-PluggableMap.prototype.getOverlayContainerStopEvent = function() {
+  getOverlayContainerStopEvent() {
     return this.overlayContainerStopEvent_;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/Tile} tile Tile.
    * @param {string} tileSourceKey Tile source key.
    * @param {module:ol/coordinate~Coordinate} tileCenter Tile center.
    * @param {number} tileResolution Tile resolution.
    * @return {number} Tile priority.
    */
-PluggableMap.prototype.getTilePriority = function(tile, tileSourceKey, tileCenter, tileResolution) {
+  getTilePriority(tile, tileSourceKey, tileCenter, tileResolution) {
     // Filter out tiles at higher zoom levels than the current zoom level, or that
     // are outside the visible extent.
     const frameState = this.frameState_;
@@ -916,24 +887,22 @@ PluggableMap.prototype.getTilePriority = function(tile, tileSourceKey, tileCente
     const deltaY = tileCenter[1] - frameState.focus[1];
     return 65536 * Math.log(tileResolution) +
         Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;
-};
+  }
 
-
-/**
+  /**
    * @param {Event} browserEvent Browser event.
    * @param {string=} opt_type Type.
    */
-PluggableMap.prototype.handleBrowserEvent = function(browserEvent, opt_type) {
+  handleBrowserEvent(browserEvent, opt_type) {
     const type = opt_type || browserEvent.type;
     const mapBrowserEvent = new MapBrowserEvent(type, this, browserEvent);
     this.handleMapBrowserEvent(mapBrowserEvent);
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/MapBrowserEvent} mapBrowserEvent The event to handle.
    */
-PluggableMap.prototype.handleMapBrowserEvent = function(mapBrowserEvent) {
+  handleMapBrowserEvent(mapBrowserEvent) {
     if (!this.frameState_) {
       // With no view defined, we cannot translate pixels into geographical
       // coordinates so interactions cannot be used.
@@ -954,13 +923,12 @@ PluggableMap.prototype.handleMapBrowserEvent = function(mapBrowserEvent) {
         }
       }
     }
-};
+  }
 
-
-/**
+  /**
    * @protected
    */
-PluggableMap.prototype.handlePostRender = function() {
+  handlePostRender() {
 
     const frameState = this.frameState_;
 
@@ -999,21 +967,19 @@ PluggableMap.prototype.handlePostRender = function() {
       postRenderFunctions[i](this, frameState);
     }
     postRenderFunctions.length = 0;
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-PluggableMap.prototype.handleSizeChanged_ = function() {
+  handleSizeChanged_() {
     this.render();
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-PluggableMap.prototype.handleTargetChanged_ = function() {
+  handleTargetChanged_() {
     // target may be undefined, null, a string or an Element.
     // If it's a string we convert it to an Element before proceeding.
     // If it's not now an Element we remove the viewport from the DOM.
@@ -1057,29 +1023,26 @@ PluggableMap.prototype.handleTargetChanged_ = function() {
     this.updateSize();
     // updateSize calls setSize, so no need to call this.render
     // ourselves here.
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-PluggableMap.prototype.handleTileChange_ = function() {
+  handleTileChange_() {
     this.render();
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-PluggableMap.prototype.handleViewPropertyChanged_ = function() {
+  handleViewPropertyChanged_() {
     this.render();
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-PluggableMap.prototype.handleViewChanged_ = function() {
+  handleViewChanged_() {
     if (this.viewPropertyListenerKey_) {
       unlistenByKey(this.viewPropertyListenerKey_);
       this.viewPropertyListenerKey_ = null;
@@ -1099,13 +1062,12 @@ PluggableMap.prototype.handleViewChanged_ = function() {
         this.handleViewPropertyChanged_, this);
     }
     this.render();
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-PluggableMap.prototype.handleLayerGroupChanged_ = function() {
+  handleLayerGroupChanged_() {
     if (this.layerGroupPropertyListenerKeys_) {
       this.layerGroupPropertyListenerKeys_.forEach(unlistenByKey);
       this.layerGroupPropertyListenerKeys_ = null;
@@ -1122,94 +1084,86 @@ PluggableMap.prototype.handleLayerGroupChanged_ = function() {
       ];
     }
     this.render();
-};
+  }
 
-
-/**
+  /**
    * @return {boolean} Is rendered.
    */
-PluggableMap.prototype.isRendered = function() {
+  isRendered() {
     return !!this.frameState_;
-};
+  }
 
-
-/**
+  /**
    * Requests an immediate render in a synchronous manner.
    * @api
    */
-PluggableMap.prototype.renderSync = function() {
+  renderSync() {
     if (this.animationDelayKey_) {
       cancelAnimationFrame(this.animationDelayKey_);
     }
     this.animationDelay_();
-};
+  }
 
-
-/**
+  /**
    * Request a map rendering (at the next animation frame).
    * @api
    */
-PluggableMap.prototype.render = function() {
+  render() {
     if (this.animationDelayKey_ === undefined) {
       this.animationDelayKey_ = requestAnimationFrame(this.animationDelay_);
     }
-};
+  }
 
-
-/**
+  /**
    * Remove the given control from the map.
    * @param {module:ol/control/Control} control Control.
    * @return {module:ol/control/Control|undefined} The removed control (or undefined
    *     if the control was not found).
    * @api
    */
-PluggableMap.prototype.removeControl = function(control) {
+  removeControl(control) {
     return this.getControls().remove(control);
-};
+  }
 
-
-/**
+  /**
    * Remove the given interaction from the map.
    * @param {module:ol/interaction/Interaction} interaction Interaction to remove.
    * @return {module:ol/interaction/Interaction|undefined} The removed interaction (or
    *     undefined if the interaction was not found).
    * @api
    */
-PluggableMap.prototype.removeInteraction = function(interaction) {
+  removeInteraction(interaction) {
     return this.getInteractions().remove(interaction);
-};
+  }
 
-
-/**
+  /**
    * Removes the given layer from the map.
    * @param {module:ol/layer/Base} layer Layer.
    * @return {module:ol/layer/Base|undefined} The removed layer (or undefined if the
    *     layer was not found).
    * @api
    */
-PluggableMap.prototype.removeLayer = function(layer) {
+  removeLayer(layer) {
     const layers = this.getLayerGroup().getLayers();
     return layers.remove(layer);
-};
+  }
 
-
-/**
+  /**
    * Remove the given overlay from the map.
    * @param {module:ol/Overlay} overlay Overlay.
    * @return {module:ol/Overlay|undefined} The removed overlay (or undefined
    *     if the overlay was not found).
    * @api
    */
-PluggableMap.prototype.removeOverlay = function(overlay) {
+  removeOverlay(overlay) {
     return this.getOverlays().remove(overlay);
-};
+  }
 
-
-/**
+  /**
    * @param {number} time Time.
    * @private
    */
-PluggableMap.prototype.renderFrame_ = function(time) {
+  renderFrame_(time) {
     let viewState;
 
     const size = this.getSize();
@@ -1295,70 +1249,64 @@ PluggableMap.prototype.renderFrame_ = function(time) {
 
     setTimeout(this.handlePostRender.bind(this), 0);
 
-};
+  }
 
-
-/**
+  /**
    * Sets the layergroup of this map.
    * @param {module:ol/layer/Group} layerGroup A layer group containing the layers in this map.
    * @observable
    * @api
    */
-PluggableMap.prototype.setLayerGroup = function(layerGroup) {
+  setLayerGroup(layerGroup) {
     this.set(MapProperty.LAYERGROUP, layerGroup);
-};
+  }
 
-
-/**
+  /**
    * Set the size of this map.
    * @param {module:ol/size~Size|undefined} size The size in pixels of the map in the DOM.
    * @observable
    * @api
    */
-PluggableMap.prototype.setSize = function(size) {
+  setSize(size) {
     this.set(MapProperty.SIZE, size);
-};
+  }
 
-
-/**
+  /**
    * Set the target element to render this map into.
- * @param {Element|string|undefined} target The Element or id of the Element
+   * @param {HTMLElement|string|undefined} target The Element or id of the Element
    *     that the map is rendered in.
    * @observable
    * @api
    */
-PluggableMap.prototype.setTarget = function(target) {
+  setTarget(target) {
     this.set(MapProperty.TARGET, target);
-};
+  }
 
-
-/**
+  /**
    * Set the view for this map.
    * @param {module:ol/View} view The view that controls this map.
    * @observable
    * @api
    */
-PluggableMap.prototype.setView = function(view) {
+  setView(view) {
     this.set(MapProperty.VIEW, view);
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/Feature} feature Feature.
    */
-PluggableMap.prototype.skipFeature = function(feature) {
+  skipFeature(feature) {
     const featureUid = getUid(feature).toString();
     this.skippedFeatureUids_[featureUid] = true;
     this.render();
-};
+  }
 
-
-/**
+  /**
    * Force a recalculation of the map viewport size.  This should be called when
    * third-party code changes the size of the map viewport.
    * @api
    */
-PluggableMap.prototype.updateSize = function() {
+  updateSize() {
     const targetElement = this.getTargetElement();
 
     if (!targetElement) {
@@ -1378,17 +1326,17 @@ PluggableMap.prototype.updateSize = function() {
             parseFloat(computedStyle['borderBottomWidth'])
       ]);
     }
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/Feature} feature Feature.
    */
-PluggableMap.prototype.unskipFeature = function(feature) {
+  unskipFeature(feature) {
     const featureUid = getUid(feature).toString();
     delete this.skippedFeatureUids_[featureUid];
     this.render();
-};
+  }
+}
 
 
 /**
@@ -1398,7 +1346,7 @@ PluggableMap.prototype.unskipFeature = function(feature) {
 function createOptionsInternal(options) {
 
   /**
-   * @type {Element|Document}
+   * @type {HTMLElement|Document}
    */
   let keyboardEventTarget = null;
   if (options.keyboardEventTarget !== undefined) {

src/ol/README.md

@@ -1,52 +0,0 @@
-# ol
-
-OpenLayers as ES modules.
-
-## Usage
-
-Add the `ol` package as a dependency to your project.
-
-    npm install ol --save
-
-Import just what you need for your application:
-
-```js
-import Map from 'ol/Map';
-import View from 'ol/View';
-import TileLayer from 'ol/layer/Tile';
-import XYZ from 'ol/source/XYZ';
-
-new Map({
-  target: 'map',
-  layers: [
-    new TileLayer({
-      source: new XYZ({
-        url: 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png'
-      })
-    })
-  ],
-  view: new View({
-    center: [0, 0],
-    zoom: 2
-  })
-});
-```
-
-See the following examples for more detail on bundling OpenLayers with your application:
-
- * Using [Rollup & Uglify](https://gist.github.com/tschaub/8beb328ea72b36446fc2198d008287de)
- * Using [Rollup & Closure Compiler](https://gist.github.com/tschaub/32a5692bedac5254da24fa3b12072f35)
- * Using [Webpack & Uglify](https://gist.github.com/tschaub/79025aef325cd2837364400a105405b8)
- * Using [Webpack & Closure Compiler](https://gist.github.com/ahocevar/8ceafc6293455ba491dd9be12c15761f)
- * Using [Browserify & Uglify](https://gist.github.com/tschaub/4bfb209a8f809823f1495b2e4436018e)
-
-## Module Identifiers
-
-The module identifiers shown in the above snippet (e.g. `ol/Map`, note the CamelCase module name) are default exports of constructors. There are also modules like 'ol/proj' (note the lowercase module name), which provide named exports for utility functions and constants, e.g.
-
-```js
-import {fromLonLat} from 'ol/proj';
-
-map.setCenter(fromLonLat([16, 48]));
-```
-See the [API documentation](http://openlayers.org/en/latest/apidoc/) for a reference of all modules, and just keep in mind: CamelCase modules provide a default export, lowercase modules provide named exports.

src/ol/Tile.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/Tile
  */
-import {inherits} from './util.js';
 import TileState from './TileState.js';
 import {easeIn} from './easing.js';
 import EventTarget from './events/EventTarget.js';
@@ -44,15 +43,17 @@ import EventType from './events/EventType.js';
  * @classdesc
  * Base class for tiles.
  *
- * @constructor
  * @abstract
- * @extends {module:ol/events/EventTarget}
+  */
+class Tile extends EventTarget {
+
+  /**
    * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.
    * @param {module:ol/TileState} state State.
    * @param {module:ol/Tile~Options=} opt_options Tile options.
    */
-const Tile = function(tileCoord, state, opt_options) {
-  EventTarget.call(this);
+  constructor(tileCoord, state, opt_options) {
+    super();
 
     const options = opt_options ? opt_options : {};
 
@@ -96,33 +97,29 @@ const Tile = function(tileCoord, state, opt_options) {
      */
     this.transitionStarts_ = {};
 
-};
+  }
 
-inherits(Tile, EventTarget);
-
-
-/**
+  /**
    * @protected
    */
-Tile.prototype.changed = function() {
+  changed() {
     this.dispatchEvent(EventType.CHANGE);
-};
+  }
 
-
-/**
+  /**
    * @return {string} Key.
    */
-Tile.prototype.getKey = function() {
+  getKey() {
     return this.key + '/' + this.tileCoord;
-};
+  }
 
-/**
+  /**
    * Get the interim tile most suitable for rendering using the chain of interim
    * tiles. This corresponds to the  most recent tile that has been loaded, if no
    * such tile exists, the original tile is returned.
    * @return {!module:ol/Tile} Best tile for rendering.
    */
-Tile.prototype.getInterimTile = function() {
+  getInterimTile() {
     if (!this.interimTile) {
       //empty chain
       return this;
@@ -142,13 +139,13 @@ Tile.prototype.getInterimTile = function() {
 
     // we can not find a better tile
     return this;
-};
+  }
 
-/**
+  /**
    * Goes through the chain of interim tiles and discards sections of the chain
    * that are no longer relevant.
    */
-Tile.prototype.refreshInterimChain = function() {
+  refreshInterimChain() {
     if (!this.interimTile) {
       return;
     }
@@ -176,49 +173,48 @@ Tile.prototype.refreshInterimChain = function() {
       }
       tile = prev.interimTile;
     } while (tile);
-};
+  }
 
-/**
+  /**
    * Get the tile coordinate for this tile.
    * @return {module:ol/tilecoord~TileCoord} The tile coordinate.
    * @api
    */
-Tile.prototype.getTileCoord = function() {
+  getTileCoord() {
     return this.tileCoord;
-};
+  }
 
-
-/**
+  /**
    * @return {module:ol/TileState} State.
    */
-Tile.prototype.getState = function() {
+  getState() {
     return this.state;
-};
+  }
 
-/**
+  /**
    * @param {module:ol/TileState} state State.
    */
-Tile.prototype.setState = function(state) {
+  setState(state) {
     this.state = state;
     this.changed();
-};
+  }
 
-/**
+  /**
    * Load the image or retry if loading previously failed.
    * Loading is taken care of by the tile queue, and calling this method is
    * only needed for preloading or for reloading in case of an error.
    * @abstract
    * @api
    */
-Tile.prototype.load = function() {};
+  load() {}
 
-/**
+  /**
    * Get the alpha value for rendering.
    * @param {number} id An id for the renderer.
    * @param {number} time The render frame time.
    * @return {number} A number between 0 and 1.
    */
-Tile.prototype.getAlpha = function(id, time) {
+  getAlpha(id, time) {
     if (!this.transition_) {
       return 1;
     }
@@ -236,29 +232,32 @@ Tile.prototype.getAlpha = function(id, time) {
       return 1;
     }
     return easeIn(delta / this.transition_);
-};
+  }
 
-/**
+  /**
    * Determine if a tile is in an alpha transition.  A tile is considered in
    * transition if tile.getAlpha() has not yet been called or has been called
    * and returned 1.
    * @param {number} id An id for the renderer.
    * @return {boolean} The tile is in transition.
    */
-Tile.prototype.inTransition = function(id) {
+  inTransition(id) {
     if (!this.transition_) {
       return false;
     }
     return this.transitionStarts_[id] !== -1;
-};
+  }
 
-/**
+  /**
    * Mark a transition as complete.
    * @param {number} id An id for the renderer.
    */
-Tile.prototype.endTransition = function(id) {
+  endTransition(id) {
     if (this.transition_) {
       this.transitionStarts_[id] = -1;
     }
-};
+  }
+}
+
+
 export default Tile;

src/ol/TileCache.js

@@ -1,29 +1,24 @@
 /**
  * @module ol/TileCache
  */
-import {inherits} from './util.js';
 import LRUCache from './structs/LRUCache.js';
 import {fromKey, getKey} from './tilecoord.js';
 
-/**
- * @constructor
- * @extends {module:ol/structs/LRUCache.<module:ol/Tile>}
+class TileCache extends LRUCache {
+
+  /**
    * @param {number=} opt_highWaterMark High water mark.
- * @struct
    */
-const TileCache = function(opt_highWaterMark) {
+  constructor(opt_highWaterMark) {
 
-  LRUCache.call(this, opt_highWaterMark);
+    super(opt_highWaterMark);
 
-};
+  }
 
-inherits(TileCache, LRUCache);
-
-
-/**
+  /**
    * @param {!Object.<string, module:ol/TileRange>} usedTiles Used tiles.
    */
-TileCache.prototype.expireCache = function(usedTiles) {
+  expireCache(usedTiles) {
     while (this.canExpireCache()) {
       const tile = this.peekLast();
       const zKey = tile.tileCoord[0].toString();
@@ -33,13 +28,12 @@ TileCache.prototype.expireCache = function(usedTiles) {
         this.pop().dispose();
       }
     }
-};
+  }
 
-
-/**
+  /**
    * Prune all tiles from the cache that don't have the same z as the newest tile.
    */
-TileCache.prototype.pruneExceptNewestZ = function() {
+  pruneExceptNewestZ() {
     if (this.getCount() === 0) {
       return;
     }
@@ -52,5 +46,8 @@ TileCache.prototype.pruneExceptNewestZ = function() {
         tile.dispose();
       }
     }, this);
-};
+  }
+}
+
+
 export default TileCache;

src/ol/TileQueue.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/TileQueue
  */
-import {inherits} from './util.js';
 import TileState from './TileState.js';
 import {listen, unlisten} from './events.js';
 import EventType from './events/EventType.js';
@@ -13,19 +12,15 @@ import PriorityQueue from './structs/PriorityQueue.js';
  */
 
 
-/**
- * @constructor
- * @extends {module:ol/structs/PriorityQueue.<Array>}
- * @param {module:ol/TileQueue~PriorityFunction} tilePriorityFunction
- *     Tile priority function.
- * @param {function(): ?} tileChangeCallback
- *     Function called on each tile change event.
- * @struct
- */
-const TileQueue = function(tilePriorityFunction, tileChangeCallback) {
+class TileQueue extends PriorityQueue {
 
-  PriorityQueue.call(
-    this,
+  /**
+   * @param {module:ol/TileQueue~PriorityFunction} tilePriorityFunction Tile priority function.
+   * @param {function(): ?} tileChangeCallback Function called on each tile change event.
+   */
+  constructor(tilePriorityFunction, tileChangeCallback) {
+
+    super(
       /**
        * @param {Array} element Element.
        * @return {number} Priority.
@@ -59,37 +54,32 @@ const TileQueue = function(tilePriorityFunction, tileChangeCallback) {
      */
     this.tilesLoadingKeys_ = {};
 
-};
+  }
 
-inherits(TileQueue, PriorityQueue);
-
-
-/**
+  /**
    * @inheritDoc
    */
-TileQueue.prototype.enqueue = function(element) {
-  const added = PriorityQueue.prototype.enqueue.call(this, element);
+  enqueue(element) {
+    const added = super.enqueue(element);
     if (added) {
       const tile = element[0];
       listen(tile, EventType.CHANGE, this.handleTileChange, this);
     }
     return added;
-};
+  }
 
-
-/**
+  /**
    * @return {number} Number of tiles loading.
    */
-TileQueue.prototype.getTilesLoading = function() {
+  getTilesLoading() {
     return this.tilesLoading_;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/events/Event} event Event.
    * @protected
    */
-TileQueue.prototype.handleTileChange = function(event) {
+  handleTileChange(event) {
     const tile = /** @type {module:ol/Tile} */ (event.target);
     const state = tile.getState();
     if (state === TileState.LOADED || state === TileState.ERROR ||
@@ -102,14 +92,13 @@ TileQueue.prototype.handleTileChange = function(event) {
       }
       this.tileChangeCallback_();
     }
-};
+  }
 
-
-/**
+  /**
    * @param {number} maxTotalLoading Maximum number tiles to load simultaneously.
    * @param {number} maxNewLoads Maximum number of new tiles to load.
    */
-TileQueue.prototype.loadMoreTiles = function(maxTotalLoading, maxNewLoads) {
+  loadMoreTiles(maxTotalLoading, maxNewLoads) {
     let newLoads = 0;
     let abortedTiles = false;
     let state, tile, tileKey;
@@ -132,5 +121,8 @@ TileQueue.prototype.loadMoreTiles = function(maxTotalLoading, maxNewLoads) {
       // a small, saturated tile cache.
       this.tileChangeCallback_();
     }
-};
+  }
+}
+
+
 export default TileQueue;

src/ol/TileRange.js

@@ -1,18 +1,20 @@
 /**
  * @module ol/TileRange
  */
+
 /**
  * A representation of a contiguous block of tiles.  A tile range is specified
  * by its min/max tile coordinates and is inclusive of coordinates.
- *
- * @constructor
+ */
+class TileRange {
+
+  /**
    * @param {number} minX Minimum X.
    * @param {number} maxX Maximum X.
    * @param {number} minY Minimum Y.
    * @param {number} maxY Maximum Y.
- * @struct
    */
-const TileRange = function(minX, maxX, minY, maxY) {
+  constructor(minX, maxX, minY, maxY) {
 
     /**
      * @type {number}
@@ -34,7 +36,93 @@ const TileRange = function(minX, maxX, minY, maxY) {
      */
     this.maxY = maxY;
 
-};
+  }
+
+  /**
+   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.
+   * @return {boolean} Contains tile coordinate.
+   */
+  contains(tileCoord) {
+    return this.containsXY(tileCoord[1], tileCoord[2]);
+  }
+
+  /**
+   * @param {module:ol/TileRange} tileRange Tile range.
+   * @return {boolean} Contains.
+   */
+  containsTileRange(tileRange) {
+    return this.minX <= tileRange.minX && tileRange.maxX <= this.maxX &&
+       this.minY <= tileRange.minY && tileRange.maxY <= this.maxY;
+  }
+
+  /**
+   * @param {number} x Tile coordinate x.
+   * @param {number} y Tile coordinate y.
+   * @return {boolean} Contains coordinate.
+   */
+  containsXY(x, y) {
+    return this.minX <= x && x <= this.maxX && this.minY <= y && y <= this.maxY;
+  }
+
+  /**
+   * @param {module:ol/TileRange} tileRange Tile range.
+   * @return {boolean} Equals.
+   */
+  equals(tileRange) {
+    return this.minX == tileRange.minX && this.minY == tileRange.minY &&
+       this.maxX == tileRange.maxX && this.maxY == tileRange.maxY;
+  }
+
+  /**
+   * @param {module:ol/TileRange} tileRange Tile range.
+   */
+  extend(tileRange) {
+    if (tileRange.minX < this.minX) {
+      this.minX = tileRange.minX;
+    }
+    if (tileRange.maxX > this.maxX) {
+      this.maxX = tileRange.maxX;
+    }
+    if (tileRange.minY < this.minY) {
+      this.minY = tileRange.minY;
+    }
+    if (tileRange.maxY > this.maxY) {
+      this.maxY = tileRange.maxY;
+    }
+  }
+
+  /**
+  * @return {number} Height.
+  */
+  getHeight() {
+    return this.maxY - this.minY + 1;
+  }
+
+  /**
+  * @return {module:ol/size~Size} Size.
+  */
+  getSize() {
+    return [this.getWidth(), this.getHeight()];
+  }
+
+  /**
+  * @return {number} Width.
+  */
+  getWidth() {
+    return this.maxX - this.minX + 1;
+  }
+
+  /**
+  * @param {module:ol/TileRange} tileRange Tile range.
+  * @return {boolean} Intersects.
+  */
+  intersects(tileRange) {
+    return this.minX <= tileRange.maxX &&
+       this.maxX >= tileRange.minX &&
+       this.minY <= tileRange.maxY &&
+       this.maxY >= tileRange.minY;
+  }
+}
 
 
 /**
@@ -58,96 +146,4 @@ export function createOrUpdate(minX, maxX, minY, maxY, tileRange) {
 }
 
 
-/**
- * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.
- * @return {boolean} Contains tile coordinate.
- */
-TileRange.prototype.contains = function(tileCoord) {
-  return this.containsXY(tileCoord[1], tileCoord[2]);
-};
-
-
-/**
- * @param {module:ol/TileRange} tileRange Tile range.
- * @return {boolean} Contains.
- */
-TileRange.prototype.containsTileRange = function(tileRange) {
-  return this.minX <= tileRange.minX && tileRange.maxX <= this.maxX &&
-      this.minY <= tileRange.minY && tileRange.maxY <= this.maxY;
-};
-
-
-/**
- * @param {number} x Tile coordinate x.
- * @param {number} y Tile coordinate y.
- * @return {boolean} Contains coordinate.
- */
-TileRange.prototype.containsXY = function(x, y) {
-  return this.minX <= x && x <= this.maxX && this.minY <= y && y <= this.maxY;
-};
-
-
-/**
- * @param {module:ol/TileRange} tileRange Tile range.
- * @return {boolean} Equals.
- */
-TileRange.prototype.equals = function(tileRange) {
-  return this.minX == tileRange.minX && this.minY == tileRange.minY &&
-      this.maxX == tileRange.maxX && this.maxY == tileRange.maxY;
-};
-
-
-/**
- * @param {module:ol/TileRange} tileRange Tile range.
- */
-TileRange.prototype.extend = function(tileRange) {
-  if (tileRange.minX < this.minX) {
-    this.minX = tileRange.minX;
-  }
-  if (tileRange.maxX > this.maxX) {
-    this.maxX = tileRange.maxX;
-  }
-  if (tileRange.minY < this.minY) {
-    this.minY = tileRange.minY;
-  }
-  if (tileRange.maxY > this.maxY) {
-    this.maxY = tileRange.maxY;
-  }
-};
-
-
-/**
- * @return {number} Height.
- */
-TileRange.prototype.getHeight = function() {
-  return this.maxY - this.minY + 1;
-};
-
-
-/**
- * @return {module:ol/size~Size} Size.
- */
-TileRange.prototype.getSize = function() {
-  return [this.getWidth(), this.getHeight()];
-};
-
-
-/**
- * @return {number} Width.
- */
-TileRange.prototype.getWidth = function() {
-  return this.maxX - this.minX + 1;
-};
-
-
-/**
- * @param {module:ol/TileRange} tileRange Tile range.
- * @return {boolean} Intersects.
- */
-TileRange.prototype.intersects = function(tileRange) {
-  return this.minX <= tileRange.maxX &&
-      this.maxX >= tileRange.minX &&
-      this.minY <= tileRange.maxY &&
-      this.maxY >= tileRange.minY;
-};
 export default TileRange;

src/ol/VectorImageTile.js

@@ -1,7 +1,7 @@
 /**
  * @module ol/VectorImageTile
  */
-import {getUid, inherits} from './util.js';
+import {getUid} from './util.js';
 import Tile from './Tile.js';
 import TileState from './TileState.js';
 import {createCanvasContext2D} from './dom.js';
@@ -21,9 +21,9 @@ import {UNDEFINED} from './functions.js';
  */
 
 
-/**
- * @constructor
- * @extends {module:ol/Tile}
+class VectorImageTile extends Tile {
+
+  /**
    * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.
    * @param {module:ol/TileState} state State.
    * @param {number} sourceRevision Source revision.
@@ -43,11 +43,11 @@ import {UNDEFINED} from './functions.js';
    *     Function to call when a source tile's state changes.
    * @param {number} zoom Integer zoom to render the tile for.
    */
-const VectorImageTile = function(tileCoord, state, sourceRevision, format,
-  tileLoadFunction, urlTileCoord, tileUrlFunction, sourceTileGrid, tileGrid,
-  sourceTiles, pixelRatio, projection, tileClass, handleTileChange, zoom) {
+  constructor(tileCoord, state, sourceRevision, format, tileLoadFunction,
+    urlTileCoord, tileUrlFunction, sourceTileGrid, tileGrid, sourceTiles,
+    pixelRatio, projection, tileClass, handleTileChange, zoom) {
 
-  Tile.call(this, tileCoord, state, {transition: 0});
+    super(tileCoord, state, {transition: 0});
 
     /**
      * @private
@@ -157,15 +157,12 @@ const VectorImageTile = function(tileCoord, state, sourceRevision, format,
       }
     }
 
-};
+  }
 
-inherits(VectorImageTile, Tile);
-
-
-/**
+  /**
    * @inheritDoc
    */
-VectorImageTile.prototype.disposeInternal = function() {
+  disposeInternal() {
     this.state = TileState.ABORT;
     this.changed();
     if (this.interimTile) {
@@ -187,39 +184,36 @@ VectorImageTile.prototype.disposeInternal = function() {
     this.loadListenerKeys_.length = 0;
     this.sourceTileListenerKeys_.forEach(unlistenByKey);
     this.sourceTileListenerKeys_.length = 0;
-  Tile.prototype.disposeInternal.call(this);
-};
+    super.disposeInternal();
+  }
 
-
-/**
+  /**
    * @param {module:ol/layer/Layer} layer Layer.
    * @return {CanvasRenderingContext2D} The rendering context.
    */
-VectorImageTile.prototype.getContext = function(layer) {
+  getContext(layer) {
     const key = getUid(layer).toString();
     if (!(key in this.context_)) {
       this.context_[key] = createCanvasContext2D();
     }
     return this.context_[key];
-};
+  }
 
-
-/**
+  /**
    * Get the Canvas for this tile.
    * @param {module:ol/layer/Layer} layer Layer.
    * @return {HTMLCanvasElement} Canvas.
    */
-VectorImageTile.prototype.getImage = function(layer) {
+  getImage(layer) {
     return this.getReplayState(layer).renderedTileRevision == -1 ?
       null : this.getContext(layer).canvas;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/layer/Layer} layer Layer.
    * @return {module:ol/VectorImageTile~ReplayState} The replay state.
    */
-VectorImageTile.prototype.getReplayState = function(layer) {
+  getReplayState(layer) {
     const key = getUid(layer).toString();
     if (!(key in this.replayState_)) {
       this.replayState_[key] = {
@@ -230,30 +224,27 @@ VectorImageTile.prototype.getReplayState = function(layer) {
       };
     }
     return this.replayState_[key];
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-VectorImageTile.prototype.getKey = function() {
+  getKey() {
     return this.tileKeys.join('/') + '-' + this.sourceRevision_;
-};
+  }
 
-
-/**
+  /**
    * @param {string} tileKey Key (tileCoord) of the source tile.
    * @return {module:ol/VectorTile} Source tile.
    */
-VectorImageTile.prototype.getTile = function(tileKey) {
+  getTile(tileKey) {
     return this.sourceTiles_[tileKey];
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-VectorImageTile.prototype.load = function() {
+  load() {
     // Source tiles with LOADED state - we just count them because once they are
     // loaded, we're no longer listening to state changes.
     let leftToLoad = 0;
@@ -296,13 +287,12 @@ VectorImageTile.prototype.load = function() {
     if (leftToLoad - Object.keys(errorSourceTiles).length == 0) {
       setTimeout(this.finishLoading_.bind(this), 0);
     }
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-VectorImageTile.prototype.finishLoading_ = function() {
+  finishLoading_() {
     let loaded = this.tileKeys.length;
     let empty = 0;
     for (let i = loaded - 1; i >= 0; --i) {
@@ -321,7 +311,9 @@ VectorImageTile.prototype.finishLoading_ = function() {
     } else {
       this.setState(empty == this.tileKeys.length ? TileState.EMPTY : TileState.ERROR);
     }
-};
+  }
+}
+
 
 export default VectorImageTile;
 

src/ol/VectorTile.js

@@ -1,19 +1,26 @@
 /**
  * @module ol/VectorTile
  */
-import {getUid, inherits} from './util.js';
+import {getUid} from './util.js';
 import Tile from './Tile.js';
 import TileState from './TileState.js';
 
+/**
+ * @const
+ * @type {module:ol/extent~Extent}
+ */
+const DEFAULT_EXTENT = [0, 0, 4096, 4096];
+
+
 /**
  * @typedef {function(new: module:ol/VectorTile, module:ol/tilecoord~TileCoord,
  * module:ol/TileState, string, ?string, module:ol/Tile~LoadFunction)} TileClass
  * @api
  */
 
-/**
- * @constructor
- * @extends {module:ol/Tile}
+class VectorTile extends Tile {
+
+  /**
    * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.
    * @param {module:ol/TileState} state State.
    * @param {string} src Data source url.
@@ -21,9 +28,9 @@ import TileState from './TileState.js';
    * @param {module:ol/Tile~LoadFunction} tileLoadFunction Tile load function.
    * @param {module:ol/Tile~Options=} opt_options Tile options.
    */
-const VectorTile = function(tileCoord, state, src, format, tileLoadFunction, opt_options) {
+  constructor(tileCoord, state, src, format, tileLoadFunction, opt_options) {
 
-  Tile.call(this, tileCoord, state, opt_options);
+    super(tileCoord, state, opt_options);
 
     /**
      * @type {number}
@@ -79,123 +86,104 @@ const VectorTile = function(tileCoord, state, src, format, tileLoadFunction, opt
      */
     this.url_ = src;
 
-};
+  }
 
-inherits(VectorTile, Tile);
-
-/**
- * @const
- * @type {module:ol/extent~Extent}
- */
-const DEFAULT_EXTENT = [0, 0, 4096, 4096];
-
-
-/**
+  /**
    * @inheritDoc
    */
-VectorTile.prototype.disposeInternal = function() {
+  disposeInternal() {
     this.features_ = null;
     this.replayGroups_ = {};
     this.state = TileState.ABORT;
     this.changed();
-  Tile.prototype.disposeInternal.call(this);
-};
+    super.disposeInternal();
+  }
 
-
-/**
+  /**
    * Gets the extent of the vector tile.
    * @return {module:ol/extent~Extent} The extent.
    * @api
    */
-VectorTile.prototype.getExtent = function() {
+  getExtent() {
     return this.extent_ || DEFAULT_EXTENT;
-};
+  }
 
-
-/**
+  /**
    * Get the feature format assigned for reading this tile's features.
    * @return {module:ol/format/Feature} Feature format.
    * @api
    */
-VectorTile.prototype.getFormat = function() {
+  getFormat() {
     return this.format_;
-};
+  }
 
-
-/**
+  /**
    * Get the features for this tile. Geometries will be in the projection returned
    * by {@link module:ol/VectorTile~VectorTile#getProjection}.
    * @return {Array.<module:ol/Feature|module:ol/render/Feature>} Features.
    * @api
    */
-VectorTile.prototype.getFeatures = function() {
+  getFeatures() {
     return this.features_;
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-VectorTile.prototype.getKey = function() {
+  getKey() {
     return this.url_;
-};
+  }
 
-
-/**
+  /**
    * Get the feature projection of features returned by
    * {@link module:ol/VectorTile~VectorTile#getFeatures}.
    * @return {module:ol/proj/Projection} Feature projection.
    * @api
    */
-VectorTile.prototype.getProjection = function() {
+  getProjection() {
     return this.projection_;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/layer/Layer} layer Layer.
    * @param {string} key Key.
    * @return {module:ol/render/ReplayGroup} Replay group.
    */
-VectorTile.prototype.getReplayGroup = function(layer, key) {
+  getReplayGroup(layer, key) {
     return this.replayGroups_[getUid(layer) + ',' + key];
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-VectorTile.prototype.load = function() {
+  load() {
     if (this.state == TileState.IDLE) {
       this.setState(TileState.LOADING);
       this.tileLoadFunction_(this, this.url_);
       this.loader_(null, NaN, null);
     }
-};
+  }
 
-
-/**
+  /**
    * Handler for successful tile load.
    * @param {Array.<module:ol/Feature>} features The loaded features.
    * @param {module:ol/proj/Projection} dataProjection Data projection.
    * @param {module:ol/extent~Extent} extent Extent.
    */
-VectorTile.prototype.onLoad = function(features, dataProjection, extent) {
+  onLoad(features, dataProjection, extent) {
     this.setProjection(dataProjection);
     this.setFeatures(features);
     this.setExtent(extent);
-};
+  }
 
-
-/**
+  /**
    * Handler for tile load errors.
    */
-VectorTile.prototype.onError = function() {
+  onError() {
     this.setState(TileState.ERROR);
-};
+  }
 
-
-/**
+  /**
    * Function for use in an {@link module:ol/source/VectorTile~VectorTile}'s
    * `tileLoadFunction`. Sets the extent of the vector tile. This is only required
    * for tiles in projections with `tile-pixels` as units. The extent should be
@@ -207,52 +195,49 @@ VectorTile.prototype.onError = function() {
    * @param {module:ol/extent~Extent} extent The extent.
    * @api
    */
-VectorTile.prototype.setExtent = function(extent) {
+  setExtent(extent) {
     this.extent_ = extent;
-};
+  }
 
-
-/**
+  /**
    * Function for use in an {@link module:ol/source/VectorTile~VectorTile}'s `tileLoadFunction`.
    * Sets the features for the tile.
    * @param {Array.<module:ol/Feature>} features Features.
    * @api
    */
-VectorTile.prototype.setFeatures = function(features) {
+  setFeatures(features) {
     this.features_ = features;
     this.setState(TileState.LOADED);
-};
+  }
 
-
-/**
+  /**
    * Function for use in an {@link module:ol/source/VectorTile~VectorTile}'s `tileLoadFunction`.
    * Sets the projection of the features that were added with
    * {@link module:ol/VectorTile~VectorTile#setFeatures}.
    * @param {module:ol/proj/Projection} projection Feature projection.
    * @api
    */
-VectorTile.prototype.setProjection = function(projection) {
+  setProjection(projection) {
     this.projection_ = projection;
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/layer/Layer} layer Layer.
    * @param {string} key Key.
    * @param {module:ol/render/ReplayGroup} replayGroup Replay group.
    */
-VectorTile.prototype.setReplayGroup = function(layer, key, replayGroup) {
+  setReplayGroup(layer, key, replayGroup) {
     this.replayGroups_[getUid(layer) + ',' + key] = replayGroup;
-};
+  }
 
-
-/**
+  /**
    * Set the feature loader for reading this tile's features.
    * @param {module:ol/featureloader~FeatureLoader} loader Feature loader.
    * @api
    */
-VectorTile.prototype.setLoader = function(loader) {
+  setLoader(loader) {
     this.loader_ = loader;
-};
+  }
+}
 
 export default VectorTile;

src/ol/View.js

@@ -2,7 +2,7 @@
  * @module ol/View
  */
 import {DEFAULT_TILE_SIZE} from './tilegrid/common.js';
-import {getUid, inherits} from './util.js';
+import {getUid} from './util.js';
 import {UNDEFINED} from './functions.js';
 import {createExtent, none as centerNone} from './centerconstraint.js';
 import BaseObject from './Object.js';
@@ -33,7 +33,7 @@ import Units from './proj/Units.js';
  * @property {number} [sourceResolution]
  * @property {number} [targetResolution]
  * @property {number} [sourceRotation]
- * @property {number} [sourceRotation]
+ * @property {number} [targetRotation]
  * @property {module:ol/coordinate~Coordinate} [anchor]
  * @property {number} start
  * @property {number} duration
@@ -224,13 +224,15 @@ const DEFAULT_MIN_ZOOM = 0;
  * The *center constraint* is determined by the `extent` option. By
  * default the center is not constrained at all.
  *
- * @constructor
- * @extends {module:ol/Object}
- * @param {module:ol/View~ViewOptions=} opt_options View options.
   * @api
  */
-const View = function(opt_options) {
-  BaseObject.call(this);
+class View extends BaseObject {
+
+  /**
+   * @param {module:ol/View~ViewOptions=} opt_options View options.
+   */
+  constructor(opt_options) {
+    super();
 
     const options = assign({}, opt_options);
 
@@ -262,16 +264,13 @@ const View = function(opt_options) {
     this.projection_ = createProjection(options.projection, 'EPSG:3857');
 
     this.applyOptions_(options);
-};
+  }
 
-inherits(View, BaseObject);
-
-
-/**
+  /**
    * Set up the view with the given options.
    * @param {module:ol/View~ViewOptions} options View options.
    */
-View.prototype.applyOptions_ = function(options) {
+  applyOptions_(options) {
 
     /**
      * @type {Object.<string, *>}
@@ -347,9 +346,9 @@ View.prototype.applyOptions_ = function(options) {
      */
     this.options_ = options;
 
-};
+  }
 
-/**
+  /**
    * Get an updated version of the view options used to construct the view.  The
    * current resolution (or zoom), center, and rotation are applied to any stored
    * options.  The provided options can be used to apply new min/max zoom or
@@ -357,7 +356,7 @@ View.prototype.applyOptions_ = function(options) {
    * @param {module:ol/View~ViewOptions} newOptions New options to be applied.
    * @return {module:ol/View~ViewOptions} New options updated with the current view state.
    */
-View.prototype.getUpdatedOptions_ = function(newOptions) {
+  getUpdatedOptions_(newOptions) {
     const options = assign({}, this.options_);
 
     // preserve resolution (or zoom)
@@ -374,10 +373,9 @@ View.prototype.getUpdatedOptions_ = function(newOptions) {
     options.rotation = this.getRotation();
 
     return assign({}, options, newOptions);
-};
+  }
 
-
-/**
+  /**
    * Animate the view.  The view's center, zoom (or resolution), and rotation
    * can be animated for smooth transitions between view states.  For example,
    * to animate the view to a new zoom level:
@@ -410,7 +408,7 @@ View.prototype.getUpdatedOptions_ = function(newOptions) {
    *     the animation completed without being cancelled.
    * @api
    */
-View.prototype.animate = function(var_args) {
+  animate(var_args) {
     let animationCount = arguments.length;
     let callback;
     if (animationCount > 1 && typeof arguments[animationCount - 1] === 'function') {
@@ -490,34 +488,31 @@ View.prototype.animate = function(var_args) {
     this.animations_.push(series);
     this.setHint(ViewHint.ANIMATING, 1);
     this.updateAnimations_();
-};
+  }
 
-
-/**
+  /**
    * Determine if the view is being animated.
    * @return {boolean} The view is being animated.
    * @api
    */
-View.prototype.getAnimating = function() {
+  getAnimating() {
     return this.hints_[ViewHint.ANIMATING] > 0;
-};
+  }
 
-
-/**
+  /**
    * Determine if the user is interacting with the view, such as panning or zooming.
    * @return {boolean} The view is being interacted with.
    * @api
    */
-View.prototype.getInteracting = function() {
+  getInteracting() {
     return this.hints_[ViewHint.INTERACTING] > 0;
-};
+  }
 
-
-/**
+  /**
    * Cancel any ongoing animations.
    * @api
    */
-View.prototype.cancelAnimations = function() {
+  cancelAnimations() {
     this.setHint(ViewHint.ANIMATING, -this.hints_[ViewHint.ANIMATING]);
     for (let i = 0, ii = this.animations_.length; i < ii; ++i) {
       const series = this.animations_[i];
@@ -526,12 +521,12 @@ View.prototype.cancelAnimations = function() {
       }
     }
     this.animations_.length = 0;
-};
+  }
 
-/**
+  /**
    * Update all animations.
    */
-View.prototype.updateAnimations_ = function() {
+  updateAnimations_() {
     if (this.updateAnimationKey_ !== undefined) {
       cancelAnimationFrame(this.updateAnimationKey_);
       this.updateAnimationKey_ = undefined;
@@ -608,14 +603,14 @@ View.prototype.updateAnimations_ = function() {
     if (more && this.updateAnimationKey_ === undefined) {
       this.updateAnimationKey_ = requestAnimationFrame(this.updateAnimations_);
     }
-};
+  }
 
-/**
+  /**
    * @param {number} rotation Target rotation.
    * @param {module:ol/coordinate~Coordinate} anchor Rotation anchor.
    * @return {module:ol/coordinate~Coordinate|undefined} Center for rotation and anchor.
    */
-View.prototype.calculateCenterRotate = function(rotation, anchor) {
+  calculateCenterRotate(rotation, anchor) {
     let center;
     const currentCenter = this.getCenter();
     if (currentCenter !== undefined) {
@@ -624,15 +619,14 @@ View.prototype.calculateCenterRotate = function(rotation, anchor) {
       addCoordinate(center, anchor);
     }
     return center;
-};
+  }
 
-
-/**
+  /**
    * @param {number} resolution Target resolution.
    * @param {module:ol/coordinate~Coordinate} anchor Zoom anchor.
    * @return {module:ol/coordinate~Coordinate|undefined} Center for resolution and anchor.
    */
-View.prototype.calculateCenterZoom = function(resolution, anchor) {
+  calculateCenterZoom(resolution, anchor) {
     let center;
     const currentCenter = this.getCenter();
     const currentResolution = this.getResolution();
@@ -642,14 +636,13 @@ View.prototype.calculateCenterZoom = function(resolution, anchor) {
       center = [x, y];
     }
     return center;
-};
+  }
 
-
-/**
+  /**
    * @private
    * @return {module:ol/size~Size} Viewport size or `[100, 100]` when no viewport is found.
    */
-View.prototype.getSizeFromViewport_ = function() {
+  getSizeFromViewport_() {
     const size = [100, 100];
     const selector = '.ol-viewport[data-view="' + getUid(this) + '"]';
     const element = document.querySelector(selector);
@@ -659,21 +652,19 @@ View.prototype.getSizeFromViewport_ = function() {
       size[1] = parseInt(metrics.height, 10);
     }
     return size;
-};
+  }
 
-
-/**
+  /**
    * Get the constrained center of this view.
    * @param {module:ol/coordinate~Coordinate|undefined} center Center.
    * @return {module:ol/coordinate~Coordinate|undefined} Constrained center.
    * @api
    */
-View.prototype.constrainCenter = function(center) {
+  constrainCenter(center) {
     return this.constraints_.center(center);
-};
+  }
 
-
-/**
+  /**
    * Get the constrained resolution of this view.
    * @param {number|undefined} resolution Resolution.
    * @param {number=} opt_delta Delta. Default is `0`.
@@ -681,52 +672,48 @@ View.prototype.constrainCenter = function(center) {
    * @return {number|undefined} Constrained resolution.
    * @api
    */
-View.prototype.constrainResolution = function(resolution, opt_delta, opt_direction) {
+  constrainResolution(resolution, opt_delta, opt_direction) {
     const delta = opt_delta || 0;
     const direction = opt_direction || 0;
     return this.constraints_.resolution(resolution, delta, direction);
-};
+  }
 
-
-/**
+  /**
    * Get the constrained rotation of this view.
    * @param {number|undefined} rotation Rotation.
    * @param {number=} opt_delta Delta. Default is `0`.
    * @return {number|undefined} Constrained rotation.
    * @api
    */
-View.prototype.constrainRotation = function(rotation, opt_delta) {
+  constrainRotation(rotation, opt_delta) {
     const delta = opt_delta || 0;
     return this.constraints_.rotation(rotation, delta);
-};
+  }
 
-
-/**
+  /**
    * Get the view center.
    * @return {module:ol/coordinate~Coordinate|undefined} The center of the view.
    * @observable
    * @api
    */
-View.prototype.getCenter = function() {
+  getCenter() {
     return (
       /** @type {module:ol/coordinate~Coordinate|undefined} */ (this.get(ViewProperty.CENTER))
     );
-};
+  }
 
-
-/**
+  /**
    * @return {module:ol/View~Constraints} Constraints.
    */
-View.prototype.getConstraints = function() {
+  getConstraints() {
     return this.constraints_;
-};
+  }
 
-
-/**
+  /**
    * @param {Array.<number>=} opt_hints Destination array.
    * @return {Array.<number>} Hint.
    */
-View.prototype.getHints = function(opt_hints) {
+  getHints(opt_hints) {
     if (opt_hints !== undefined) {
       opt_hints[0] = this.hints_[0];
       opt_hints[1] = this.hints_[1];
@@ -734,10 +721,9 @@ View.prototype.getHints = function(opt_hints) {
     } else {
       return this.hints_.slice();
     }
-};
+  }
 
-
-/**
+  /**
    * Calculate the extent for the current view state and the passed size.
    * The size is the pixel dimensions of the box into which the calculated extent
    * should fit. In most cases you want to get the extent of the entire map,
@@ -747,7 +733,7 @@ View.prototype.getHints = function(opt_hints) {
    * @return {module:ol/extent~Extent} Extent.
    * @api
    */
-View.prototype.calculateExtent = function(opt_size) {
+  calculateExtent(opt_size) {
     const size = opt_size || this.getSizeFromViewport_();
     const center = /** @type {!module:ol/coordinate~Coordinate} */ (this.getCenter());
     assert(center, 1); // The view center is not defined
@@ -757,102 +743,92 @@ View.prototype.calculateExtent = function(opt_size) {
     assert(rotation !== undefined, 3); // The view rotation is not defined
 
     return getForViewAndSize(center, resolution, rotation, size);
-};
+  }
 
-
-/**
+  /**
    * Get the maximum resolution of the view.
    * @return {number} The maximum resolution of the view.
    * @api
    */
-View.prototype.getMaxResolution = function() {
+  getMaxResolution() {
     return this.maxResolution_;
-};
+  }
 
-
-/**
+  /**
    * Get the minimum resolution of the view.
    * @return {number} The minimum resolution of the view.
    * @api
    */
-View.prototype.getMinResolution = function() {
+  getMinResolution() {
     return this.minResolution_;
-};
+  }
 
-
-/**
+  /**
    * Get the maximum zoom level for the view.
    * @return {number} The maximum zoom level.
    * @api
    */
-View.prototype.getMaxZoom = function() {
+  getMaxZoom() {
     return /** @type {number} */ (this.getZoomForResolution(this.minResolution_));
-};
+  }
 
-
-/**
+  /**
    * Set a new maximum zoom level for the view.
    * @param {number} zoom The maximum zoom level.
    * @api
    */
-View.prototype.setMaxZoom = function(zoom) {
+  setMaxZoom(zoom) {
     this.applyOptions_(this.getUpdatedOptions_({maxZoom: zoom}));
-};
+  }
 
-
-/**
+  /**
    * Get the minimum zoom level for the view.
    * @return {number} The minimum zoom level.
    * @api
    */
-View.prototype.getMinZoom = function() {
+  getMinZoom() {
     return /** @type {number} */ (this.getZoomForResolution(this.maxResolution_));
-};
+  }
 
-
-/**
+  /**
    * Set a new minimum zoom level for the view.
    * @param {number} zoom The minimum zoom level.
    * @api
    */
-View.prototype.setMinZoom = function(zoom) {
+  setMinZoom(zoom) {
     this.applyOptions_(this.getUpdatedOptions_({minZoom: zoom}));
-};
+  }
 
-
-/**
+  /**
    * Get the view projection.
    * @return {module:ol/proj/Projection} The projection of the view.
    * @api
    */
-View.prototype.getProjection = function() {
+  getProjection() {
     return this.projection_;
-};
+  }
 
-
-/**
+  /**
    * Get the view resolution.
    * @return {number|undefined} The resolution of the view.
    * @observable
    * @api
    */
-View.prototype.getResolution = function() {
+  getResolution() {
     return /** @type {number|undefined} */ (this.get(ViewProperty.RESOLUTION));
-};
+  }
 
-
-/**
+  /**
    * Get the resolutions for the view. This returns the array of resolutions
    * passed to the constructor of the View, or undefined if none were given.
    * @return {Array.<number>|undefined} The resolutions of the view.
    * @api
    */
-View.prototype.getResolutions = function() {
+  getResolutions() {
     return this.resolutions_;
-};
+  }
 
-
-/**
+  /**
    * Get the resolution for a provided extent (in map units) and size (in pixels).
    * @param {module:ol/extent~Extent} extent Extent.
    * @param {module:ol/size~Size=} opt_size Box pixel size.
@@ -860,21 +836,20 @@ View.prototype.getResolutions = function() {
    *     the given size.
    * @api
    */
-View.prototype.getResolutionForExtent = function(extent, opt_size) {
+  getResolutionForExtent(extent, opt_size) {
     const size = opt_size || this.getSizeFromViewport_();
     const xResolution = getWidth(extent) / size[0];
     const yResolution = getHeight(extent) / size[1];
     return Math.max(xResolution, yResolution);
-};
+  }
 
-
-/**
+  /**
    * Return a function that returns a value between 0 and 1 for a
    * resolution. Exponential scaling is assumed.
    * @param {number=} opt_power Power.
    * @return {function(number): number} Resolution for value function.
    */
-View.prototype.getResolutionForValueFunction = function(opt_power) {
+  getResolutionForValueFunction(opt_power) {
     const power = opt_power || 2;
     const maxResolution = this.maxResolution_;
     const minResolution = this.minResolution_;
@@ -888,27 +863,25 @@ View.prototype.getResolutionForValueFunction = function(opt_power) {
         const resolution = maxResolution / Math.pow(power, value * max);
         return resolution;
       });
-};
+  }
 
-
-/**
+  /**
    * Get the view rotation.
    * @return {number} The rotation of the view in radians.
    * @observable
    * @api
    */
-View.prototype.getRotation = function() {
+  getRotation() {
     return /** @type {number} */ (this.get(ViewProperty.ROTATION));
-};
+  }
 
-
-/**
+  /**
    * Return a function that returns a resolution for a value between
    * 0 and 1. Exponential scaling is assumed.
    * @param {number=} opt_power Power.
    * @return {function(number): number} Value for resolution function.
    */
-View.prototype.getValueForResolutionFunction = function(opt_power) {
+  getValueForResolutionFunction(opt_power) {
     const power = opt_power || 2;
     const maxResolution = this.maxResolution_;
     const minResolution = this.minResolution_;
@@ -922,13 +895,12 @@ View.prototype.getValueForResolutionFunction = function(opt_power) {
         const value = (Math.log(maxResolution / resolution) / Math.log(power)) / max;
         return value;
       });
-};
+  }
 
-
-/**
+  /**
    * @return {module:ol/View~State} View state.
    */
-View.prototype.getState = function() {
+  getState() {
     const center = /** @type {module:ol/coordinate~Coordinate} */ (this.getCenter());
     const projection = this.getProjection();
     const resolution = /** @type {number} */ (this.getResolution());
@@ -942,33 +914,31 @@ View.prototype.getState = function() {
         zoom: this.getZoom()
       })
     );
-};
+  }
 
-
-/**
+  /**
    * Get the current zoom level.  If you configured your view with a resolutions
    * array (this is rare), this method may return non-integer zoom levels (so
    * the zoom level is not safe to use as an index into a resolutions array).
    * @return {number|undefined} Zoom.
    * @api
    */
-View.prototype.getZoom = function() {
+  getZoom() {
     let zoom;
     const resolution = this.getResolution();
     if (resolution !== undefined) {
       zoom = this.getZoomForResolution(resolution);
     }
     return zoom;
-};
+  }
 
-
-/**
+  /**
    * Get the zoom level for a resolution.
    * @param {number} resolution The resolution.
    * @return {number|undefined} The zoom level for the provided resolution.
    * @api
    */
-View.prototype.getZoomForResolution = function(resolution) {
+  getZoomForResolution(resolution) {
     let offset = this.minZoom_ || 0;
     let max, zoomFactor;
     if (this.resolutions_) {
@@ -985,22 +955,20 @@ View.prototype.getZoomForResolution = function(resolution) {
       zoomFactor = this.zoomFactor_;
     }
     return offset + Math.log(max / resolution) / Math.log(zoomFactor);
-};
+  }
 
-
-/**
+  /**
    * Get the resolution for a zoom level.
    * @param {number} zoom Zoom level.
    * @return {number} The view resolution for the provided zoom level.
    * @api
    */
-View.prototype.getResolutionForZoom = function(zoom) {
+  getResolutionForZoom(zoom) {
     return /** @type {number} */ (this.constrainResolution(
       this.maxResolution_, zoom - this.minZoom_, 0));
-};
+  }
 
-
-/**
+  /**
    * Fit the given geometry or extent based on the given map size and border.
    * The size is pixel dimensions of the box to fit the extent into.
    * In most cases you will want to use the map size, that is `map.getSize()`.
@@ -1010,7 +978,7 @@ View.prototype.getResolutionForZoom = function(zoom) {
    * @param {module:ol/View~FitOptions=} opt_options Options.
    * @api
    */
-View.prototype.fit = function(geometryOrExtent, opt_options) {
+  fit(geometryOrExtent, opt_options) {
     const options = opt_options || {};
     let size = options.size;
     if (!size) {
@@ -1103,17 +1071,16 @@ View.prototype.fit = function(geometryOrExtent, opt_options) {
       this.setCenter(center);
       setTimeout(callback.bind(undefined, true), 0);
     }
-};
+  }
 
-
-/**
+  /**
    * Center on coordinate and view position.
    * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.
    * @param {module:ol/size~Size} size Box pixel size.
- * @param {module:ol~Pixel} position Position on the view to center on.
+   * @param {module:ol/pixel~Pixel} position Position on the view to center on.
    * @api
    */
-View.prototype.centerOn = function(coordinate, size, position) {
+  centerOn(coordinate, size, position) {
     // calculate rotated position
     const rotation = this.getRotation();
     const cosAngle = Math.cos(-rotation);
@@ -1130,94 +1097,88 @@ View.prototype.centerOn = function(coordinate, size, position) {
     const centerY = rotY * cosAngle + rotX * sinAngle;
 
     this.setCenter([centerX, centerY]);
-};
+  }
 
-
-/**
+  /**
    * @return {boolean} Is defined.
    */
-View.prototype.isDef = function() {
+  isDef() {
     return !!this.getCenter() && this.getResolution() !== undefined;
-};
+  }
 
-
-/**
+  /**
    * Rotate the view around a given coordinate.
    * @param {number} rotation New rotation value for the view.
    * @param {module:ol/coordinate~Coordinate=} opt_anchor The rotation center.
    * @api
    */
-View.prototype.rotate = function(rotation, opt_anchor) {
+  rotate(rotation, opt_anchor) {
     if (opt_anchor !== undefined) {
       const center = this.calculateCenterRotate(rotation, opt_anchor);
       this.setCenter(center);
     }
     this.setRotation(rotation);
-};
+  }
 
-
-/**
+  /**
    * Set the center of the current view.
    * @param {module:ol/coordinate~Coordinate|undefined} center The center of the view.
    * @observable
    * @api
    */
-View.prototype.setCenter = function(center) {
+  setCenter(center) {
     this.set(ViewProperty.CENTER, center);
     if (this.getAnimating()) {
       this.cancelAnimations();
     }
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/ViewHint} hint Hint.
    * @param {number} delta Delta.
    * @return {number} New value.
    */
-View.prototype.setHint = function(hint, delta) {
+  setHint(hint, delta) {
     this.hints_[hint] += delta;
     this.changed();
     return this.hints_[hint];
-};
+  }
 
-
-/**
+  /**
    * Set the resolution for this view.
    * @param {number|undefined} resolution The resolution of the view.
    * @observable
    * @api
    */
-View.prototype.setResolution = function(resolution) {
+  setResolution(resolution) {
     this.set(ViewProperty.RESOLUTION, resolution);
     if (this.getAnimating()) {
       this.cancelAnimations();
     }
-};
+  }
 
-
-/**
+  /**
    * Set the rotation for this view.
    * @param {number} rotation The rotation of the view in radians.
    * @observable
    * @api
    */
-View.prototype.setRotation = function(rotation) {
+  setRotation(rotation) {
     this.set(ViewProperty.ROTATION, rotation);
     if (this.getAnimating()) {
       this.cancelAnimations();
     }
-};
+  }
 
-
-/**
+  /**
    * Zoom to a specific zoom level.
    * @param {number} zoom Zoom level.
    * @api
    */
-View.prototype.setZoom = function(zoom) {
+  setZoom(zoom) {
     this.setResolution(this.getResolutionForZoom(zoom));
-};
+  }
+}
 
 
 /**

src/ol/WebGLMap.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/WebGLMap
  */
-import {inherits} from './util.js';
 import PluggableMap from './PluggableMap.js';
 import {defaults as defaultControls} from './control.js';
 import {defaults as defaultInteractions} from './interaction.js';
@@ -57,16 +56,18 @@ import WebGLVectorLayerRenderer from './renderer/webgl/VectorLayer.js';
  * {@link module:ol/layer/Base}, so layers entered in the options or added
  * with `addLayer` can be groups, which can contain further groups, and so on.
  *
- * @constructor
- * @extends {module:ol/PluggableMap}
- * @param {module:ol/PluggableMap~MapOptions} options Map options.
  * @fires module:ol/MapBrowserEvent~MapBrowserEvent
  * @fires module:ol/MapEvent~MapEvent
  * @fires module:ol/render/Event~RenderEvent#postcompose
  * @fires module:ol/render/Event~RenderEvent#precompose
  * @api
  */
-const WebGLMap = function(options) {
+class WebGLMap extends PluggableMap {
+
+  /**
+   * @param {module:ol/PluggableMap~MapOptions} options Map options.
+   */
+  constructor(options) {
     options = assign({}, options);
     if (!options.controls) {
       options.controls = defaultControls();
@@ -75,13 +76,10 @@ const WebGLMap = function(options) {
       options.interactions = defaultInteractions();
     }
 
-  PluggableMap.call(this, options);
-};
+    super(options);
+  }
 
-inherits(WebGLMap, PluggableMap);
-
-
-WebGLMap.prototype.createRenderer = function() {
+  createRenderer() {
     const renderer = new WebGLMapRenderer(this);
     renderer.registerLayerRenderers([
       WebGLImageLayerRenderer,
@@ -89,6 +87,8 @@ WebGLMap.prototype.createRenderer = function() {
       WebGLVectorLayerRenderer
     ]);
     return renderer;
-};
+  }
+}
+
 
 export default WebGLMap;

src/ol/control/Attribution.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/control/Attribution
  */
-import {inherits} from '../util.js';
 import {equals} from '../array.js';
 import Control from '../control/Control.js';
 import {CLASS_CONTROL, CLASS_UNSELECTABLE, CLASS_COLLAPSED} from '../css.js';
@@ -14,7 +13,7 @@ import {visibleAtResolution} from '../layer/Layer.js';
 /**
  * @typedef {Object} Options
  * @property {string} [className='ol-attribution'] CSS class name.
- * @property {Element|string} [target] Specify a target if you
+ * @property {HTMLElement|string} [target] Specify a target if you
  * want the control to be rendered outside of the map's
  * viewport.
  * @property {boolean} [collapsible=true] Specify if attributions can
@@ -26,7 +25,7 @@ import {visibleAtResolution} from '../layer/Layer.js';
  * @property {string} [label='i'] Text label to use for the
  * collapsed attributions button.
  * Instead of text, also an element (e.g. a `span` element) can be used.
- * @property {string|Element} [collapseLabel='»'] Text label to use
+ * @property {string|HTMLElement} [collapseLabel='»'] Text label to use
  * for the expanded attributions button.
  * Instead of text, also an element (e.g. a `span` element) can be used.
  * @property {function(module:ol/MapEvent)} [render] Function called when
@@ -42,18 +41,26 @@ import {visibleAtResolution} from '../layer/Layer.js';
  * By default it will show in the bottom right portion of the map, but this can
  * be changed by using a css selector for `.ol-attribution`.
  *
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/Attribution~Options=} opt_options Attribution options.
  * @api
  */
-const Attribution = function(opt_options) {
+class Attribution extends Control {
+
+  /**
+   * @param {module:ol/control/Attribution~Options=} opt_options Attribution options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
+    super({
+      element: document.createElement('div'),
+      render: options.render || render,
+      target: options.target
+    });
+
     /**
      * @private
-   * @type {Element}
+     * @type {HTMLElement}
      */
     this.ulElement_ = document.createElement('UL');
 
@@ -83,7 +90,7 @@ const Attribution = function(opt_options) {
     if (typeof collapseLabel === 'string') {
       /**
        * @private
-     * @type {Element}
+       * @type {HTMLElement}
        */
       this.collapseLabel_ = document.createElement('span');
       this.collapseLabel_.textContent = collapseLabel;
@@ -96,7 +103,7 @@ const Attribution = function(opt_options) {
     if (typeof label === 'string') {
       /**
        * @private
-     * @type {Element}
+       * @type {HTMLElement}
        */
       this.label_ = document.createElement('span');
       this.label_.textContent = label;
@@ -117,17 +124,11 @@ const Attribution = function(opt_options) {
     const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL +
         (this.collapsed_ && this.collapsible_ ? ' ' + CLASS_COLLAPSED : '') +
         (this.collapsible_ ? '' : ' ol-uncollapsible');
-  const element = document.createElement('div');
+    const element = this.element;
     element.className = cssClasses;
     element.appendChild(this.ulElement_);
     element.appendChild(button);
 
-  Control.call(this, {
-    element: element,
-    render: options.render || render,
-    target: options.target
-  });
-
     /**
      * A list of currently rendered resolutions.
      * @type {Array.<string>}
@@ -141,18 +142,15 @@ const Attribution = function(opt_options) {
      */
     this.renderedVisible_ = true;
 
-};
+  }
 
-inherits(Attribution, Control);
-
-
-/**
+  /**
    * Get a list of visible attributions.
    * @param {module:ol/PluggableMap~FrameState} frameState Frame state.
    * @return {Array.<string>} Attributions.
    * @private
    */
-Attribution.prototype.getSourceAttributions_ = function(frameState) {
+  getSourceAttributions_(frameState) {
     /**
      * Used to determine if an attribution already exists.
      * @type {!Object.<string, boolean>}
@@ -203,25 +201,13 @@ Attribution.prototype.getSourceAttributions_ = function(frameState) {
       }
     }
     return visibleAttributions;
-};
+  }
 
-
-/**
- * Update the attribution element.
- * @param {module:ol/MapEvent} mapEvent Map event.
- * @this {module:ol/control/Attribution}
- * @api
- */
-export function render(mapEvent) {
-  this.updateElement_(mapEvent.frameState);
-}
-
-
-/**
+  /**
    * @private
    * @param {?module:ol/PluggableMap~FrameState} frameState Frame state.
    */
-Attribution.prototype.updateElement_ = function(frameState) {
+  updateElement_(frameState) {
     if (!frameState) {
       if (this.renderedVisible_) {
         this.element.style.display = 'none';
@@ -252,23 +238,21 @@ Attribution.prototype.updateElement_ = function(frameState) {
     }
 
     this.renderedAttributions_ = attributions;
-};
+  }
 
-
-/**
- * @param {Event} event The event to handle
+  /**
+   * @param {MouseEvent} event The event to handle
    * @private
    */
-Attribution.prototype.handleClick_ = function(event) {
+  handleClick_(event) {
     event.preventDefault();
     this.handleToggle_();
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-Attribution.prototype.handleToggle_ = function() {
+  handleToggle_() {
     this.element.classList.toggle(CLASS_COLLAPSED);
     if (this.collapsed_) {
       replaceNode(this.collapseLabel_, this.label_);
@@ -276,25 +260,23 @@ Attribution.prototype.handleToggle_ = function() {
       replaceNode(this.label_, this.collapseLabel_);
     }
     this.collapsed_ = !this.collapsed_;
-};
+  }
 
-
-/**
+  /**
    * Return `true` if the attribution is collapsible, `false` otherwise.
    * @return {boolean} True if the widget is collapsible.
    * @api
    */
-Attribution.prototype.getCollapsible = function() {
+  getCollapsible() {
     return this.collapsible_;
-};
+  }
 
-
-/**
+  /**
    * Set whether the attribution should be collapsible.
    * @param {boolean} collapsible True if the widget is collapsible.
    * @api
    */
-Attribution.prototype.setCollapsible = function(collapsible) {
+  setCollapsible(collapsible) {
     if (this.collapsible_ === collapsible) {
       return;
     }
@@ -303,31 +285,43 @@ Attribution.prototype.setCollapsible = function(collapsible) {
     if (!collapsible && this.collapsed_) {
       this.handleToggle_();
     }
-};
+  }
 
-
-/**
+  /**
    * Collapse or expand the attribution according to the passed parameter. Will
    * not do anything if the attribution isn't collapsible or if the current
    * collapsed state is already the one requested.
    * @param {boolean} collapsed True if the widget is collapsed.
    * @api
    */
-Attribution.prototype.setCollapsed = function(collapsed) {
+  setCollapsed(collapsed) {
     if (!this.collapsible_ || this.collapsed_ === collapsed) {
       return;
     }
     this.handleToggle_();
-};
+  }
 
-
-/**
+  /**
    * Return `true` when the attribution is currently collapsed or `false`
    * otherwise.
    * @return {boolean} True if the widget is collapsed.
    * @api
    */
-Attribution.prototype.getCollapsed = function() {
+  getCollapsed() {
     return this.collapsed_;
-};
+  }
+}
+
+
+/**
+ * Update the attribution element.
+ * @param {module:ol/MapEvent} mapEvent Map event.
+ * @this {module:ol/control/Attribution}
+ * @api
+ */
+export function render(mapEvent) {
+  this.updateElement_(mapEvent.frameState);
+}
+
+
 export default Attribution;

src/ol/control/Control.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/control/Control
  */
-import {inherits} from '../util.js';
 import {UNDEFINED} from '../functions.js';
 import MapEventType from '../MapEventType.js';
 import BaseObject from '../Object.js';
@@ -11,13 +10,13 @@ import {listen, unlistenByKey} from '../events.js';
 
 /**
  * @typedef {Object} Options
- * @property {Element} [element] The element is the control's
+ * @property {HTMLElement} [element] The element is the control's
  * container element. This only needs to be specified if you're developing
  * a custom control.
  * @property {function(module:ol/MapEvent)} [render] Function called when
  * the control should be re-rendered. This is called in a `requestAnimationFrame`
  * callback.
- * @property {Element|string} [target] Specify a target if you want
+ * @property {HTMLElement|string} [target] Specify a target if you want
  * the control to be rendered outside of the map's viewport.
  */
 
@@ -44,24 +43,26 @@ import {listen, unlistenByKey} from '../events.js';
  * You can also extend this base for your own control class. See
  * examples/custom-controls for an example of how to do this.
  *
- * @constructor
- * @extends {module:ol/Object}
- * @param {module:ol/control/Control~Options} options Control options.
  * @api
  */
-const Control = function(options) {
+class Control extends BaseObject {
 
-  BaseObject.call(this);
+  /**
+   * @param {module:ol/control/Control~Options} options Control options.
+   */
+  constructor(options) {
+
+    super();
 
     /**
      * @protected
-   * @type {Element}
+     * @type {HTMLElement}
      */
     this.element = options.element ? options.element : null;
 
     /**
      * @private
-   * @type {Element}
+     * @type {HTMLElement}
      */
     this.target_ = null;
 
@@ -86,38 +87,33 @@ const Control = function(options) {
       this.setTarget(options.target);
     }
 
-};
+  }
 
-inherits(Control, BaseObject);
-
-
-/**
+  /**
    * @inheritDoc
    */
-Control.prototype.disposeInternal = function() {
+  disposeInternal() {
     removeNode(this.element);
-  BaseObject.prototype.disposeInternal.call(this);
-};
+    super.disposeInternal();
+  }
 
-
-/**
+  /**
    * Get the map associated with this control.
    * @return {module:ol/PluggableMap} Map.
    * @api
    */
-Control.prototype.getMap = function() {
+  getMap() {
     return this.map_;
-};
+  }
 
-
-/**
+  /**
    * Remove the control from its current map and attach it to the new map.
    * Subclasses may set up event handlers to get notified about changes to
    * the map here.
    * @param {module:ol/PluggableMap} map Map.
    * @api
    */
-Control.prototype.setMap = function(map) {
+  setMap(map) {
     if (this.map_) {
       removeNode(this.element);
     }
@@ -136,21 +132,23 @@ Control.prototype.setMap = function(map) {
       }
       map.render();
     }
-};
+  }
 
-
-/**
+  /**
    * This function is used to set a target element for the control. It has no
    * effect if it is called after the control has been added to the map (i.e.
    * after `setMap` is called on the control). If no `target` is set in the
    * options passed to the control constructor and if `setTarget` is not called
    * then the control is added to the map's overlay container.
- * @param {Element|string} target Target.
+   * @param {HTMLElement|string} target Target.
    * @api
    */
-Control.prototype.setTarget = function(target) {
+  setTarget(target) {
     this.target_ = typeof target === 'string' ?
       document.getElementById(target) :
       target;
-};
+  }
+}
+
+
 export default Control;

src/ol/control/FullScreen.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/control/FullScreen
  */
-import {inherits} from '../util.js';
 import Control from '../control/Control.js';
 import {CLASS_CONTROL, CLASS_UNSELECTABLE, CLASS_UNSUPPORTED} from '../css.js';
 import {replaceNode} from '../dom.js';
@@ -35,16 +34,16 @@ const getChangeType = (function() {
 /**
  * @typedef {Object} Options
  * @property {string} [className='ol-full-screen'] CSS class name.
- * @property {string|Element} [label='\u2922'] Text label to use for the button.
+ * @property {string|HTMLElement} [label='\u2922'] Text label to use for the button.
  * Instead of text, also an element (e.g. a `span` element) can be used.
- * @property {string|Element} [labelActive='\u00d7'] Text label to use for the
+ * @property {string|HTMLElement} [labelActive='\u00d7'] Text label to use for the
  * button when full-screen is active.
  * Instead of text, also an element (e.g. a `span` element) can be used.
  * @property {string} [tipLabel='Toggle full-screen'] Text label to use for the button tip.
  * @property {boolean} [keys=false] Full keyboard access.
- * @property {Element|string} [target] Specify a target if you want the
+ * @property {HTMLElement|string} [target] Specify a target if you want the
  * control to be rendered outside of the map's viewport.
- * @property {Element|string} [source] The element to be displayed
+ * @property {HTMLElement|string} [source] The element to be displayed
  * fullscreen. When not provided, the element containing the map viewport will
  * be displayed fullscreen.
  */
@@ -61,16 +60,22 @@ const getChangeType = (function() {
  * The [Fullscreen API](http://www.w3.org/TR/fullscreen/) is used to
  * toggle the map in full screen mode.
  *
- *
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/FullScreen~Options=} opt_options Options.
  * @api
  */
-const FullScreen = function(opt_options) {
+class FullScreen extends Control {
+
+  /**
+   * @param {module:ol/control/FullScreen~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
+    super({
+      element: document.createElement('div'),
+      target: options.target
+    });
+
     /**
      * @private
      * @type {string}
@@ -82,7 +87,7 @@ const FullScreen = function(opt_options) {
 
     /**
      * @private
-   * @type {Element}
+     * @type {HTMLElement}
      */
     this.labelNode_ = typeof label === 'string' ?
       document.createTextNode(label) : label;
@@ -91,7 +96,7 @@ const FullScreen = function(opt_options) {
 
     /**
      * @private
-   * @type {Element}
+     * @type {HTMLElement}
      */
     this.labelActiveNode_ = typeof labelActive === 'string' ?
       document.createTextNode(labelActive) : labelActive;
@@ -109,15 +114,10 @@ const FullScreen = function(opt_options) {
     const cssClasses = this.cssClassName_ + ' ' + CLASS_UNSELECTABLE +
         ' ' + CLASS_CONTROL + ' ' +
         (!isFullScreenSupported() ? CLASS_UNSUPPORTED : '');
-  const element = document.createElement('div');
+    const element = this.element;
     element.className = cssClasses;
     element.appendChild(button);
 
-  Control.call(this, {
-    element: element,
-    target: options.target
-  });
-
     /**
      * @private
      * @type {boolean}
@@ -126,29 +126,25 @@ const FullScreen = function(opt_options) {
 
     /**
      * @private
-   * @type {Element|string|undefined}
+     * @type {HTMLElement|string|undefined}
      */
     this.source_ = options.source;
 
-};
+  }
 
-inherits(FullScreen, Control);
-
-
-/**
- * @param {Event} event The event to handle
+  /**
+   * @param {MouseEvent} event The event to handle
    * @private
    */
-FullScreen.prototype.handleClick_ = function(event) {
+  handleClick_(event) {
     event.preventDefault();
     this.handleFullScreen_();
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-FullScreen.prototype.handleFullScreen_ = function() {
+  handleFullScreen_() {
     if (!isFullScreenSupported()) {
       return;
     }
@@ -174,13 +170,12 @@ FullScreen.prototype.handleFullScreen_ = function() {
         requestFullScreen(element);
       }
     }
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-FullScreen.prototype.handleFullScreenChange_ = function() {
+  handleFullScreenChange_() {
     const button = this.element.firstElementChild;
     const map = this.getMap();
     if (isFullScreen()) {
@@ -193,22 +188,23 @@ FullScreen.prototype.handleFullScreenChange_ = function() {
     if (map) {
       map.updateSize();
     }
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    * @api
    */
-FullScreen.prototype.setMap = function(map) {
-  Control.prototype.setMap.call(this, map);
+  setMap(map) {
+    super.setMap(map);
     if (map) {
       this.listenerKeys.push(listen(document,
         getChangeType(),
         this.handleFullScreenChange_, this)
       );
     }
-};
+  }
+}
+
 
 /**
  * @return {boolean} Fullscreen is supported by the current platform.
@@ -235,7 +231,7 @@ function isFullScreen() {
 
 /**
  * Request to fullscreen an element.
- * @param {Element} element Element to request fullscreen
+ * @param {HTMLElement} element Element to request fullscreen
  */
 function requestFullScreen(element) {
   if (element.requestFullscreen) {
@@ -251,7 +247,7 @@ function requestFullScreen(element) {
 
 /**
  * Request to fullscreen an element with keyboard input.
- * @param {Element} element Element to request fullscreen
+ * @param {HTMLElement} element Element to request fullscreen
  */
 function requestFullScreenWithKeys(element) {
   if (element.mozRequestFullScreenWithKeys) {

src/ol/control/MousePosition.js

@@ -1,8 +1,6 @@
 /**
  * @module ol/control/MousePosition
  */
-
-import {inherits} from '../util.js';
 import {listen} from '../events.js';
 import EventType from '../events/EventType.js';
 import {getChangeEventType} from '../Object.js';
@@ -46,20 +44,21 @@ const COORDINATE_FORMAT = 'coordinateFormat';
  * By default the control is shown in the top right corner of the map, but this
  * can be changed by using the css selector `.ol-mouse-position`.
  *
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/MousePosition~Options=} opt_options Mouse position
- *     options.
  * @api
  */
-const MousePosition = function(opt_options) {
+class MousePosition extends Control {
+
+  /**
+   * @param {module:ol/control/MousePosition~Options=} opt_options Mouse position options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
     const element = document.createElement('DIV');
     element.className = options.className !== undefined ? options.className : 'ol-mouse-position';
 
-  Control.call(this, {
+    super({
       element: element,
       render: options.render || render,
       target: options.target
@@ -108,44 +107,20 @@ const MousePosition = function(opt_options) {
 
     /**
      * @private
-   * @type {module:ol~Pixel}
+     * @type {module:ol/pixel~Pixel}
      */
     this.lastMouseMovePixel_ = null;
 
-};
-
-inherits(MousePosition, Control);
-
-
-/**
- * Update the mouseposition element.
- * @param {module:ol/MapEvent} mapEvent Map event.
- * @this {module:ol/control/MousePosition}
- * @api
- */
-export function render(mapEvent) {
-  const frameState = mapEvent.frameState;
-  if (!frameState) {
-    this.mapProjection_ = null;
-  } else {
-    if (this.mapProjection_ != frameState.viewState.projection) {
-      this.mapProjection_ = frameState.viewState.projection;
-      this.transform_ = null;
   }
-  }
-  this.updateHTML_(this.lastMouseMovePixel_);
-}
 
-
-/**
+  /**
    * @private
    */
-MousePosition.prototype.handleProjectionChanged_ = function() {
+  handleProjectionChanged_() {
     this.transform_ = null;
-};
+  }
 
-
-/**
+  /**
    * Return the coordinate format type used to render the current position or
    * undefined.
    * @return {module:ol/coordinate~CoordinateFormat|undefined} The format to render the current
@@ -153,54 +128,50 @@ MousePosition.prototype.handleProjectionChanged_ = function() {
    * @observable
    * @api
    */
-MousePosition.prototype.getCoordinateFormat = function() {
+  getCoordinateFormat() {
     return (
       /** @type {module:ol/coordinate~CoordinateFormat|undefined} */ (this.get(COORDINATE_FORMAT))
     );
-};
+  }
 
-
-/**
+  /**
    * Return the projection that is used to report the mouse position.
    * @return {module:ol/proj/Projection|undefined} The projection to report mouse
    *     position in.
    * @observable
    * @api
    */
-MousePosition.prototype.getProjection = function() {
+  getProjection() {
     return (
       /** @type {module:ol/proj/Projection|undefined} */ (this.get(PROJECTION))
     );
-};
+  }
 
-
-/**
+  /**
    * @param {Event} event Browser event.
    * @protected
    */
-MousePosition.prototype.handleMouseMove = function(event) {
+  handleMouseMove(event) {
     const map = this.getMap();
     this.lastMouseMovePixel_ = map.getEventPixel(event);
     this.updateHTML_(this.lastMouseMovePixel_);
-};
+  }
 
-
-/**
+  /**
    * @param {Event} event Browser event.
    * @protected
    */
-MousePosition.prototype.handleMouseOut = function(event) {
+  handleMouseOut(event) {
     this.updateHTML_(null);
     this.lastMouseMovePixel_ = null;
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    * @api
    */
-MousePosition.prototype.setMap = function(map) {
-  Control.prototype.setMap.call(this, map);
+  setMap(map) {
+    super.setMap(map);
     if (map) {
       const viewport = map.getViewport();
       this.listenerKeys.push(
@@ -212,38 +183,35 @@ MousePosition.prototype.setMap = function(map) {
         );
       }
     }
-};
+  }
 
-
-/**
+  /**
    * Set the coordinate format type used to render the current position.
    * @param {module:ol/coordinate~CoordinateFormat} format The format to render the current
    *     position in.
    * @observable
    * @api
    */
-MousePosition.prototype.setCoordinateFormat = function(format) {
+  setCoordinateFormat(format) {
     this.set(COORDINATE_FORMAT, format);
-};
+  }
 
-
-/**
+  /**
    * Set the projection that is used to report the mouse position.
    * @param {module:ol/proj~ProjectionLike} projection The projection to report mouse
    *     position in.
    * @observable
    * @api
    */
-MousePosition.prototype.setProjection = function(projection) {
+  setProjection(projection) {
     this.set(PROJECTION, getProjection(projection));
-};
+  }
 
-
-/**
- * @param {?module:ol~Pixel} pixel Pixel.
+  /**
+   * @param {?module:ol/pixel~Pixel} pixel Pixel.
    * @private
    */
-MousePosition.prototype.updateHTML_ = function(pixel) {
+  updateHTML_(pixel) {
     let html = this.undefinedHTML_;
     if (pixel && this.mapProjection_) {
       if (!this.transform_) {
@@ -271,7 +239,28 @@ MousePosition.prototype.updateHTML_ = function(pixel) {
       this.element.innerHTML = html;
       this.renderedHTML_ = html;
     }
-};
+  }
+}
+
+
+/**
+ * Update the mouseposition element.
+ * @param {module:ol/MapEvent} mapEvent Map event.
+ * @this {module:ol/control/MousePosition}
+ * @api
+ */
+export function render(mapEvent) {
+  const frameState = mapEvent.frameState;
+  if (!frameState) {
+    this.mapProjection_ = null;
+  } else {
+    if (this.mapProjection_ != frameState.viewState.projection) {
+      this.mapProjection_ = frameState.viewState.projection;
+      this.transform_ = null;
+    }
+  }
+  this.updateHTML_(this.lastMouseMovePixel_);
+}
 
 
 export default MousePosition;

src/ol/control/OverviewMap.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/control/OverviewMap
  */
-import {inherits} from '../util.js';
 import Collection from '../Collection.js';
 import Map from '../Map.js';
 import MapEventType from '../MapEventType.js';
@@ -40,17 +39,17 @@ const MIN_RATIO = 0.1;
  * @typedef {Object} Options
  * @property {string} [className='ol-overviewmap'] CSS class name.
  * @property {boolean} [collapsed=true] Whether the control should start collapsed or not (expanded).
- * @property {string|Element} [collapseLabel='«'] Text label to use for the
+ * @property {string|HTMLElement} [collapseLabel='«'] Text label to use for the
  * expanded overviewmap button. Instead of text, also an element (e.g. a `span` element) can be used.
  * @property {boolean} [collapsible=true] Whether the control can be collapsed or not.
- * @property {string|Element} [label='»'] Text label to use for the collapsed
+ * @property {string|HTMLElement} [label='»'] Text label to use for the collapsed
  * overviewmap button. Instead of text, also an element (e.g. a `span` element) can be used.
  * @property {Array.<module:ol/layer/Layer>|module:ol/Collection.<module:ol/layer/Layer>} [layers]
  * Layers for the overview map. If not set, then all main map layers are used
  * instead.
  * @property {function(module:ol/MapEvent)} [render] Function called when the control
  * should be re-rendered. This is called in a `requestAnimationFrame` callback.
- * @property {Element|string} [target] Specify a target if you want the control
+ * @property {HTMLElement|string} [target] Specify a target if you want the control
  * to be rendered outside of the map's viewport.
  * @property {string} [tipLabel='Overview map'] Text label to use for the button tip.
  * @property {module:ol/View} [view] Custom view for the overview map. If not provided,
@@ -61,15 +60,24 @@ const MIN_RATIO = 0.1;
 /**
  * Create a new control with a map acting as an overview map for an other
  * defined map.
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/OverviewMap~Options=} opt_options OverviewMap options.
+ *
  * @api
  */
-const OverviewMap = function(opt_options) {
+class OverviewMap extends Control {
+
+  /**
+   * @param {module:ol/control/OverviewMap~Options=} opt_options OverviewMap options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
+    super({
+      element: document.createElement('div'),
+      render: options.render || render,
+      target: options.target
+    });
+
     /**
      * @type {boolean}
      * @private
@@ -96,7 +104,7 @@ const OverviewMap = function(opt_options) {
     if (typeof collapseLabel === 'string') {
       /**
        * @private
-     * @type {Element}
+       * @type {HTMLElement}
        */
       this.collapseLabel_ = document.createElement('span');
       this.collapseLabel_.textContent = collapseLabel;
@@ -110,7 +118,7 @@ const OverviewMap = function(opt_options) {
     if (typeof label === 'string') {
       /**
        * @private
-     * @type {Element}
+       * @type {HTMLElement}
        */
       this.label_ = document.createElement('span');
       this.label_.textContent = label;
@@ -129,7 +137,7 @@ const OverviewMap = function(opt_options) {
       this.handleClick_, this);
 
     /**
-   * @type {Element}
+     * @type {HTMLElement}
      * @private
      */
     this.ovmapDiv_ = document.createElement('DIV');
@@ -174,17 +182,11 @@ const OverviewMap = function(opt_options) {
     const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL +
         (this.collapsed_ && this.collapsible_ ? ' ' + CLASS_COLLAPSED : '') +
         (this.collapsible_ ? '' : ' ol-uncollapsible');
-  const element = document.createElement('div');
+    const element = this.element;
     element.className = cssClasses;
     element.appendChild(this.ovmapDiv_);
     element.appendChild(button);
 
-  Control.call(this, {
-    element: element,
-    render: options.render || render,
-    target: options.target
-  });
-
     /* Interactive map */
 
     const scope = this;
@@ -222,16 +224,13 @@ const OverviewMap = function(opt_options) {
       window.addEventListener('mousemove', move);
       window.addEventListener('mouseup', endMoving);
     });
-};
+  }
 
-inherits(OverviewMap, Control);
-
-
-/**
+  /**
    * @inheritDoc
    * @api
    */
-OverviewMap.prototype.setMap = function(map) {
+  setMap(map) {
     const oldMap = this.getMap();
     if (map === oldMap) {
       return;
@@ -243,7 +242,7 @@ OverviewMap.prototype.setMap = function(map) {
       }
       this.ovmap_.setTarget(null);
     }
-  Control.prototype.setMap.call(this, map);
+    super.setMap(map);
 
     if (map) {
       this.ovmap_.setTarget(this.ovmapDiv_);
@@ -265,15 +264,14 @@ OverviewMap.prototype.setMap = function(map) {
         }
       }
     }
-};
+  }
 
-
-/**
+  /**
    * Handle map property changes.  This only deals with changes to the map's view.
    * @param {module:ol/Object~ObjectEvent} event The propertychange event.
    * @private
    */
-OverviewMap.prototype.handleMapPropertyChange_ = function(event) {
+  handleMapPropertyChange_(event) {
     if (event.key === MapProperty.VIEW) {
       const oldView = /** @type {module:ol/View} */ (event.oldValue);
       if (oldView) {
@@ -282,57 +280,41 @@ OverviewMap.prototype.handleMapPropertyChange_ = function(event) {
       const newView = this.getMap().getView();
       this.bindView_(newView);
     }
-};
+  }
 
-
-/**
+  /**
    * Register listeners for view property changes.
    * @param {module:ol/View} view The view.
    * @private
    */
-OverviewMap.prototype.bindView_ = function(view) {
+  bindView_(view) {
     listen(view,
       getChangeEventType(ViewProperty.ROTATION),
       this.handleRotationChanged_, this);
-};
+  }
 
-
-/**
+  /**
    * Unregister listeners for view property changes.
    * @param {module:ol/View} view The view.
    * @private
    */
-OverviewMap.prototype.unbindView_ = function(view) {
+  unbindView_(view) {
     unlisten(view,
       getChangeEventType(ViewProperty.ROTATION),
       this.handleRotationChanged_, this);
-};
+  }
 
-
-/**
+  /**
    * Handle rotation changes to the main map.
    * TODO: This should rotate the extent rectrangle instead of the
    * overview map's view.
    * @private
    */
-OverviewMap.prototype.handleRotationChanged_ = function() {
+  handleRotationChanged_() {
     this.ovmap_.getView().setRotation(this.getMap().getView().getRotation());
-};
+  }
 
-
-/**
- * Update the overview map element.
- * @param {module:ol/MapEvent} mapEvent Map event.
- * @this {module:ol/control/OverviewMap}
- * @api
- */
-export function render(mapEvent) {
-  this.validateExtent_();
-  this.updateBox_();
-}
-
-
-/**
+  /**
    * Reset the overview map extent if the box size (width or
    * height) is less than the size of the overview map size times minRatio
    * or is greater than the size of the overview size times maxRatio.
@@ -343,7 +325,7 @@ export function render(mapEvent) {
    * main map center location.
    * @private
    */
-OverviewMap.prototype.validateExtent_ = function() {
+  validateExtent_() {
     const map = this.getMap();
     const ovmap = this.ovmap_;
 
@@ -380,15 +362,14 @@ OverviewMap.prototype.validateExtent_ = function() {
     } else if (!containsExtent(ovextent, extent)) {
       this.recenter_();
     }
-};
+  }
 
-
-/**
+  /**
    * Reset the overview map extent to half calculated min and max ratio times
    * the extent of the main map.
    * @private
    */
-OverviewMap.prototype.resetExtent_ = function() {
+  resetExtent_() {
     if (MAX_RATIO === 0 || MIN_RATIO === 0) {
       return;
     }
@@ -411,15 +392,14 @@ OverviewMap.prototype.resetExtent_ = function() {
     const ratio = 1 / (Math.pow(2, steps / 2) * MIN_RATIO);
     scaleFromCenter(extent, ratio);
     ovview.fit(extent);
-};
+  }
 
-
-/**
+  /**
    * Set the center of the overview map to the map center without changing its
    * resolution.
    * @private
    */
-OverviewMap.prototype.recenter_ = function() {
+  recenter_() {
     const map = this.getMap();
     const ovmap = this.ovmap_;
 
@@ -428,14 +408,13 @@ OverviewMap.prototype.recenter_ = function() {
     const ovview = ovmap.getView();
 
     ovview.setCenter(view.getCenter());
-};
+  }
 
-
-/**
+  /**
    * Update the box using the main map extent
    * @private
    */
-OverviewMap.prototype.updateBox_ = function() {
+  updateBox_() {
     const map = this.getMap();
     const ovmap = this.ovmap_;
 
@@ -467,17 +446,15 @@ OverviewMap.prototype.updateBox_ = function() {
       box.style.width = Math.abs((bottomLeft[0] - topRight[0]) / ovresolution) + 'px';
       box.style.height = Math.abs((topRight[1] - bottomLeft[1]) / ovresolution) + 'px';
     }
-};
+  }
 
-
-/**
+  /**
    * @param {number} rotation Target rotation.
    * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.
    * @return {module:ol/coordinate~Coordinate|undefined} Coordinate for rotation and center anchor.
    * @private
    */
-OverviewMap.prototype.calculateCoordinateRotate_ = function(
-  rotation, coordinate) {
+  calculateCoordinateRotate_(rotation, coordinate) {
     let coordinateRotate;
 
     const map = this.getMap();
@@ -494,23 +471,21 @@ OverviewMap.prototype.calculateCoordinateRotate_ = function(
       addCoordinate(coordinateRotate, currentCenter);
     }
     return coordinateRotate;
-};
+  }
 
-
-/**
- * @param {Event} event The event to handle
+  /**
+   * @param {MouseEvent} event The event to handle
    * @private
    */
-OverviewMap.prototype.handleClick_ = function(event) {
+  handleClick_(event) {
     event.preventDefault();
     this.handleToggle_();
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-OverviewMap.prototype.handleToggle_ = function() {
+  handleToggle_() {
     this.element.classList.toggle(CLASS_COLLAPSED);
     if (this.collapsed_) {
       replaceNode(this.collapseLabel_, this.label_);
@@ -531,25 +506,23 @@ OverviewMap.prototype.handleToggle_ = function() {
         },
         this);
     }
-};
+  }
 
-
-/**
+  /**
    * Return `true` if the overview map is collapsible, `false` otherwise.
    * @return {boolean} True if the widget is collapsible.
    * @api
    */
-OverviewMap.prototype.getCollapsible = function() {
+  getCollapsible() {
     return this.collapsible_;
-};
+  }
 
-
-/**
+  /**
    * Set whether the overview map should be collapsible.
    * @param {boolean} collapsible True if the widget is collapsible.
    * @api
    */
-OverviewMap.prototype.setCollapsible = function(collapsible) {
+  setCollapsible(collapsible) {
     if (this.collapsible_ === collapsible) {
       return;
     }
@@ -558,40 +531,52 @@ OverviewMap.prototype.setCollapsible = function(collapsible) {
     if (!collapsible && this.collapsed_) {
       this.handleToggle_();
     }
-};
+  }
 
-
-/**
+  /**
    * Collapse or expand the overview map according to the passed parameter. Will
    * not do anything if the overview map isn't collapsible or if the current
    * collapsed state is already the one requested.
    * @param {boolean} collapsed True if the widget is collapsed.
    * @api
    */
-OverviewMap.prototype.setCollapsed = function(collapsed) {
+  setCollapsed(collapsed) {
     if (!this.collapsible_ || this.collapsed_ === collapsed) {
       return;
     }
     this.handleToggle_();
-};
+  }
 
-
-/**
+  /**
    * Determine if the overview map is collapsed.
    * @return {boolean} The overview map is collapsed.
    * @api
    */
-OverviewMap.prototype.getCollapsed = function() {
+  getCollapsed() {
     return this.collapsed_;
-};
+  }
 
-
-/**
+  /**
    * Return the overview map.
    * @return {module:ol/PluggableMap} Overview map.
    * @api
    */
-OverviewMap.prototype.getOverviewMap = function() {
+  getOverviewMap() {
     return this.ovmap_;
-};
+  }
+}
+
+
+/**
+ * Update the overview map element.
+ * @param {module:ol/MapEvent} mapEvent Map event.
+ * @this {module:ol/control/OverviewMap}
+ * @api
+ */
+export function render(mapEvent) {
+  this.validateExtent_();
+  this.updateBox_();
+}
+
+
 export default OverviewMap;

src/ol/control/Rotate.js

@@ -1,19 +1,17 @@
 /**
  * @module ol/control/Rotate
  */
-
 import Control from '../control/Control.js';
 import {CLASS_CONTROL, CLASS_HIDDEN, CLASS_UNSELECTABLE} from '../css.js';
 import {easeOut} from '../easing.js';
 import {listen} from '../events.js';
 import EventType from '../events/EventType.js';
-import {inherits} from '../util.js';
 
 
 /**
  * @typedef {Object} Options
  * @property {string} [className='ol-rotate'] CSS class name.
- * @property {string|Element} [label='⇧'] Text label to use for the rotate button.
+ * @property {string|HTMLElement} [label='⇧'] Text label to use for the rotate button.
  * Instead of text, also an element (e.g. a `span` element) can be used.
  * @property {string} [tipLabel='Reset rotation'] Text label to use for the rotate tip.
  * @property {number} [duration=250] Animation duration in milliseconds.
@@ -22,7 +20,7 @@ import {inherits} from '../util.js';
  * be re-rendered. This is called in a `requestAnimationFrame` callback.
  * @property {function()} [resetNorth] Function called when the control is clicked.
  * This will override the default `resetNorth`.
- * @property {Element|string} [target] Specify a target if you want the control to be
+ * @property {HTMLElement|string} [target] Specify a target if you want the control to be
  * rendered outside of the map's viewport.
  */
 
@@ -33,21 +31,29 @@ import {inherits} from '../util.js';
  * To style this control use css selector `.ol-rotate`. A `.ol-hidden` css
  * selector is added to the button when the rotation is 0.
  *
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/Rotate~Options=} opt_options Rotate options.
  * @api
  */
-const Rotate = function(opt_options) {
+class Rotate extends Control {
+
+  /**
+   * @param {module:ol/control/Rotate~Options=} opt_options Rotate options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
+    super({
+      element: document.createElement('div'),
+      render: options.render || render,
+      target: options.target
+    });
+
     const className = options.className !== undefined ? options.className : 'ol-rotate';
 
     const label = options.label !== undefined ? options.label : '\u21E7';
 
     /**
-   * @type {Element}
+     * @type {HTMLElement}
      * @private
      */
     this.label_ = null;
@@ -69,22 +75,15 @@ const Rotate = function(opt_options) {
     button.title = tipLabel;
     button.appendChild(this.label_);
 
-  listen(button, EventType.CLICK,
-    Rotate.prototype.handleClick_, this);
+    listen(button, EventType.CLICK, this.handleClick_, this);
 
     const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;
-  const element = document.createElement('div');
+    const element = this.element;
     element.className = cssClasses;
     element.appendChild(button);
 
     this.callResetNorth_ = options.resetNorth ? options.resetNorth : undefined;
 
-  Control.call(this, {
-    element: element,
-    render: options.render || render,
-    target: options.target
-  });
-
     /**
      * @type {number}
      * @private
@@ -107,29 +106,25 @@ const Rotate = function(opt_options) {
       this.element.classList.add(CLASS_HIDDEN);
     }
 
-};
+  }
 
-inherits(Rotate, Control);
-
-
-/**
- * @param {Event} event The event to handle
+  /**
+   * @param {MouseEvent} event The event to handle
    * @private
    */
-Rotate.prototype.handleClick_ = function(event) {
+  handleClick_(event) {
     event.preventDefault();
     if (this.callResetNorth_ !== undefined) {
       this.callResetNorth_();
     } else {
       this.resetNorth_();
     }
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-Rotate.prototype.resetNorth_ = function() {
+  resetNorth_() {
     const map = this.getMap();
     const view = map.getView();
     if (!view) {
@@ -148,7 +143,8 @@ Rotate.prototype.resetNorth_ = function() {
         view.setRotation(0);
       }
     }
-};
+  }
+}
 
 
 /**

src/ol/control/ScaleLine.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/control/ScaleLine
  */
-import {inherits} from '../util.js';
 import {getChangeEventType} from '../Object.js';
 import {assert} from '../asserts.js';
 import Control from '../control/Control.js';
@@ -43,7 +42,7 @@ const LEADING_DIGITS = [1, 2, 5];
  * @property {number} [minWidth=64] Minimum width in pixels.
  * @property {function(module:ol/MapEvent)} [render] Function called when the control
  * should be re-rendered. This is called in a `requestAnimationFrame` callback.
- * @property {Element|string} [target] Specify a target if you want the control
+ * @property {HTMLElement|string} [target] Specify a target if you want the control
  * to be rendered outside of the map's viewport.
  * @property {module:ol/control/ScaleLine~Units|string} [units='metric'] Units.
  */
@@ -59,31 +58,34 @@ const LEADING_DIGITS = [1, 2, 5];
  * By default the scale line will show in the bottom left portion of the map,
  * but this can be changed by using the css selector `.ol-scale-line`.
  *
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/ScaleLine~Options=} opt_options Scale line options.
  * @api
  */
-const ScaleLine = function(opt_options) {
+class ScaleLine extends Control {
+
+  /**
+   * @param {module:ol/control/ScaleLine~Options=} opt_options Scale line options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
     const className = options.className !== undefined ? options.className : 'ol-scale-line';
 
+    super({
+      element: document.createElement('DIV'),
+      render: options.render || render,
+      target: options.target
+    });
+
     /**
      * @private
-   * @type {Element}
+     * @type {HTMLElement}
      */
     this.innerElement_ = document.createElement('DIV');
     this.innerElement_.className = className + '-inner';
 
-  /**
-   * @private
-   * @type {Element}
-   */
-  this.element_ = document.createElement('DIV');
-  this.element_.className = className + ' ' + CLASS_UNSELECTABLE;
-  this.element_.appendChild(this.innerElement_);
+    this.element.className = className + ' ' + CLASS_UNSELECTABLE;
+    this.element.appendChild(this.innerElement_);
 
     /**
      * @private
@@ -115,12 +117,6 @@ const ScaleLine = function(opt_options) {
      */
     this.renderedHTML_ = '';
 
-  Control.call(this, {
-    element: this.element_,
-    render: options.render || render,
-    target: options.target
-  });
-
     listen(
       this, getChangeEventType(UNITS_PROP),
       this.handleUnitsChanged_, this);
@@ -128,70 +124,47 @@ const ScaleLine = function(opt_options) {
     this.setUnits(/** @type {module:ol/control/ScaleLine~Units} */ (options.units) ||
         Units.METRIC);
 
-};
+  }
 
-inherits(ScaleLine, Control);
-
-
-/**
+  /**
    * Return the units to use in the scale line.
    * @return {module:ol/control/ScaleLine~Units|undefined} The units
    * to use in the scale line.
    * @observable
    * @api
    */
-ScaleLine.prototype.getUnits = function() {
+  getUnits() {
     return (
       /** @type {module:ol/control/ScaleLine~Units|undefined} */ (this.get(UNITS_PROP))
     );
-};
-
-
-/**
- * Update the scale line element.
- * @param {module:ol/MapEvent} mapEvent Map event.
- * @this {module:ol/control/ScaleLine}
- * @api
- */
-export function render(mapEvent) {
-  const frameState = mapEvent.frameState;
-  if (!frameState) {
-    this.viewState_ = null;
-  } else {
-    this.viewState_ = frameState.viewState;
   }
-  this.updateElement_();
-}
 
-
-/**
+  /**
    * @private
    */
-ScaleLine.prototype.handleUnitsChanged_ = function() {
+  handleUnitsChanged_() {
     this.updateElement_();
-};
+  }
 
-
-/**
+  /**
    * Set the units to use in the scale line.
    * @param {module:ol/control/ScaleLine~Units} units The units to use in the scale line.
    * @observable
    * @api
    */
-ScaleLine.prototype.setUnits = function(units) {
+  setUnits(units) {
     this.set(UNITS_PROP, units);
-};
+  }
 
-
-/**
+  /**
    * @private
    */
-ScaleLine.prototype.updateElement_ = function() {
+  updateElement_() {
     const viewState = this.viewState_;
 
     if (!viewState) {
       if (this.renderedVisible_) {
-      this.element_.style.display = 'none';
+        this.element.style.display = 'none';
         this.renderedVisible_ = false;
       }
       return;
@@ -278,7 +251,7 @@ ScaleLine.prototype.updateElement_ = function() {
           Math.pow(10, Math.floor(i / 3));
       width = Math.round(count / pointResolution);
       if (isNaN(width)) {
-      this.element_.style.display = 'none';
+        this.element.style.display = 'none';
         this.renderedVisible_ = false;
         return;
       } else if (width >= this.minWidth_) {
@@ -299,10 +272,29 @@ ScaleLine.prototype.updateElement_ = function() {
     }
 
     if (!this.renderedVisible_) {
-    this.element_.style.display = '';
+      this.element.style.display = '';
       this.renderedVisible_ = true;
     }
 
-};
+  }
+}
+
+
+/**
+ * Update the scale line element.
+ * @param {module:ol/MapEvent} mapEvent Map event.
+ * @this {module:ol/control/ScaleLine}
+ * @api
+ */
+export function render(mapEvent) {
+  const frameState = mapEvent.frameState;
+  if (!frameState) {
+    this.viewState_ = null;
+  } else {
+    this.viewState_ = frameState.viewState;
+  }
+  this.updateElement_();
+}
+
 
 export default ScaleLine;

src/ol/control/Zoom.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/control/Zoom
  */
-import {inherits} from '../util.js';
 import {listen} from '../events.js';
 import EventType from '../events/EventType.js';
 import Control from '../control/Control.js';
@@ -13,14 +12,14 @@ import {easeOut} from '../easing.js';
  * @typedef {Object} Options
  * @property {number} [duration=250] Animation duration in milliseconds.
  * @property {string} [className='ol-zoom'] CSS class name.
- * @property {string|Element} [zoomInLabel='+'] Text label to use for the zoom-in
+ * @property {string|HTMLElement} [zoomInLabel='+'] Text label to use for the zoom-in
  * button. Instead of text, also an element (e.g. a `span` element) can be used.
- * @property {string|Element} [zoomOutLabel='-'] Text label to use for the zoom-out button.
+ * @property {string|HTMLElement} [zoomOutLabel='-'] Text label to use for the zoom-out button.
  * Instead of text, also an element (e.g. a `span` element) can be used.
  * @property {string} [zoomInTipLabel='Zoom in'] Text label to use for the button tip.
  * @property {string} [zoomOutTipLabel='Zoom out'] Text label to use for the button tip.
  * @property {number} [delta=1] The zoom delta applied on each click.
- * @property {Element|string} [target] Specify a target if you want the control to be
+ * @property {HTMLElement|string} [target] Specify a target if you want the control to be
  * rendered outside of the map's viewport.
  */
 
@@ -31,15 +30,22 @@ import {easeOut} from '../easing.js';
  * This control is one of the default controls of a map. To style this control
  * use css selectors `.ol-zoom-in` and `.ol-zoom-out`.
  *
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/Zoom~Options=} opt_options Zoom options.
  * @api
  */
-const Zoom = function(opt_options) {
+class Zoom extends Control {
+
+  /**
+   * @param {module:ol/control/Zoom~Options=} opt_options Zoom options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
+    super({
+      element: document.createElement('div'),
+      target: options.target
+    });
+
     const className = options.className !== undefined ? options.className : 'ol-zoom';
 
     const delta = options.delta !== undefined ? options.delta : 1;
@@ -60,8 +66,7 @@ const Zoom = function(opt_options) {
       typeof zoomInLabel === 'string' ? document.createTextNode(zoomInLabel) : zoomInLabel
     );
 
-  listen(inElement, EventType.CLICK,
-    Zoom.prototype.handleClick_.bind(this, delta));
+    listen(inElement, EventType.CLICK, this.handleClick_.bind(this, delta));
 
     const outElement = document.createElement('button');
     outElement.className = className + '-out';
@@ -71,47 +76,37 @@ const Zoom = function(opt_options) {
       typeof zoomOutLabel === 'string' ? document.createTextNode(zoomOutLabel) : zoomOutLabel
     );
 
-  listen(outElement, EventType.CLICK,
-    Zoom.prototype.handleClick_.bind(this, -delta));
+    listen(outElement, EventType.CLICK, this.handleClick_.bind(this, -delta));
 
     const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;
-  const element = document.createElement('div');
+    const element = this.element;
     element.className = cssClasses;
     element.appendChild(inElement);
     element.appendChild(outElement);
 
-  Control.call(this, {
-    element: element,
-    target: options.target
-  });
-
     /**
      * @type {number}
      * @private
      */
     this.duration_ = options.duration !== undefined ? options.duration : 250;
 
-};
+  }
 
-inherits(Zoom, Control);
-
-
-/**
+  /**
    * @param {number} delta Zoom delta.
- * @param {Event} event The event to handle
+   * @param {MouseEvent} event The event to handle
    * @private
    */
-Zoom.prototype.handleClick_ = function(delta, event) {
+  handleClick_(delta, event) {
     event.preventDefault();
     this.zoomByDelta_(delta);
-};
+  }
 
-
-/**
+  /**
    * @param {number} delta Zoom delta.
    * @private
    */
-Zoom.prototype.zoomByDelta_ = function(delta) {
+  zoomByDelta_(delta) {
     const map = this.getMap();
     const view = map.getView();
     if (!view) {
@@ -135,5 +130,8 @@ Zoom.prototype.zoomByDelta_ = function(delta) {
         view.setResolution(newResolution);
       }
     }
-};
+  }
+}
+
+
 export default Zoom;

src/ol/control/ZoomSlider.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/control/ZoomSlider
  */
-import {inherits} from '../util.js';
 import ViewHint from '../ViewHint.js';
 import Control from '../control/Control.js';
 import {CLASS_CONTROL, CLASS_UNSELECTABLE} from '../css.js';
@@ -42,15 +41,22 @@ const Direction = {
  *
  *     map.addControl(new ZoomSlider());
  *
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/ZoomSlider~Options=} opt_options Zoom slider options.
  * @api
  */
-const ZoomSlider = function(opt_options) {
+class ZoomSlider extends Control {
+
+  /**
+   * @param {module:ol/control/ZoomSlider~Options=} opt_options Zoom slider options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
+    super({
+      element: document.createElement('div'),
+      render: options.render || render
+    });
+
     /**
      * Will hold the current resolution of the view.
      *
@@ -123,7 +129,7 @@ const ZoomSlider = function(opt_options) {
     const thumbElement = document.createElement('button');
     thumbElement.setAttribute('type', 'button');
     thumbElement.className = className + '-thumb ' + CLASS_UNSELECTABLE;
-  const containerElement = document.createElement('div');
+    const containerElement = this.element;
     containerElement.className = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;
     containerElement.appendChild(thumbElement);
     /**
@@ -141,50 +147,40 @@ const ZoomSlider = function(opt_options) {
 
     listen(containerElement, EventType.CLICK, this.handleContainerClick_, this);
     listen(thumbElement, EventType.CLICK, stopPropagation);
+  }
 
-  Control.call(this, {
-    element: containerElement,
-    render: options.render || render
-  });
-};
-
-inherits(ZoomSlider, Control);
-
-
-/**
+  /**
    * @inheritDoc
    */
-ZoomSlider.prototype.disposeInternal = function() {
+  disposeInternal() {
     this.dragger_.dispose();
-  Control.prototype.disposeInternal.call(this);
-};
+    super.disposeInternal();
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-ZoomSlider.prototype.setMap = function(map) {
-  Control.prototype.setMap.call(this, map);
+  setMap(map) {
+    super.setMap(map);
     if (map) {
       map.render();
     }
-};
+  }
 
-
-/**
+  /**
    * Initializes the slider element. This will determine and set this controls
    * direction_ and also constrain the dragging of the thumb to always be within
    * the bounds of the container.
    *
    * @private
    */
-ZoomSlider.prototype.initSlider_ = function() {
+  initSlider_() {
     const container = this.element;
     const containerSize = {
       width: container.offsetWidth, height: container.offsetHeight
     };
 
-  const thumb = container.firstElementChild;
+    const thumb = /** @type {HTMLElement} */ (container.firstElementChild);
     const computedStyle = getComputedStyle(thumb);
     const thumbWidth = thumb.offsetWidth +
         parseFloat(computedStyle['marginRight']) +
@@ -202,7 +198,148 @@ ZoomSlider.prototype.initSlider_ = function() {
       this.heightLimit_ = containerSize.height - thumbHeight;
     }
     this.sliderInitialized_ = true;
-};
+  }
+
+  /**
+   * @param {MouseEvent} event The browser event to handle.
+   * @private
+   */
+  handleContainerClick_(event) {
+    const view = this.getMap().getView();
+
+    const relativePosition = this.getRelativePosition_(
+      event.offsetX - this.thumbSize_[0] / 2,
+      event.offsetY - this.thumbSize_[1] / 2);
+
+    const resolution = this.getResolutionForPosition_(relativePosition);
+
+    view.animate({
+      resolution: view.constrainResolution(resolution),
+      duration: this.duration_,
+      easing: easeOut
+    });
+  }
+
+  /**
+   * Handle dragger start events.
+   * @param {module:ol/pointer/PointerEvent} event The drag event.
+   * @private
+   */
+  handleDraggerStart_(event) {
+    if (!this.dragging_ && event.originalEvent.target === this.element.firstElementChild) {
+      this.getMap().getView().setHint(ViewHint.INTERACTING, 1);
+      this.previousX_ = event.clientX;
+      this.previousY_ = event.clientY;
+      this.dragging_ = true;
+    }
+  }
+
+  /**
+   * Handle dragger drag events.
+   *
+   * @param {module:ol/pointer/PointerEvent|Event} event The drag event.
+   * @private
+   */
+  handleDraggerDrag_(event) {
+    if (this.dragging_) {
+      const element = /** @type {HTMLElement} */ (this.element.firstElementChild);
+      const deltaX = event.clientX - this.previousX_ + parseInt(element.style.left, 10);
+      const deltaY = event.clientY - this.previousY_ + parseInt(element.style.top, 10);
+      const relativePosition = this.getRelativePosition_(deltaX, deltaY);
+      this.currentResolution_ = this.getResolutionForPosition_(relativePosition);
+      this.getMap().getView().setResolution(this.currentResolution_);
+      this.setThumbPosition_(this.currentResolution_);
+      this.previousX_ = event.clientX;
+      this.previousY_ = event.clientY;
+    }
+  }
+
+  /**
+   * Handle dragger end events.
+   * @param {module:ol/pointer/PointerEvent|Event} event The drag event.
+   * @private
+   */
+  handleDraggerEnd_(event) {
+    if (this.dragging_) {
+      const view = this.getMap().getView();
+      view.setHint(ViewHint.INTERACTING, -1);
+
+      view.animate({
+        resolution: view.constrainResolution(this.currentResolution_),
+        duration: this.duration_,
+        easing: easeOut
+      });
+
+      this.dragging_ = false;
+      this.previousX_ = undefined;
+      this.previousY_ = undefined;
+    }
+  }
+
+  /**
+   * Positions the thumb inside its container according to the given resolution.
+   *
+   * @param {number} res The res.
+   * @private
+   */
+  setThumbPosition_(res) {
+    const position = this.getPositionForResolution_(res);
+    const thumb = /** @type {HTMLElement} */ (this.element.firstElementChild);
+
+    if (this.direction_ == Direction.HORIZONTAL) {
+      thumb.style.left = this.widthLimit_ * position + 'px';
+    } else {
+      thumb.style.top = this.heightLimit_ * position + 'px';
+    }
+  }
+
+  /**
+   * Calculates the relative position of the thumb given x and y offsets.  The
+   * relative position scales from 0 to 1.  The x and y offsets are assumed to be
+   * in pixel units within the dragger limits.
+   *
+   * @param {number} x Pixel position relative to the left of the slider.
+   * @param {number} y Pixel position relative to the top of the slider.
+   * @return {number} The relative position of the thumb.
+   * @private
+   */
+  getRelativePosition_(x, y) {
+    let amount;
+    if (this.direction_ === Direction.HORIZONTAL) {
+      amount = x / this.widthLimit_;
+    } else {
+      amount = y / this.heightLimit_;
+    }
+    return clamp(amount, 0, 1);
+  }
+
+  /**
+   * Calculates the corresponding resolution of the thumb given its relative
+   * position (where 0 is the minimum and 1 is the maximum).
+   *
+   * @param {number} position The relative position of the thumb.
+   * @return {number} The corresponding resolution.
+   * @private
+   */
+  getResolutionForPosition_(position) {
+    const fn = this.getMap().getView().getResolutionForValueFunction();
+    return fn(1 - position);
+  }
+
+  /**
+   * Determines the relative position of the slider for the given resolution.  A
+   * relative position of 0 corresponds to the minimum view resolution.  A
+   * relative position of 1 corresponds to the maximum view resolution.
+   *
+   * @param {number} res The resolution.
+   * @return {number} The relative position value (between 0 and 1).
+   * @private
+   */
+  getPositionForResolution_(res) {
+    const fn = this.getMap().getView().getValueForResolutionFunction();
+    return 1 - fn(res);
+  }
+}
 
 
 /**
@@ -226,151 +363,4 @@ export function render(mapEvent) {
 }
 
 
-/**
- * @param {Event} event The browser event to handle.
- * @private
- */
-ZoomSlider.prototype.handleContainerClick_ = function(event) {
-  const view = this.getMap().getView();
-
-  const relativePosition = this.getRelativePosition_(
-    event.offsetX - this.thumbSize_[0] / 2,
-    event.offsetY - this.thumbSize_[1] / 2);
-
-  const resolution = this.getResolutionForPosition_(relativePosition);
-
-  view.animate({
-    resolution: view.constrainResolution(resolution),
-    duration: this.duration_,
-    easing: easeOut
-  });
-};
-
-
-/**
- * Handle dragger start events.
- * @param {module:ol/pointer/PointerEvent} event The drag event.
- * @private
- */
-ZoomSlider.prototype.handleDraggerStart_ = function(event) {
-  if (!this.dragging_ && event.originalEvent.target === this.element.firstElementChild) {
-    this.getMap().getView().setHint(ViewHint.INTERACTING, 1);
-    this.previousX_ = event.clientX;
-    this.previousY_ = event.clientY;
-    this.dragging_ = true;
-  }
-};
-
-
-/**
- * Handle dragger drag events.
- *
- * @param {module:ol/pointer/PointerEvent|Event} event The drag event.
- * @private
- */
-ZoomSlider.prototype.handleDraggerDrag_ = function(event) {
-  if (this.dragging_) {
-    const element = this.element.firstElementChild;
-    const deltaX = event.clientX - this.previousX_ + parseInt(element.style.left, 10);
-    const deltaY = event.clientY - this.previousY_ + parseInt(element.style.top, 10);
-    const relativePosition = this.getRelativePosition_(deltaX, deltaY);
-    this.currentResolution_ = this.getResolutionForPosition_(relativePosition);
-    this.getMap().getView().setResolution(this.currentResolution_);
-    this.setThumbPosition_(this.currentResolution_);
-    this.previousX_ = event.clientX;
-    this.previousY_ = event.clientY;
-  }
-};
-
-
-/**
- * Handle dragger end events.
- * @param {module:ol/pointer/PointerEvent|Event} event The drag event.
- * @private
- */
-ZoomSlider.prototype.handleDraggerEnd_ = function(event) {
-  if (this.dragging_) {
-    const view = this.getMap().getView();
-    view.setHint(ViewHint.INTERACTING, -1);
-
-    view.animate({
-      resolution: view.constrainResolution(this.currentResolution_),
-      duration: this.duration_,
-      easing: easeOut
-    });
-
-    this.dragging_ = false;
-    this.previousX_ = undefined;
-    this.previousY_ = undefined;
-  }
-};
-
-
-/**
- * Positions the thumb inside its container according to the given resolution.
- *
- * @param {number} res The res.
- * @private
- */
-ZoomSlider.prototype.setThumbPosition_ = function(res) {
-  const position = this.getPositionForResolution_(res);
-  const thumb = this.element.firstElementChild;
-
-  if (this.direction_ == Direction.HORIZONTAL) {
-    thumb.style.left = this.widthLimit_ * position + 'px';
-  } else {
-    thumb.style.top = this.heightLimit_ * position + 'px';
-  }
-};
-
-
-/**
- * Calculates the relative position of the thumb given x and y offsets.  The
- * relative position scales from 0 to 1.  The x and y offsets are assumed to be
- * in pixel units within the dragger limits.
- *
- * @param {number} x Pixel position relative to the left of the slider.
- * @param {number} y Pixel position relative to the top of the slider.
- * @return {number} The relative position of the thumb.
- * @private
- */
-ZoomSlider.prototype.getRelativePosition_ = function(x, y) {
-  let amount;
-  if (this.direction_ === Direction.HORIZONTAL) {
-    amount = x / this.widthLimit_;
-  } else {
-    amount = y / this.heightLimit_;
-  }
-  return clamp(amount, 0, 1);
-};
-
-
-/**
- * Calculates the corresponding resolution of the thumb given its relative
- * position (where 0 is the minimum and 1 is the maximum).
- *
- * @param {number} position The relative position of the thumb.
- * @return {number} The corresponding resolution.
- * @private
- */
-ZoomSlider.prototype.getResolutionForPosition_ = function(position) {
-  const fn = this.getMap().getView().getResolutionForValueFunction();
-  return fn(1 - position);
-};
-
-
-/**
- * Determines the relative position of the slider for the given resolution.  A
- * relative position of 0 corresponds to the minimum view resolution.  A
- * relative position of 1 corresponds to the maximum view resolution.
- *
- * @param {number} res The resolution.
- * @return {number} The relative position value (between 0 and 1).
- * @private
- */
-ZoomSlider.prototype.getPositionForResolution_ = function(res) {
-  const fn = this.getMap().getView().getValueForResolutionFunction();
-  return 1 - fn(res);
-};
-
 export default ZoomSlider;

src/ol/control/ZoomToExtent.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/control/ZoomToExtent
  */
-import {inherits} from '../util.js';
 import {listen} from '../events.js';
 import EventType from '../events/EventType.js';
 import Control from '../control/Control.js';
@@ -11,9 +10,9 @@ import {CLASS_CONTROL, CLASS_UNSELECTABLE} from '../css.js';
 /**
  * @typedef {Object} Options
  * @property {string} [className='ol-zoom-extent'] Class name.
- * @property {Element|string} [target] Specify a target if you want the control
+ * @property {HTMLElement|string} [target] Specify a target if you want the control
  * to be rendered outside of the map's viewport.
- * @property {string|Element} [label='E'] Text label to use for the button.
+ * @property {string|HTMLElement} [label='E'] Text label to use for the button.
  * Instead of text, also an element (e.g. a `span` element) can be used.
  * @property {string} [tipLabel='Fit to extent'] Text label to use for the button tip.
  * @property {module:ol/extent~Extent} [extent] The extent to zoom to. If undefined the validity
@@ -26,14 +25,21 @@ import {CLASS_CONTROL, CLASS_UNSELECTABLE} from '../css.js';
  * A button control which, when pressed, changes the map view to a specific
  * extent. To style this control use the css selector `.ol-zoom-extent`.
  *
- * @constructor
- * @extends {module:ol/control/Control}
- * @param {module:ol/control/ZoomToExtent~Options=} opt_options Options.
  * @api
  */
-const ZoomToExtent = function(opt_options) {
+class ZoomToExtent extends Control {
+
+  /**
+   * @param {module:ol/control/ZoomToExtent~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
     const options = opt_options ? opt_options : {};
 
+    super({
+      element: document.createElement('div'),
+      target: options.target
+    });
+
     /**
      * @type {module:ol/extent~Extent}
      * @protected
@@ -54,36 +60,29 @@ const ZoomToExtent = function(opt_options) {
     listen(button, EventType.CLICK, this.handleClick_, this);
 
     const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;
-  const element = document.createElement('div');
+    const element = this.element;
     element.className = cssClasses;
     element.appendChild(button);
+  }
 
-  Control.call(this, {
-    element: element,
-    target: options.target
-  });
-};
-
-inherits(ZoomToExtent, Control);
-
-
-/**
- * @param {Event} event The event to handle
+  /**
+   * @param {MouseEvent} event The event to handle
    * @private
    */
-ZoomToExtent.prototype.handleClick_ = function(event) {
+  handleClick_(event) {
     event.preventDefault();
     this.handleZoomToExtent();
-};
+  }
 
-
-/**
+  /**
    * @protected
    */
-ZoomToExtent.prototype.handleZoomToExtent = function() {
+  handleZoomToExtent() {
     const map = this.getMap();
     const view = map.getView();
     const extent = !this.extent ? view.getProjection().getExtent() : this.extent;
     view.fit(extent);
-};
+  }
+}
+
 export default ZoomToExtent;

src/ol/dom.js

@@ -25,7 +25,7 @@ export function createCanvasContext2D(opt_width, opt_height) {
  * Get the current computed width for the given element including margin,
  * padding and border.
  * Equivalent to jQuery's `$(el).outerWidth(true)`.
- * @param {!Element} element Element.
+ * @param {!HTMLElement} element Element.
  * @return {number} The width.
  */
 export function outerWidth(element) {
@@ -41,7 +41,7 @@ export function outerWidth(element) {
  * Get the current computed height for the given element including margin,
  * padding and border.
  * Equivalent to jQuery's `$(el).outerHeight(true)`.
- * @param {!Element} element Element.
+ * @param {!HTMLElement} element Element.
  * @return {number} The height.
  */
 export function outerHeight(element) {

src/ol/events.js

@@ -127,7 +127,7 @@ function removeListeners(target, type) {
 
 /**
  * Registers an event listener on an event target. Inspired by
- * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
+ * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html
  *
  * This function efficiently binds a `listener` to a `this` object, and returns
  * a key for use with {@link module:ol/events~unlistenByKey}.
@@ -170,7 +170,7 @@ export function listen(target, type, listener, opt_this, opt_once) {
 
 /**
  * Registers a one-off event listener on an event target. Inspired by
- * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
+ * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html
  *
  * This function efficiently binds a `listener` as self-unregistering listener
  * to a `this` object, and returns a key for use with
@@ -195,7 +195,7 @@ export function listenOnce(target, type, listener, opt_this) {
 
 /**
  * Unregisters an event listener on an event target. Inspired by
- * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
+ * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html
  *
  * To return a listener, this function needs to be called with the exact same
  * arguments that were used for a previous {@link module:ol/events~listen} call.
@@ -219,7 +219,7 @@ export function unlisten(target, type, listener, opt_this) {
 
 /**
  * Unregisters event listeners on an event target. Inspired by
- * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
+ * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html
  *
  * The argument passed to this function is the key returned from
  * {@link module:ol/events~listen} or {@link module:ol/events~listenOnce}.
@@ -246,7 +246,7 @@ export function unlistenByKey(key) {
 
 /**
  * Unregisters all event listeners on an event target. Inspired by
- * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
+ * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html
  *
  * @param {module:ol/events/EventTarget~EventTargetLike} target Target.
  */

src/ol/events/Event.js

@@ -1,20 +1,23 @@
 /**
  * @module ol/events/Event
  */
+
 /**
  * @classdesc
  * Stripped down implementation of the W3C DOM Level 2 Event interface.
- * @see {@link https://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-interface}
+ * See https://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-interface.
  *
  * This implementation only provides `type` and `target` properties, and
  * `stopPropagation` and `preventDefault` methods. It is meant as base class
  * for higher level events defined in the library, and works with
  * {@link module:ol/events/EventTarget~EventTarget}.
- *
- * @constructor
+ */
+class Event {
+
+  /**
    * @param {string} type Type.
    */
-const Event = function(type) {
+  constructor(type) {
 
     /**
      * @type {boolean}
@@ -34,25 +37,27 @@ const Event = function(type) {
      * @api
      */
     this.target = null;
-
-};
-
-
-/**
- * Stop event propagation.
- * @function
- * @api
- */
-Event.prototype.preventDefault =
+  }
 
   /**
    * Stop event propagation.
    * @function
    * @api
    */
-  Event.prototype.stopPropagation = function() {
+  preventDefault() {
     this.propagationStopped = true;
-  };
+  }
+
+  /**
+   * Stop event propagation.
+   * @function
+   * @api
+   */
+  stopPropagation() {
+    this.propagationStopped = true;
+  }
+
+}
 
 
 /**

src/ol/events/EventTarget.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/events/EventTarget
  */
-import {inherits} from '../util.js';
 import Disposable from '../Disposable.js';
 import {unlistenAll} from '../events.js';
 import {UNDEFINED} from '../functions.js';
@@ -16,7 +15,7 @@ import Event from '../events/Event.js';
 /**
  * @classdesc
  * A simplified implementation of the W3C DOM Level 2 EventTarget interface.
- * @see {@link https://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-EventTarget}
+ * See https://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-EventTarget.
  *
  * There are two important simplifications compared to the specification:
  *
@@ -27,13 +26,11 @@ import Event from '../events/Event.js';
  *    `stopPropagation` or `preventDefault` on an event object, it means that no
  *    more listeners after this one will be called. Same as when the listener
  *    returns false.
- *
- * @constructor
- * @extends {module:ol/Disposable}
  */
-const EventTarget = function() {
+class EventTarget extends Disposable {
+  constructor() {
 
-  Disposable.call(this);
+    super();
 
     /**
      * @private
@@ -53,16 +50,13 @@ const EventTarget = function() {
      */
     this.listeners_ = {};
 
-};
+  }
 
-inherits(EventTarget, Disposable);
-
-
-/**
+  /**
    * @param {string} type Type.
    * @param {module:ol/events~ListenerFunction} listener Listener.
    */
-EventTarget.prototype.addEventListener = function(type, listener) {
+  addEventListener(type, listener) {
     let listeners = this.listeners_[type];
     if (!listeners) {
       listeners = this.listeners_[type] = [];
@@ -70,17 +64,22 @@ EventTarget.prototype.addEventListener = function(type, listener) {
     if (listeners.indexOf(listener) === -1) {
       listeners.push(listener);
     }
-};
+  }
 
-
-/**
+  /**
+   * Dispatches an event and calls all listeners listening for events
+   * of this type. The event parameter can either be a string or an
+   * Object with a `type` property.
+   *
    * @param {{type: string,
- *     target: (EventTarget|module:ol/events/EventTarget|undefined)}|module:ol/events/Event|
- *     string} event Event or event type.
+   *     target: (EventTarget|module:ol/events/EventTarget|undefined)}|
+   *     module:ol/events/Event|string} event Event object.
    * @return {boolean|undefined} `false` if anyone called preventDefault on the
    *     event object or if any of the listeners returned false.
+   * @function
+   * @api
    */
-EventTarget.prototype.dispatchEvent = function(event) {
+  dispatchEvent(event) {
     const evt = typeof event === 'string' ? new Event(event) : event;
     const type = evt.type;
     evt.target = this;
@@ -109,46 +108,42 @@ EventTarget.prototype.dispatchEvent = function(event) {
       }
       return propagate;
     }
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-EventTarget.prototype.disposeInternal = function() {
+  disposeInternal() {
     unlistenAll(this);
-};
+  }
 
-
-/**
+  /**
    * Get the listeners for a specified event type. Listeners are returned in the
    * order that they will be called in.
    *
    * @param {string} type Type.
    * @return {Array.<module:ol/events~ListenerFunction>} Listeners.
    */
-EventTarget.prototype.getListeners = function(type) {
+  getListeners(type) {
     return this.listeners_[type];
-};
+  }
 
-
-/**
+  /**
    * @param {string=} opt_type Type. If not provided,
    *     `true` will be returned if this EventTarget has any listeners.
    * @return {boolean} Has listeners.
    */
-EventTarget.prototype.hasListener = function(opt_type) {
+  hasListener(opt_type) {
     return opt_type ?
       opt_type in this.listeners_ :
       Object.keys(this.listeners_).length > 0;
-};
+  }
 
-
-/**
+  /**
    * @param {string} type Type.
    * @param {module:ol/events~ListenerFunction} listener Listener.
    */
-EventTarget.prototype.removeEventListener = function(type, listener) {
+  removeEventListener(type, listener) {
     const listeners = this.listeners_[type];
     if (listeners) {
       const index = listeners.indexOf(listener);
@@ -163,5 +158,8 @@ EventTarget.prototype.removeEventListener = function(type, listener) {
         }
       }
     }
-};
+  }
+}
+
+
 export default EventTarget;

src/ol/events/condition.js

@@ -237,7 +237,7 @@ export const mouseOnly = function(mapBrowserEvent) {
 /**
  * Return `true` if the event originates from a primary pointer in
  * contact with the surface or if the left mouse button is pressed.
- * @see http://www.w3.org/TR/pointerevents/#button-states
+ * See http://www.w3.org/TR/pointerevents/#button-states.
  *
  * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.
  * @return {boolean} True if the event originates from a primary pointer.

src/ol/format/EsriJSON.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/EsriJSON
  */
-import {inherits} from '../util.js';
 import Feature from '../Feature.js';
 import {assert} from '../asserts.js';
 import {containsExtent} from '../extent.js';
@@ -58,16 +57,18 @@ GEOMETRY_WRITERS[GeometryType.MULTI_POLYGON] = writeMultiPolygonGeometry;
  * @classdesc
  * Feature format for reading and writing data in the EsriJSON format.
  *
- * @constructor
- * @extends {module:ol/format/JSONFeature}
- * @param {module:ol/format/EsriJSON~Options=} opt_options Options.
  * @api
  */
-const EsriJSON = function(opt_options) {
+class EsriJSON extends JSONFeature {
+
+  /**
+   * @param {module:ol/format/EsriJSON~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
-  JSONFeature.call(this);
+    super();
 
     /**
      * Name of the geometry attribute for features.
@@ -76,9 +77,134 @@ const EsriJSON = function(opt_options) {
      */
     this.geometryName_ = options.geometryName;
 
-};
+  }
 
-inherits(EsriJSON, JSONFeature);
+  /**
+   * @inheritDoc
+   */
+  readFeatureFromObject(object, opt_options) {
+    const esriJSONFeature = /** @type {EsriJSONFeature} */ (object);
+    const geometry = readGeometry(esriJSONFeature.geometry, opt_options);
+    const feature = new Feature();
+    if (this.geometryName_) {
+      feature.setGeometryName(this.geometryName_);
+    }
+    feature.setGeometry(geometry);
+    if (opt_options && opt_options.idField &&
+      esriJSONFeature.attributes[opt_options.idField]) {
+      feature.setId(/** @type {number} */(esriJSONFeature.attributes[opt_options.idField]));
+    }
+    if (esriJSONFeature.attributes) {
+      feature.setProperties(esriJSONFeature.attributes);
+    }
+    return feature;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeaturesFromObject(object, opt_options) {
+    const esriJSONObject = /** @type {EsriJSONObject} */ (object);
+    const options = opt_options ? opt_options : {};
+    if (esriJSONObject.features) {
+      const esriJSONFeatureCollection = /** @type {EsriJSONFeatureCollection} */ (object);
+      /** @type {Array.<module:ol/Feature>} */
+      const features = [];
+      const esriJSONFeatures = esriJSONFeatureCollection.features;
+      options.idField = object.objectIdFieldName;
+      for (let i = 0, ii = esriJSONFeatures.length; i < ii; ++i) {
+        features.push(this.readFeatureFromObject(esriJSONFeatures[i], options));
+      }
+      return features;
+    } else {
+      return [this.readFeatureFromObject(object, options)];
+    }
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readGeometryFromObject(object, opt_options) {
+    return readGeometry(/** @type {EsriJSONGeometry} */(object), opt_options);
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readProjectionFromObject(object) {
+    const esriJSONObject = /** @type {EsriJSONObject} */ (object);
+    if (esriJSONObject.spatialReference && esriJSONObject.spatialReference.wkid) {
+      const crs = esriJSONObject.spatialReference.wkid;
+      return getProjection('EPSG:' + crs);
+    } else {
+      return null;
+    }
+  }
+
+  /**
+   * Encode a geometry as a EsriJSON object.
+   *
+   * @param {module:ol/geom/Geometry} geometry Geometry.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {EsriJSONGeometry} Object.
+   * @override
+   * @api
+   */
+  writeGeometryObject(geometry, opt_options) {
+    return writeGeometry(geometry, this.adaptOptions(opt_options));
+  }
+
+  /**
+   * Encode a feature as a esriJSON Feature object.
+   *
+   * @param {module:ol/Feature} feature Feature.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {Object} Object.
+   * @override
+   * @api
+   */
+  writeFeatureObject(feature, opt_options) {
+    opt_options = this.adaptOptions(opt_options);
+    const object = {};
+    const geometry = feature.getGeometry();
+    if (geometry) {
+      object['geometry'] = writeGeometry(geometry, opt_options);
+      if (opt_options && opt_options.featureProjection) {
+        object['geometry']['spatialReference'] = /** @type {EsriJSONCRS} */({
+          wkid: getProjection(opt_options.featureProjection).getCode().split(':').pop()
+        });
+      }
+    }
+    const properties = feature.getProperties();
+    delete properties[feature.getGeometryName()];
+    if (!isEmpty(properties)) {
+      object['attributes'] = properties;
+    } else {
+      object['attributes'] = {};
+    }
+    return object;
+  }
+
+  /**
+   * Encode an array of features as a EsriJSON object.
+   *
+   * @param {Array.<module:ol/Feature>} features Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {Object} EsriJSON Object.
+   * @override
+   * @api
+   */
+  writeFeaturesObject(features, opt_options) {
+    opt_options = this.adaptOptions(opt_options);
+    const objects = [];
+    for (let i = 0, ii = features.length; i < ii; ++i) {
+      objects.push(this.writeFeatureObject(features[i], opt_options));
+    }
+    return /** @type {EsriJSONFeatureCollection} */ ({
+      'features': objects
+    });
+  }
+}
 
 
 /**
@@ -413,121 +539,6 @@ function writeMultiPolygonGeometry(geometry, opt_options) {
 }
 
 
-/**
- * Read a feature from a EsriJSON Feature source.  Only works for Feature,
- * use `readFeatures` to read FeatureCollection source.
- *
- * @function
- * @param {ArrayBuffer|Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/Feature} Feature.
- * @api
- */
-EsriJSON.prototype.readFeature;
-
-
-/**
- * Read all features from a EsriJSON source.  Works with both Feature and
- * FeatureCollection sources.
- *
- * @function
- * @param {ArrayBuffer|Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-EsriJSON.prototype.readFeatures;
-
-
-/**
- * @inheritDoc
- */
-EsriJSON.prototype.readFeatureFromObject = function(object, opt_options) {
-  const esriJSONFeature = /** @type {EsriJSONFeature} */ (object);
-  const geometry = readGeometry(esriJSONFeature.geometry, opt_options);
-  const feature = new Feature();
-  if (this.geometryName_) {
-    feature.setGeometryName(this.geometryName_);
-  }
-  feature.setGeometry(geometry);
-  if (opt_options && opt_options.idField &&
-    esriJSONFeature.attributes[opt_options.idField]) {
-    feature.setId(/** @type {number} */(esriJSONFeature.attributes[opt_options.idField]));
-  }
-  if (esriJSONFeature.attributes) {
-    feature.setProperties(esriJSONFeature.attributes);
-  }
-  return feature;
-};
-
-
-/**
- * @inheritDoc
- */
-EsriJSON.prototype.readFeaturesFromObject = function(object, opt_options) {
-  const esriJSONObject = /** @type {EsriJSONObject} */ (object);
-  const options = opt_options ? opt_options : {};
-  if (esriJSONObject.features) {
-    const esriJSONFeatureCollection = /** @type {EsriJSONFeatureCollection} */ (object);
-    /** @type {Array.<module:ol/Feature>} */
-    const features = [];
-    const esriJSONFeatures = esriJSONFeatureCollection.features;
-    options.idField = object.objectIdFieldName;
-    for (let i = 0, ii = esriJSONFeatures.length; i < ii; ++i) {
-      features.push(this.readFeatureFromObject(esriJSONFeatures[i], options));
-    }
-    return features;
-  } else {
-    return [this.readFeatureFromObject(object, options)];
-  }
-};
-
-
-/**
- * Read a geometry from a EsriJSON source.
- *
- * @function
- * @param {ArrayBuffer|Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/geom/Geometry} Geometry.
- * @api
- */
-EsriJSON.prototype.readGeometry;
-
-
-/**
- * @inheritDoc
- */
-EsriJSON.prototype.readGeometryFromObject = function(object, opt_options) {
-  return readGeometry(/** @type {EsriJSONGeometry} */(object), opt_options);
-};
-
-
-/**
- * Read the projection from a EsriJSON source.
- *
- * @function
- * @param {ArrayBuffer|Document|Node|Object|string} source Source.
- * @return {module:ol/proj/Projection} Projection.
- * @api
- */
-EsriJSON.prototype.readProjection;
-
-
-/**
- * @inheritDoc
- */
-EsriJSON.prototype.readProjectionFromObject = function(object) {
-  const esriJSONObject = /** @type {EsriJSONObject} */ (object);
-  if (esriJSONObject.spatialReference && esriJSONObject.spatialReference.wkid) {
-    const crs = esriJSONObject.spatialReference.wkid;
-    return getProjection('EPSG:' + crs);
-  } else {
-    return null;
-  }
-};
-
-
 /**
  * @param {module:ol/geom/Geometry} geometry Geometry.
  * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
@@ -540,106 +551,4 @@ function writeGeometry(geometry, opt_options) {
 }
 
 
-/**
- * Encode a geometry as a EsriJSON string.
- *
- * @function
- * @param {module:ol/geom/Geometry} geometry Geometry.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} EsriJSON.
- * @api
- */
-EsriJSON.prototype.writeGeometry;
-
-
-/**
- * Encode a geometry as a EsriJSON object.
- *
- * @param {module:ol/geom/Geometry} geometry Geometry.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {EsriJSONGeometry} Object.
- * @override
- * @api
- */
-EsriJSON.prototype.writeGeometryObject = function(geometry, opt_options) {
-  return writeGeometry(geometry, this.adaptOptions(opt_options));
-};
-
-
-/**
- * Encode a feature as a EsriJSON Feature string.
- *
- * @function
- * @param {module:ol/Feature} feature Feature.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} EsriJSON.
- * @api
- */
-EsriJSON.prototype.writeFeature;
-
-
-/**
- * Encode a feature as a esriJSON Feature object.
- *
- * @param {module:ol/Feature} feature Feature.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {Object} Object.
- * @override
- * @api
- */
-EsriJSON.prototype.writeFeatureObject = function(feature, opt_options) {
-  opt_options = this.adaptOptions(opt_options);
-  const object = {};
-  const geometry = feature.getGeometry();
-  if (geometry) {
-    object['geometry'] = writeGeometry(geometry, opt_options);
-    if (opt_options && opt_options.featureProjection) {
-      object['geometry']['spatialReference'] = /** @type {EsriJSONCRS} */({
-        wkid: getProjection(opt_options.featureProjection).getCode().split(':').pop()
-      });
-    }
-  }
-  const properties = feature.getProperties();
-  delete properties[feature.getGeometryName()];
-  if (!isEmpty(properties)) {
-    object['attributes'] = properties;
-  } else {
-    object['attributes'] = {};
-  }
-  return object;
-};
-
-
-/**
- * Encode an array of features as EsriJSON.
- *
- * @function
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} EsriJSON.
- * @api
- */
-EsriJSON.prototype.writeFeatures;
-
-
-/**
- * Encode an array of features as a EsriJSON object.
- *
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {Object} EsriJSON Object.
- * @override
- * @api
- */
-EsriJSON.prototype.writeFeaturesObject = function(features, opt_options) {
-  opt_options = this.adaptOptions(opt_options);
-  const objects = [];
-  for (let i = 0, ii = features.length; i < ii; ++i) {
-    objects.push(this.writeFeatureObject(features[i], opt_options));
-  }
-  return /** @type {EsriJSONFeatureCollection} */ ({
-    'features': objects
-  });
-};
-
 export default EsriJSON;

src/ol/format/Feature.js

@@ -56,11 +56,11 @@ import {get as getProjection, equivalent as equivalentProjection, transformExten
  * {@link module:ol/Feature~Feature} objects from a variety of commonly used geospatial
  * file formats.  See the documentation for each format for more details.
  *
- * @constructor
  * @abstract
  * @api
  */
-const FeatureFormat = function() {
+class FeatureFormat {
+  constructor() {
 
     /**
      * @protected
@@ -74,17 +74,16 @@ const FeatureFormat = function() {
      */
     this.defaultFeatureProjection = null;
 
-};
+  }
 
-
-/**
+  /**
    * Adds the data projection to the read options.
    * @param {Document|Node|Object|string} source Source.
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
    * @return {module:ol/format/Feature~ReadOptions|undefined} Options.
    * @protected
    */
-FeatureFormat.prototype.getReadOptions = function(source, opt_options) {
+  getReadOptions(source, opt_options) {
     let options;
     if (opt_options) {
       options = {
@@ -94,10 +93,9 @@ FeatureFormat.prototype.getReadOptions = function(source, opt_options) {
       };
     }
     return this.adaptOptions(options);
-};
+  }
 
-
-/**
+  /**
    * Sets the `dataProjection` on the options, if no `dataProjection`
    * is set.
    * @param {module:ol/format/Feature~WriteOptions|module:ol/format/Feature~ReadOptions|undefined} options
@@ -106,31 +104,28 @@ FeatureFormat.prototype.getReadOptions = function(source, opt_options) {
    * @return {module:ol/format/Feature~WriteOptions|module:ol/format/Feature~ReadOptions|undefined}
    *     Updated options.
    */
-FeatureFormat.prototype.adaptOptions = function(options) {
+  adaptOptions(options) {
     return assign({
       dataProjection: this.dataProjection,
       featureProjection: this.defaultFeatureProjection
     }, options);
-};
+  }
 
-
-/**
+  /**
    * Get the extent from the source of the last {@link readFeatures} call.
    * @return {module:ol/extent~Extent} Tile extent.
    */
-FeatureFormat.prototype.getLastExtent = function() {
+  getLastExtent() {
     return null;
-};
+  }
 
-
-/**
+  /**
    * @abstract
    * @return {module:ol/format/FormatType} Format.
    */
-FeatureFormat.prototype.getType = function() {};
+  getType() {}
 
-
-/**
+  /**
    * Read a single feature from a source.
    *
    * @abstract
@@ -138,10 +133,9 @@ FeatureFormat.prototype.getType = function() {};
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
    * @return {module:ol/Feature} Feature.
    */
-FeatureFormat.prototype.readFeature = function(source, opt_options) {};
+  readFeature(source, opt_options) {}
 
-
-/**
+  /**
    * Read all features from a source.
    *
    * @abstract
@@ -149,10 +143,9 @@ FeatureFormat.prototype.readFeature = function(source, opt_options) {};
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
    * @return {Array.<module:ol/Feature>} Features.
    */
-FeatureFormat.prototype.readFeatures = function(source, opt_options) {};
+  readFeatures(source, opt_options) {}
 
-
-/**
+  /**
    * Read a single geometry from a source.
    *
    * @abstract
@@ -160,20 +153,18 @@ FeatureFormat.prototype.readFeatures = function(source, opt_options) {};
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
    * @return {module:ol/geom/Geometry} Geometry.
    */
-FeatureFormat.prototype.readGeometry = function(source, opt_options) {};
+  readGeometry(source, opt_options) {}
 
-
-/**
+  /**
    * Read the projection from a source.
    *
    * @abstract
    * @param {Document|Node|Object|string} source Source.
    * @return {module:ol/proj/Projection} Projection.
    */
-FeatureFormat.prototype.readProjection = function(source) {};
+  readProjection(source) {}
 
-
-/**
+  /**
    * Encode a feature in this format.
    *
    * @abstract
@@ -181,10 +172,9 @@ FeatureFormat.prototype.readProjection = function(source) {};
    * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
    * @return {string} Result.
    */
-FeatureFormat.prototype.writeFeature = function(feature, opt_options) {};
+  writeFeature(feature, opt_options) {}
 
-
-/**
+  /**
    * Encode an array of features in this format.
    *
    * @abstract
@@ -192,10 +182,9 @@ FeatureFormat.prototype.writeFeature = function(feature, opt_options) {};
    * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
    * @return {string} Result.
    */
-FeatureFormat.prototype.writeFeatures = function(features, opt_options) {};
+  writeFeatures(features, opt_options) {}
 
-
-/**
+  /**
    * Write a single geometry in this format.
    *
    * @abstract
@@ -203,7 +192,8 @@ FeatureFormat.prototype.writeFeatures = function(features, opt_options) {};
    * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
    * @return {string} Result.
    */
-FeatureFormat.prototype.writeGeometry = function(geometry, opt_options) {};
+  writeGeometry(geometry, opt_options) {}
+}
 
 export default FeatureFormat;
 

src/ol/format/GML.js

@@ -9,10 +9,8 @@ import GML3 from '../format/GML3.js';
  * version 3.1.1.
  * Currently only supports GML 3.1.1 Simple Features profile.
  *
- * @constructor
  * @param {module:ol/format/GMLBase~Options=} opt_options
  *     Optional configuration object.
- * @extends {module:ol/format/GMLBase}
  * @api
  */
 const GML = GML3;

src/ol/format/GML2.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/GML2
  */
-import {inherits} from '../util.js';
 import {createOrUpdate} from '../extent.js';
 import {transformWithOptions} from '../format/Feature.js';
 import GMLBase, {GMLNS} from '../format/GMLBase.js';
@@ -20,25 +19,39 @@ import {createElementNS, getAllTextContent, makeArrayPusher, makeChildAppender,
 const schemaLocation = GMLNS + ' http://schemas.opengis.net/gml/2.1.2/feature.xsd';
 
 
+/**
+ * @const
+ * @type {Object.<string, string>}
+ */
+const MULTIGEOMETRY_TO_MEMBER_NODENAME = {
+  'MultiLineString': 'lineStringMember',
+  'MultiCurve': 'curveMember',
+  'MultiPolygon': 'polygonMember',
+  'MultiSurface': 'surfaceMember'
+};
+
+
 /**
  * @classdesc
  * Feature format for reading and writing data in the GML format,
  * version 2.1.2.
  *
- * @constructor
- * @param {module:ol/format/GMLBase~Options=} opt_options Optional configuration object.
- * @extends {module:ol/format/GMLBase}
  * @api
  */
-const GML2 = function(opt_options) {
+class GML2 extends GMLBase {
+
+  /**
+   * @param {module:ol/format/GMLBase~Options=} opt_options Optional configuration object.
+   */
+  constructor(opt_options) {
     const options = /** @type {module:ol/format/GMLBase~Options} */
         (opt_options ? opt_options : {});
 
-  GMLBase.call(this, options);
+    super(options);
 
     this.FEATURE_COLLECTION_PARSERS[GMLNS][
       'featureMember'] =
-      makeArrayPusher(GMLBase.prototype.readFeaturesInternal);
+        makeArrayPusher(this.readFeaturesInternal);
 
     /**
      * @inheritDoc
@@ -46,18 +59,15 @@ const GML2 = function(opt_options) {
     this.schemaLocation = options.schemaLocation ?
       options.schemaLocation : schemaLocation;
 
-};
+  }
 
-inherits(GML2, GMLBase);
-
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    * @return {Array.<number>|undefined} Flat coordinates.
    */
-GML2.prototype.readFlatCoordinates_ = function(node, objectStack) {
+  readFlatCoordinates_(node, objectStack) {
     const s = getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
     const context = /** @type {module:ol/xml~NodeStackItem} */ (objectStack[0]);
     const containerSrs = context['srsName'];
@@ -82,31 +92,29 @@ GML2.prototype.readFlatCoordinates_ = function(node, objectStack) {
       }
     }
     return flatCoordinates;
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    * @return {module:ol/extent~Extent|undefined} Envelope.
    */
-GML2.prototype.readBox_ = function(node, objectStack) {
+  readBox_(node, objectStack) {
     /** @type {Array.<number>} */
     const flatCoordinates = pushParseAndPop([null],
       this.BOX_PARSERS_, node, objectStack, this);
     return createOrUpdate(flatCoordinates[1][0],
       flatCoordinates[1][1], flatCoordinates[1][3],
       flatCoordinates[1][4]);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    */
-GML2.prototype.innerBoundaryIsParser_ = function(node, objectStack) {
+  innerBoundaryIsParser_(node, objectStack) {
     /** @type {Array.<number>|undefined} */
     const flatLinearRing = pushParseAndPop(undefined,
       this.RING_PARSERS, node, objectStack, this);
@@ -115,15 +123,14 @@ GML2.prototype.innerBoundaryIsParser_ = function(node, objectStack) {
           (objectStack[objectStack.length - 1]);
       flatLinearRings.push(flatLinearRing);
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    */
-GML2.prototype.outerBoundaryIsParser_ = function(node, objectStack) {
+  outerBoundaryIsParser_(node, objectStack) {
     /** @type {Array.<number>|undefined} */
     const flatLinearRing = pushParseAndPop(undefined,
       this.RING_PARSERS, node, objectStack, this);
@@ -132,10 +139,9 @@ GML2.prototype.outerBoundaryIsParser_ = function(node, objectStack) {
           (objectStack[objectStack.length - 1]);
       flatLinearRings[0] = flatLinearRing;
     }
-};
+  }
 
-
-/**
+  /**
    * @const
    * @param {*} value Value.
    * @param {Array.<*>} objectStack Object stack.
@@ -143,7 +149,7 @@ GML2.prototype.outerBoundaryIsParser_ = function(node, objectStack) {
    * @return {Node|undefined} Node.
    * @private
    */
-GML2.prototype.GEOMETRY_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
+  GEOMETRY_NODE_FACTORY_(value, objectStack, opt_nodeName) {
     const context = objectStack[objectStack.length - 1];
     const multiSurface = context['multiSurface'];
     const surface = context['surface'];
@@ -163,15 +169,14 @@ GML2.prototype.GEOMETRY_NODE_FACTORY_ = function(value, objectStack, opt_nodeNam
     }
     return createElementNS('http://www.opengis.net/gml',
       nodeName);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/Feature} feature Feature.
    * @param {Array.<*>} objectStack Node stack.
    */
-GML2.prototype.writeFeatureElement = function(node, feature, objectStack) {
+  writeFeatureElement(node, feature, objectStack) {
     const fid = feature.getId();
     if (fid) {
       node.setAttribute('fid', fid);
@@ -210,16 +215,15 @@ GML2.prototype.writeFeatureElement = function(node, feature, objectStack) {
       makeSimpleNodeFactory(undefined, featureNS),
       values,
       objectStack, keys);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/LineString} geometry LineString geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeCurveOrLineString_ = function(node, geometry, objectStack) {
+  writeCurveOrLineString_(node, geometry, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const srsName = context['srsName'];
     if (node.nodeName !== 'LineStringSegment' && srsName) {
@@ -236,31 +240,29 @@ GML2.prototype.writeCurveOrLineString_ = function(node, geometry, objectStack) {
       this.writeCurveSegments_(segments,
         geometry, objectStack);
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/LineString} line LineString geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeLineStringOrCurveMember_ = function(node, line, objectStack) {
+  writeLineStringOrCurveMember_(node, line, objectStack) {
     const child = this.GEOMETRY_NODE_FACTORY_(line, objectStack);
     if (child) {
       node.appendChild(child);
       this.writeCurveOrLineString_(child, line, objectStack);
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/MultiLineString} geometry MultiLineString geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeMultiCurveOrLineString_ = function(node, geometry, objectStack) {
+  writeMultiCurveOrLineString_(node, geometry, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const hasZ = context['hasZ'];
     const srsName = context['srsName'];
@@ -273,15 +275,14 @@ GML2.prototype.writeMultiCurveOrLineString_ = function(node, geometry, objectSta
       this.LINESTRINGORCURVEMEMBER_SERIALIZERS_,
       this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_, lines,
       objectStack, undefined, this);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/Geometry|module:ol/extent~Extent} geometry Geometry.
    * @param {Array.<*>} objectStack Node stack.
    */
-GML2.prototype.writeGeometryElement = function(node, geometry, objectStack) {
+  writeGeometryElement(node, geometry, objectStack) {
     const context = /** @type {module:ol/format/Feature~WriteOptions} */ (objectStack[objectStack.length - 1]);
     const item = assign({}, context);
     item.node = node;
@@ -300,31 +301,29 @@ GML2.prototype.writeGeometryElement = function(node, geometry, objectStack) {
       (item), this.GEOMETRY_SERIALIZERS_,
       this.GEOMETRY_NODE_FACTORY_, [value],
       objectStack, undefined, this);
-};
+  }
 
-
-/**
+  /**
    * @param {string} namespaceURI XML namespace.
    * @returns {Node} coordinates node.
    * @private
    */
-GML2.prototype.createCoordinatesNode_ = function(namespaceURI) {
+  createCoordinatesNode_(namespaceURI) {
     const coordinates = createElementNS(namespaceURI, 'coordinates');
     coordinates.setAttribute('decimal', '.');
     coordinates.setAttribute('cs', ',');
     coordinates.setAttribute('ts', ' ');
 
     return coordinates;
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/LineString|module:ol/geom/LinearRing} value Geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeCoordinates_ = function(node, value, objectStack) {
+  writeCoordinates_(node, value, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const hasZ = context['hasZ'];
     const srsName = context['srsName'];
@@ -337,29 +336,27 @@ GML2.prototype.writeCoordinates_ = function(node, value, objectStack) {
       parts[i] = this.getCoords_(point, srsName, hasZ);
     }
     writeStringTextNode(node, parts.join(' '));
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/LineString} line LineString geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeCurveSegments_ = function(node, line, objectStack) {
+  writeCurveSegments_(node, line, objectStack) {
     const child = createElementNS(node.namespaceURI, 'LineStringSegment');
     node.appendChild(child);
     this.writeCurveOrLineString_(child, line, objectStack);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/Polygon} geometry Polygon geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeSurfaceOrPolygon_ = function(node, geometry, objectStack) {
+  writeSurfaceOrPolygon_(node, geometry, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const hasZ = context['hasZ'];
     const srsName = context['srsName'];
@@ -379,17 +376,16 @@ GML2.prototype.writeSurfaceOrPolygon_ = function(node, geometry, objectStack) {
       this.writeSurfacePatches_(
         patches, geometry, objectStack);
     }
-};
+  }
 
-
-/**
+  /**
    * @param {*} value Value.
    * @param {Array.<*>} objectStack Object stack.
    * @param {string=} opt_nodeName Node name.
    * @return {Node} Node.
    * @private
    */
-GML2.prototype.RING_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
+  RING_NODE_FACTORY_(value, objectStack, opt_nodeName) {
     const context = objectStack[objectStack.length - 1];
     const parentNode = context.node;
     const exteriorWritten = context['exteriorWritten'];
@@ -398,43 +394,40 @@ GML2.prototype.RING_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
     }
     return createElementNS(parentNode.namespaceURI,
       exteriorWritten !== undefined ? 'innerBoundaryIs' : 'outerBoundaryIs');
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/Polygon} polygon Polygon geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeSurfacePatches_ = function(node, polygon, objectStack) {
+  writeSurfacePatches_(node, polygon, objectStack) {
     const child = createElementNS(node.namespaceURI, 'PolygonPatch');
     node.appendChild(child);
     this.writeSurfaceOrPolygon_(child, polygon, objectStack);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/LinearRing} ring LinearRing geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeRing_ = function(node, ring, objectStack) {
+  writeRing_(node, ring, objectStack) {
     const linearRing = createElementNS(node.namespaceURI, 'LinearRing');
     node.appendChild(linearRing);
     this.writeLinearRing_(linearRing, ring, objectStack);
-};
+  }
 
-
-/**
+  /**
    * @param {Array.<number>} point Point geometry.
    * @param {string=} opt_srsName Optional srsName
    * @param {boolean=} opt_hasZ whether the geometry has a Z coordinate (is 3D) or not.
    * @return {string} The coords string.
    * @private
    */
-GML2.prototype.getCoords_ = function(point, opt_srsName, opt_hasZ) {
+  getCoords_(point, opt_srsName, opt_hasZ) {
     let axisOrientation = 'enu';
     if (opt_srsName) {
       axisOrientation = getProjection(opt_srsName).getAxisOrientation();
@@ -449,16 +442,15 @@ GML2.prototype.getCoords_ = function(point, opt_srsName, opt_hasZ) {
     }
 
     return coords;
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/Point} geometry Point geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writePoint_ = function(node, geometry, objectStack) {
+  writePoint_(node, geometry, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const hasZ = context['hasZ'];
     const srsName = context['srsName'];
@@ -470,16 +462,15 @@ GML2.prototype.writePoint_ = function(node, geometry, objectStack) {
     const point = geometry.getCoordinates();
     const coord = this.getCoords_(point, srsName, hasZ);
     writeStringTextNode(coordinates, coord);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/MultiPoint} geometry MultiPoint geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeMultiPoint_ = function(node, geometry, objectStack) {
+  writeMultiPoint_(node, geometry, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const hasZ = context['hasZ'];
     const srsName = context['srsName'];
@@ -491,29 +482,27 @@ GML2.prototype.writeMultiPoint_ = function(node, geometry, objectStack) {
       this.POINTMEMBER_SERIALIZERS_,
       makeSimpleNodeFactory('pointMember'), points,
       objectStack, undefined, this);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/Point} point Point geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writePointMember_ = function(node, point, objectStack) {
+  writePointMember_(node, point, objectStack) {
     const child = createElementNS(node.namespaceURI, 'Point');
     node.appendChild(child);
     this.writePoint_(child, point, objectStack);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/LinearRing} geometry LinearRing geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeLinearRing_ = function(node, geometry, objectStack) {
+  writeLinearRing_(node, geometry, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const srsName = context['srsName'];
     if (srsName) {
@@ -522,16 +511,15 @@ GML2.prototype.writeLinearRing_ = function(node, geometry, objectStack) {
     const coordinates = this.createCoordinatesNode_(node.namespaceURI);
     node.appendChild(coordinates);
     this.writeCoordinates_(coordinates, geometry, objectStack);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/MultiPolygon} geometry MultiPolygon geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeMultiSurfaceOrPolygon_ = function(node, geometry, objectStack) {
+  writeMultiSurfaceOrPolygon_(node, geometry, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const hasZ = context['hasZ'];
     const srsName = context['srsName'];
@@ -544,32 +532,30 @@ GML2.prototype.writeMultiSurfaceOrPolygon_ = function(node, geometry, objectStac
       this.SURFACEORPOLYGONMEMBER_SERIALIZERS_,
       this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_, polygons,
       objectStack, undefined, this);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/geom/Polygon} polygon Polygon geometry.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeSurfaceOrPolygonMember_ = function(node, polygon, objectStack) {
+  writeSurfaceOrPolygonMember_(node, polygon, objectStack) {
     const child = this.GEOMETRY_NODE_FACTORY_(
       polygon, objectStack);
     if (child) {
       node.appendChild(child);
       this.writeSurfaceOrPolygon_(child, polygon, objectStack);
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/extent~Extent} extent Extent.
    * @param {Array.<*>} objectStack Node stack.
    * @private
    */
-GML2.prototype.writeEnvelope = function(node, extent, objectStack) {
+  writeEnvelope(node, extent, objectStack) {
     const context = objectStack[objectStack.length - 1];
     const srsName = context['srsName'];
     if (srsName) {
@@ -582,22 +568,9 @@ GML2.prototype.writeEnvelope = function(node, extent, objectStack) {
       OBJECT_PROPERTY_NODE_FACTORY,
       values,
       objectStack, keys, this);
-};
+  }
 
-
-/**
- * @const
- * @type {Object.<string, string>}
- */
-const MULTIGEOMETRY_TO_MEMBER_NODENAME = {
-  'MultiLineString': 'lineStringMember',
-  'MultiCurve': 'curveMember',
-  'MultiPolygon': 'polygonMember',
-  'MultiSurface': 'surfaceMember'
-};
-
-
-/**
+  /**
    * @const
    * @param {*} value Value.
    * @param {Array.<*>} objectStack Object stack.
@@ -605,12 +578,12 @@ const MULTIGEOMETRY_TO_MEMBER_NODENAME = {
    * @return {Node|undefined} Node.
    * @private
    */
-GML2.prototype.MULTIGEOMETRY_MEMBER_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
+  MULTIGEOMETRY_MEMBER_NODE_FACTORY_(value, objectStack, opt_nodeName) {
     const parentNode = objectStack[objectStack.length - 1].node;
     return createElementNS('http://www.opengis.net/gml',
       MULTIGEOMETRY_TO_MEMBER_NODENAME[parentNode.nodeName]);
-};
-
+  }
+}
 
 /**
  * @const
@@ -623,7 +596,6 @@ GML2.prototype.GEOMETRY_FLAT_COORDINATES_PARSERS_ = {
   }
 };
 
-
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
@@ -636,7 +608,6 @@ GML2.prototype.FLAT_LINEAR_RINGS_PARSERS_ = {
   }
 };
 
-
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
@@ -649,7 +620,6 @@ GML2.prototype.BOX_PARSERS_ = {
   }
 };
 
-
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
@@ -673,7 +643,6 @@ GML2.prototype.GEOMETRY_PARSERS_ = {
   }
 };
 
-
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
@@ -707,7 +676,6 @@ GML2.prototype.GEOMETRY_SERIALIZERS_ = {
   }
 };
 
-
 /**
  * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
  * @private
@@ -721,7 +689,6 @@ GML2.prototype.LINESTRINGORCURVEMEMBER_SERIALIZERS_ = {
   }
 };
 
-
 /**
  * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
  * @private
@@ -733,7 +700,6 @@ GML2.prototype.RING_SERIALIZERS_ = {
   }
 };
 
-
 /**
  * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
  * @private
@@ -745,7 +711,6 @@ GML2.prototype.POINTMEMBER_SERIALIZERS_ = {
   }
 };
 
-
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
@@ -760,7 +725,6 @@ GML2.prototype.SURFACEORPOLYGONMEMBER_SERIALIZERS_ = {
   }
 };
 
-
 /**
  * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
  * @private

src/ol/format/GMLBase.js

@@ -4,7 +4,6 @@
 // FIXME Envelopes should not be treated as geometries! readEnvelope_ is part
 // of GEOMETRY_PARSERS_ and methods using GEOMETRY_PARSERS_ do not expect
 // envelopes/extents, only geometries!
-import {inherits} from '../util.js';
 import {extend} from '../array.js';
 import Feature from '../Feature.js';
 import {transformWithOptions} from '../format/Feature.js';
@@ -29,6 +28,20 @@ import {getAllTextContent, getAttributeNS, makeArrayPusher, makeReplacer, parseN
 export const GMLNS = 'http://www.opengis.net/gml';
 
 
+/**
+ * A regular expression that matches if a string only contains whitespace
+ * characters. It will e.g. match `''`, `' '`, `'\n'` etc. The non-breaking
+ * space (0xa0) is explicitly included as IE doesn't include it in its
+ * definition of `\s`.
+ *
+ * Information from `goog.string.isEmptyOrWhitespace`: https://github.com/google/closure-library/blob/e877b1e/closure/goog/string/string.js#L156-L160
+ *
+ * @const
+ * @type {RegExp}
+ */
+const ONLY_WHITESPACE_RE = /^[\s\xa0]*$/;
+
+
 /**
  * @typedef {Object} Options
  * @property {Object.<string, string>|string} [featureNS] Feature
@@ -69,13 +82,16 @@ export const GMLNS = 'http://www.opengis.net/gml';
  * This class cannot be instantiated, it contains only base content that
  * is shared with versioned format classes GML2 and GML3.
  *
- * @constructor
  * @abstract
- * @param {module:ol/format/GMLBase~Options=} opt_options
- *     Optional configuration object.
- * @extends {module:ol/format/XMLFeature}
  */
-const GMLBase = function(opt_options) {
+class GMLBase extends XMLFeature {
+
+  /**
+   * @param {module:ol/format/GMLBase~Options=} opt_options Optional configuration object.
+   */
+  constructor(opt_options) {
+    super();
+
     const options = /** @type {module:ol/format/GMLBase~Options} */ (opt_options ? opt_options : {});
 
     /**
@@ -107,36 +123,18 @@ const GMLBase = function(opt_options) {
      */
     this.FEATURE_COLLECTION_PARSERS = {};
     this.FEATURE_COLLECTION_PARSERS[GMLNS] = {
-    'featureMember': makeReplacer(GMLBase.prototype.readFeaturesInternal),
-    'featureMembers': makeReplacer(GMLBase.prototype.readFeaturesInternal)
+      'featureMember': makeReplacer(this.readFeaturesInternal),
+      'featureMembers': makeReplacer(this.readFeaturesInternal)
     };
 
-  XMLFeature.call(this);
-};
+  }
 
-inherits(GMLBase, XMLFeature);
-
-
-/**
- * A regular expression that matches if a string only contains whitespace
- * characters. It will e.g. match `''`, `' '`, `'\n'` etc. The non-breaking
- * space (0xa0) is explicitly included as IE doesn't include it in its
- * definition of `\s`.
- *
- * Information from `goog.string.isEmptyOrWhitespace`: https://github.com/google/closure-library/blob/e877b1e/closure/goog/string/string.js#L156-L160
- *
- * @const
- * @type {RegExp}
- */
-const ONLY_WHITESPACE_RE = /^[\s\xa0]*$/;
-
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {Array.<module:ol/Feature> | undefined} Features.
    */
-GMLBase.prototype.readFeaturesInternal = function(node, objectStack) {
+  readFeaturesInternal(node, objectStack) {
     const localName = node.localName;
     let features = null;
     if (localName == 'FeatureCollection') {
@@ -217,15 +215,14 @@ GMLBase.prototype.readFeaturesInternal = function(node, objectStack) {
       features = [];
     }
     return features;
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/geom/Geometry|undefined} Geometry.
    */
-GMLBase.prototype.readGeometryElement = function(node, objectStack) {
+  readGeometryElement(node, objectStack) {
     const context = /** @type {Object} */ (objectStack[0]);
     context['srsName'] = node.firstElementChild.getAttribute('srsName');
     context['srsDimension'] = node.firstElementChild.getAttribute('srsDimension');
@@ -238,15 +235,14 @@ GMLBase.prototype.readGeometryElement = function(node, objectStack) {
     } else {
       return undefined;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/Feature} Feature.
    */
-GMLBase.prototype.readFeatureElement = function(node, objectStack) {
+  readFeatureElement(node, objectStack) {
     let n;
     const fid = node.getAttribute('fid') || getAttributeNS(node, GMLNS, 'id');
     const values = {};
@@ -280,30 +276,26 @@ GMLBase.prototype.readFeatureElement = function(node, objectStack) {
       feature.setId(fid);
     }
     return feature;
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/geom/Point|undefined} Point.
    */
-GMLBase.prototype.readPoint = function(node, objectStack) {
+  readPoint(node, objectStack) {
     const flatCoordinates = this.readFlatCoordinatesFromNode_(node, objectStack);
     if (flatCoordinates) {
-    const point = new Point(null);
-    point.setFlatCoordinates(GeometryLayout.XYZ, flatCoordinates);
-    return point;
+      return new Point(flatCoordinates, GeometryLayout.XYZ);
+    }
   }
-};
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/geom/MultiPoint|undefined} MultiPoint.
    */
-GMLBase.prototype.readMultiPoint = function(node, objectStack) {
+  readMultiPoint(node, objectStack) {
     /** @type {Array.<Array.<number>>} */
     const coordinates = pushParseAndPop([],
       this.MULTIPOINT_PARSERS_, node, objectStack, this);
@@ -312,100 +304,84 @@ GMLBase.prototype.readMultiPoint = function(node, objectStack) {
     } else {
       return undefined;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/geom/MultiLineString|undefined} MultiLineString.
    */
-GMLBase.prototype.readMultiLineString = function(node, objectStack) {
+  readMultiLineString(node, objectStack) {
     /** @type {Array.<module:ol/geom/LineString>} */
     const lineStrings = pushParseAndPop([],
       this.MULTILINESTRING_PARSERS_, node, objectStack, this);
     if (lineStrings) {
-    const multiLineString = new MultiLineString(null);
-    multiLineString.setLineStrings(lineStrings);
-    return multiLineString;
-  } else {
-    return undefined;
+      return new MultiLineString(lineStrings);
+    }
   }
-};
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/geom/MultiPolygon|undefined} MultiPolygon.
    */
-GMLBase.prototype.readMultiPolygon = function(node, objectStack) {
+  readMultiPolygon(node, objectStack) {
     /** @type {Array.<module:ol/geom/Polygon>} */
     const polygons = pushParseAndPop([], this.MULTIPOLYGON_PARSERS_, node, objectStack, this);
     if (polygons) {
-    const multiPolygon = new MultiPolygon(null);
-    multiPolygon.setPolygons(polygons);
-    return multiPolygon;
-  } else {
-    return undefined;
+      return new MultiPolygon(polygons);
+    }
   }
-};
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    */
-GMLBase.prototype.pointMemberParser_ = function(node, objectStack) {
+  pointMemberParser_(node, objectStack) {
     parseNode(this.POINTMEMBER_PARSERS_, node, objectStack, this);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    */
-GMLBase.prototype.lineStringMemberParser_ = function(node, objectStack) {
+  lineStringMemberParser_(node, objectStack) {
     parseNode(this.LINESTRINGMEMBER_PARSERS_, node, objectStack, this);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    */
-GMLBase.prototype.polygonMemberParser_ = function(node, objectStack) {
+  polygonMemberParser_(node, objectStack) {
     parseNode(this.POLYGONMEMBER_PARSERS_, node, objectStack, this);
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/geom/LineString|undefined} LineString.
    */
-GMLBase.prototype.readLineString = function(node, objectStack) {
+  readLineString(node, objectStack) {
     const flatCoordinates = this.readFlatCoordinatesFromNode_(node, objectStack);
     if (flatCoordinates) {
-    const lineString = new LineString(null);
-    lineString.setFlatCoordinates(GeometryLayout.XYZ, flatCoordinates);
+      const lineString = new LineString(flatCoordinates, GeometryLayout.XYZ);
       return lineString;
     } else {
       return undefined;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    * @return {Array.<number>|undefined} LinearRing flat coordinates.
    */
-GMLBase.prototype.readFlatLinearRing_ = function(node, objectStack) {
+  readFlatLinearRing_(node, objectStack) {
     const ring = pushParseAndPop(null,
       this.GEOMETRY_FLAT_COORDINATES_PARSERS_, node,
       objectStack, this);
@@ -414,37 +390,30 @@ GMLBase.prototype.readFlatLinearRing_ = function(node, objectStack) {
     } else {
       return undefined;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/geom/LinearRing|undefined} LinearRing.
    */
-GMLBase.prototype.readLinearRing = function(node, objectStack) {
+  readLinearRing(node, objectStack) {
     const flatCoordinates = this.readFlatCoordinatesFromNode_(node, objectStack);
     if (flatCoordinates) {
-    const ring = new LinearRing(null);
-    ring.setFlatCoordinates(GeometryLayout.XYZ, flatCoordinates);
-    return ring;
-  } else {
-    return undefined;
+      return new LinearRing(flatCoordinates, GeometryLayout.XYZ);
+    }
   }
-};
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {module:ol/geom/Polygon|undefined} Polygon.
    */
-GMLBase.prototype.readPolygon = function(node, objectStack) {
+  readPolygon(node, objectStack) {
     /** @type {Array.<Array.<number>>} */
     const flatLinearRings = pushParseAndPop([null],
       this.FLAT_LINEAR_RINGS_PARSERS_, node, objectStack, this);
     if (flatLinearRings && flatLinearRings[0]) {
-    const polygon = new Polygon(null);
       const flatCoordinates = flatLinearRings[0];
       const ends = [flatCoordinates.length];
       let i, ii;
@@ -452,24 +421,53 @@ GMLBase.prototype.readPolygon = function(node, objectStack) {
         extend(flatCoordinates, flatLinearRings[i]);
         ends.push(flatCoordinates.length);
       }
-    polygon.setFlatCoordinates(GeometryLayout.XYZ, flatCoordinates, ends);
-    return polygon;
+      return new Polygon(flatCoordinates, GeometryLayout.XYZ, ends);
     } else {
       return undefined;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @private
    * @return {Array.<number>} Flat coordinates.
    */
-GMLBase.prototype.readFlatCoordinatesFromNode_ = function(node, objectStack) {
+  readFlatCoordinatesFromNode_(node, objectStack) {
     return pushParseAndPop(null, this.GEOMETRY_FLAT_COORDINATES_PARSERS_, node, objectStack, this);
-};
+  }
 
+  /**
+   * @inheritDoc
+   */
+  readGeometryFromNode(node, opt_options) {
+    const geometry = this.readGeometryElement(node,
+      [this.getReadOptions(node, opt_options ? opt_options : {})]);
+    return geometry ? geometry : null;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeaturesFromNode(node, opt_options) {
+    const options = {
+      featureType: this.featureType,
+      featureNS: this.featureNS
+    };
+    if (opt_options) {
+      assign(options, this.getReadOptions(node, opt_options));
+    }
+    const features = this.readFeaturesInternal(node, [options]);
+    return features || [];
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readProjectionFromNode(node) {
+    return getProjection(this.srsName ? this.srsName : node.firstElementChild.getAttribute('srsName'));
+  }
+}
 
 /**
  * @const
@@ -557,49 +555,4 @@ GMLBase.prototype.RING_PARSERS = {
   }
 };
 
-
-/**
- * @inheritDoc
- */
-GMLBase.prototype.readGeometryFromNode = function(node, opt_options) {
-  const geometry = this.readGeometryElement(node,
-    [this.getReadOptions(node, opt_options ? opt_options : {})]);
-  return geometry ? geometry : null;
-};
-
-
-/**
- * Read all features from a GML FeatureCollection.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-GMLBase.prototype.readFeatures;
-
-
-/**
- * @inheritDoc
- */
-GMLBase.prototype.readFeaturesFromNode = function(node, opt_options) {
-  const options = {
-    featureType: this.featureType,
-    featureNS: this.featureNS
-  };
-  if (opt_options) {
-    assign(options, this.getReadOptions(node, opt_options));
-  }
-  const features = this.readFeaturesInternal(node, [options]);
-  return features || [];
-};
-
-
-/**
- * @inheritDoc
- */
-GMLBase.prototype.readProjectionFromNode = function(node) {
-  return getProjection(this.srsName ? this.srsName : node.firstElementChild.getAttribute('srsName'));
-};
 export default GMLBase;

src/ol/format/GPX.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/GPX
  */
-import {inherits} from '../util.js';
 import Feature from '../Feature.js';
 import {includes} from '../array.js';
 import {transformWithOptions} from '../format/Feature.js';
@@ -18,52 +17,6 @@ import {createElementNS, makeArrayPusher, makeArraySerializer, makeChildAppender
   XML_SCHEMA_INSTANCE_URI} from '../xml.js';
 
 
-/**
- * @typedef {Object} Options
- * @property {function(module:ol/Feature, Node)} [readExtensions] Callback function
- * to process `extensions` nodes. To prevent memory leaks, this callback function must
- * not store any references to the node. Note that the `extensions`
- * node is not allowed in GPX 1.0. Moreover, only `extensions`
- * nodes from `wpt`, `rte` and `trk` can be processed, as those are
- * directly mapped to a feature.
- */
-
-/**
- * @typedef {Object} LayoutOptions
- * @property {boolean} [hasZ]
- * @property {boolean} [hasM]
- */
-
-/**
- * @classdesc
- * Feature format for reading and writing data in the GPX format.
- *
- * @constructor
- * @extends {module:ol/format/XMLFeature}
- * @param {module:ol/format/GPX~Options=} opt_options Options.
- * @api
- */
-const GPX = function(opt_options) {
-
-  const options = opt_options ? opt_options : {};
-
-  XMLFeature.call(this);
-
-  /**
-   * @inheritDoc
-   */
-  this.dataProjection = getProjection('EPSG:4326');
-
-  /**
-   * @type {function(module:ol/Feature, Node)|undefined}
-   * @private
-   */
-  this.readExtensions_ = options.readExtensions;
-};
-
-inherits(GPX, XMLFeature);
-
-
 /**
  * @const
  * @type {Array.<null|string>}
@@ -117,6 +70,159 @@ const LINK_PARSERS = makeStructureNS(
   });
 
 
+/**
+ * @const
+ * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
+ */
+const GPX_SERIALIZERS = makeStructureNS(
+  NAMESPACE_URIS, {
+    'rte': makeChildAppender(writeRte),
+    'trk': makeChildAppender(writeTrk),
+    'wpt': makeChildAppender(writeWpt)
+  });
+
+
+/**
+ * @typedef {Object} Options
+ * @property {function(module:ol/Feature, Node)} [readExtensions] Callback function
+ * to process `extensions` nodes. To prevent memory leaks, this callback function must
+ * not store any references to the node. Note that the `extensions`
+ * node is not allowed in GPX 1.0. Moreover, only `extensions`
+ * nodes from `wpt`, `rte` and `trk` can be processed, as those are
+ * directly mapped to a feature.
+ */
+
+/**
+ * @typedef {Object} LayoutOptions
+ * @property {boolean} [hasZ]
+ * @property {boolean} [hasM]
+ */
+
+/**
+ * @classdesc
+ * Feature format for reading and writing data in the GPX format.
+ *
+ * Note that {@link module:ol/format/GPX~GPX#readFeature} only reads the first
+ * feature of the source.
+ *
+ * When reading, routes (`<rte>`) are converted into LineString geometries, and
+ * tracks (`<trk>`) into MultiLineString. Any properties on route and track
+ * waypoints are ignored.
+ *
+ * When writing, LineString geometries are output as routes (`<rte>`), and
+ * MultiLineString as tracks (`<trk>`).
+ *
+ * @api
+ */
+class GPX extends XMLFeature {
+
+  /**
+   * @param {module:ol/format/GPX~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
+    super();
+
+    const options = opt_options ? opt_options : {};
+
+
+    /**
+     * @inheritDoc
+     */
+    this.dataProjection = getProjection('EPSG:4326');
+
+    /**
+     * @type {function(module:ol/Feature, Node)|undefined}
+     * @private
+     */
+    this.readExtensions_ = options.readExtensions;
+  }
+
+  /**
+   * @param {Array.<module:ol/Feature>} features List of features.
+   * @private
+   */
+  handleReadExtensions_(features) {
+    if (!features) {
+      features = [];
+    }
+    for (let i = 0, ii = features.length; i < ii; ++i) {
+      const feature = features[i];
+      if (this.readExtensions_) {
+        const extensionsNode = feature.get('extensionsNode_') || null;
+        this.readExtensions_(feature, extensionsNode);
+      }
+      feature.set('extensionsNode_', undefined);
+    }
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeatureFromNode(node, opt_options) {
+    if (!includes(NAMESPACE_URIS, node.namespaceURI)) {
+      return null;
+    }
+    const featureReader = FEATURE_READER[node.localName];
+    if (!featureReader) {
+      return null;
+    }
+    const feature = featureReader(node, [this.getReadOptions(node, opt_options)]);
+    if (!feature) {
+      return null;
+    }
+    this.handleReadExtensions_([feature]);
+    return feature;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeaturesFromNode(node, opt_options) {
+    if (!includes(NAMESPACE_URIS, node.namespaceURI)) {
+      return [];
+    }
+    if (node.localName == 'gpx') {
+      /** @type {Array.<module:ol/Feature>} */
+      const features = pushParseAndPop([], GPX_PARSERS,
+        node, [this.getReadOptions(node, opt_options)]);
+      if (features) {
+        this.handleReadExtensions_(features);
+        return features;
+      } else {
+        return [];
+      }
+    }
+    return [];
+  }
+
+  /**
+   * Encode an array of features in the GPX format as an XML node.
+   * LineString geometries are output as routes (`<rte>`), and MultiLineString
+   * as tracks (`<trk>`).
+   *
+   * @param {Array.<module:ol/Feature>} features Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Options.
+   * @return {Node} Node.
+   * @override
+   * @api
+   */
+  writeFeaturesNode(features, opt_options) {
+    opt_options = this.adaptOptions(opt_options);
+    //FIXME Serialize metadata
+    const gpx = createElementNS('http://www.topografix.com/GPX/1/1', 'gpx');
+    const xmlnsUri = 'http://www.w3.org/2000/xmlns/';
+    gpx.setAttributeNS(xmlnsUri, 'xmlns:xsi', XML_SCHEMA_INSTANCE_URI);
+    gpx.setAttributeNS(XML_SCHEMA_INSTANCE_URI, 'xsi:schemaLocation', SCHEMA_LOCATION);
+    gpx.setAttribute('version', '1.1');
+    gpx.setAttribute('creator', 'OpenLayers');
+
+    pushSerializeAndPop(/** @type {module:ol/xml~NodeStackItem} */
+      ({node: gpx}), GPX_SERIALIZERS, GPX_NODE_FACTORY, features, [opt_options]);
+    return gpx;
+  }
+}
+
+
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
@@ -380,18 +486,6 @@ function GPX_NODE_FACTORY(value, objectStack, opt_nodeName) {
 }
 
 
-/**
- * @const
- * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
- */
-const GPX_SERIALIZERS = makeStructureNS(
-  NAMESPACE_URIS, {
-    'rte': makeChildAppender(writeRte),
-    'trk': makeChildAppender(writeTrk),
-    'wpt': makeChildAppender(writeWpt)
-  });
-
-
 /**
  * @param {Array.<number>} flatCoordinates Flat coordinates.
  * @param {module:ol/format/GPX~LayoutOptions} layoutOptions Layout options.
@@ -553,8 +647,7 @@ function readRte(node, objectStack) {
   const layoutOptions = /** @type {module:ol/format/GPX~LayoutOptions} */ (values['layoutOptions']);
   delete values['layoutOptions'];
   const layout = applyLayoutOptions(layoutOptions, flatCoordinates);
-  const geometry = new LineString(null);
-  geometry.setFlatCoordinates(layout, flatCoordinates);
+  const geometry = new LineString(flatCoordinates, layout);
   transformWithOptions(geometry, false, options);
   const feature = new Feature(geometry);
   feature.setProperties(values);
@@ -585,8 +678,7 @@ function readTrk(node, objectStack) {
   const layoutOptions = /** @type {module:ol/format/GPX~LayoutOptions} */ (values['layoutOptions']);
   delete values['layoutOptions'];
   const layout = applyLayoutOptions(layoutOptions, flatCoordinates, ends);
-  const geometry = new MultiLineString(null);
-  geometry.setFlatCoordinates(layout, flatCoordinates, ends);
+  const geometry = new MultiLineString(flatCoordinates, layout, ends);
   transformWithOptions(geometry, false, options);
   const feature = new Feature(geometry);
   feature.setProperties(values);
@@ -616,106 +708,6 @@ function readWpt(node, objectStack) {
 }
 
 
-/**
- * @param {Array.<module:ol/Feature>} features List of features.
- * @private
- */
-GPX.prototype.handleReadExtensions_ = function(features) {
-  if (!features) {
-    features = [];
-  }
-  for (let i = 0, ii = features.length; i < ii; ++i) {
-    const feature = features[i];
-    if (this.readExtensions_) {
-      const extensionsNode = feature.get('extensionsNode_') || null;
-      this.readExtensions_(feature, extensionsNode);
-    }
-    feature.set('extensionsNode_', undefined);
-  }
-};
-
-
-/**
- * Read the first feature from a GPX source.
- * Routes (`<rte>`) are converted into LineString geometries, and tracks (`<trk>`)
- * into MultiLineString. Any properties on route and track waypoints are ignored.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/Feature} Feature.
- * @api
- */
-GPX.prototype.readFeature;
-
-
-/**
- * @inheritDoc
- */
-GPX.prototype.readFeatureFromNode = function(node, opt_options) {
-  if (!includes(NAMESPACE_URIS, node.namespaceURI)) {
-    return null;
-  }
-  const featureReader = FEATURE_READER[node.localName];
-  if (!featureReader) {
-    return null;
-  }
-  const feature = featureReader(node, [this.getReadOptions(node, opt_options)]);
-  if (!feature) {
-    return null;
-  }
-  this.handleReadExtensions_([feature]);
-  return feature;
-};
-
-
-/**
- * Read all features from a GPX source.
- * Routes (`<rte>`) are converted into LineString geometries, and tracks (`<trk>`)
- * into MultiLineString. Any properties on route and track waypoints are ignored.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-GPX.prototype.readFeatures;
-
-
-/**
- * @inheritDoc
- */
-GPX.prototype.readFeaturesFromNode = function(node, opt_options) {
-  if (!includes(NAMESPACE_URIS, node.namespaceURI)) {
-    return [];
-  }
-  if (node.localName == 'gpx') {
-    /** @type {Array.<module:ol/Feature>} */
-    const features = pushParseAndPop([], GPX_PARSERS,
-      node, [this.getReadOptions(node, opt_options)]);
-    if (features) {
-      this.handleReadExtensions_(features);
-      return features;
-    } else {
-      return [];
-    }
-  }
-  return [];
-};
-
-
-/**
- * Read the projection from a GPX source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @return {module:ol/proj/Projection} Projection.
- * @api
- */
-GPX.prototype.readProjection;
-
-
 /**
  * @param {Node} node Node.
  * @param {string} value Value for the link's `href` attribute.
@@ -862,43 +854,4 @@ function writeWpt(node, feature, objectStack) {
 }
 
 
-/**
- * Encode an array of features in the GPX format.
- * LineString geometries are output as routes (`<rte>`), and MultiLineString
- * as tracks (`<trk>`).
- *
- * @function
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} Result.
- * @api
- */
-GPX.prototype.writeFeatures;
-
-
-/**
- * Encode an array of features in the GPX format as an XML node.
- * LineString geometries are output as routes (`<rte>`), and MultiLineString
- * as tracks (`<trk>`).
- *
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Options.
- * @return {Node} Node.
- * @override
- * @api
- */
-GPX.prototype.writeFeaturesNode = function(features, opt_options) {
-  opt_options = this.adaptOptions(opt_options);
-  //FIXME Serialize metadata
-  const gpx = createElementNS('http://www.topografix.com/GPX/1/1', 'gpx');
-  const xmlnsUri = 'http://www.w3.org/2000/xmlns/';
-  gpx.setAttributeNS(xmlnsUri, 'xmlns:xsi', XML_SCHEMA_INSTANCE_URI);
-  gpx.setAttributeNS(XML_SCHEMA_INSTANCE_URI, 'xsi:schemaLocation', SCHEMA_LOCATION);
-  gpx.setAttribute('version', '1.1');
-  gpx.setAttribute('creator', 'OpenLayers');
-
-  pushSerializeAndPop(/** @type {module:ol/xml~NodeStackItem} */
-    ({node: gpx}), GPX_SERIALIZERS, GPX_NODE_FACTORY, features, [opt_options]);
-  return gpx;
-};
 export default GPX;

src/ol/format/GeoJSON.js

@@ -4,7 +4,6 @@
 // TODO: serialize dataProjection as crs member when writing
 // see https://github.com/openlayers/openlayers/issues/2078
 
-import {inherits} from '../util.js';
 import {assert} from '../asserts.js';
 import Feature from '../Feature.js';
 import {transformWithOptions} from '../format/Feature.js';
@@ -37,16 +36,18 @@ import {get as getProjection} from '../proj.js';
  * @classdesc
  * Feature format for reading and writing data in the GeoJSON format.
  *
- * @constructor
- * @extends {module:ol/format/JSONFeature}
- * @param {module:ol/format/GeoJSON~Options=} opt_options Options.
   * @api
  */
-const GeoJSON = function(opt_options) {
+class GeoJSON extends JSONFeature {
+
+  /**
+   * @param {module:ol/format/GeoJSON~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
 
     const options = opt_options ? opt_options : {};
 
-  JSONFeature.call(this);
+    super();
 
     /**
      * @inheritDoc
@@ -73,9 +74,159 @@ const GeoJSON = function(opt_options) {
      */
     this.extractGeometryName_ = options.extractGeometryName;
 
-};
+  }
 
-inherits(GeoJSON, JSONFeature);
+  /**
+   * @inheritDoc
+   */
+  readFeatureFromObject(object, opt_options) {
+    /**
+     * @type {GeoJSONFeature}
+     */
+    let geoJSONFeature = null;
+    if (object.type === 'Feature') {
+      geoJSONFeature = /** @type {GeoJSONFeature} */ (object);
+    } else {
+      geoJSONFeature = /** @type {GeoJSONFeature} */ ({
+        type: 'Feature',
+        geometry: /** @type {GeoJSONGeometry|GeoJSONGeometryCollection} */ (object)
+      });
+    }
+
+    const geometry = readGeometry(geoJSONFeature.geometry, opt_options);
+    const feature = new Feature();
+    if (this.geometryName_) {
+      feature.setGeometryName(this.geometryName_);
+    } else if (this.extractGeometryName_ && geoJSONFeature.geometry_name !== undefined) {
+      feature.setGeometryName(geoJSONFeature.geometry_name);
+    }
+    feature.setGeometry(geometry);
+    if (geoJSONFeature.id !== undefined) {
+      feature.setId(geoJSONFeature.id);
+    }
+    if (geoJSONFeature.properties) {
+      feature.setProperties(geoJSONFeature.properties);
+    }
+    return feature;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeaturesFromObject(object, opt_options) {
+    const geoJSONObject = /** @type {GeoJSONObject} */ (object);
+    /** @type {Array.<module:ol/Feature>} */
+    let features = null;
+    if (geoJSONObject.type === 'FeatureCollection') {
+      const geoJSONFeatureCollection = /** @type {GeoJSONFeatureCollection} */ (object);
+      features = [];
+      const geoJSONFeatures = geoJSONFeatureCollection.features;
+      for (let i = 0, ii = geoJSONFeatures.length; i < ii; ++i) {
+        features.push(this.readFeatureFromObject(geoJSONFeatures[i], opt_options));
+      }
+    } else {
+      features = [this.readFeatureFromObject(object, opt_options)];
+    }
+    return features;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readGeometryFromObject(object, opt_options) {
+    return readGeometry(/** @type {GeoJSONGeometry} */ (object), opt_options);
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readProjectionFromObject(object) {
+    const geoJSONObject = /** @type {GeoJSONObject} */ (object);
+    const crs = geoJSONObject.crs;
+    let projection;
+    if (crs) {
+      if (crs.type == 'name') {
+        projection = getProjection(crs.properties.name);
+      } else {
+        assert(false, 36); // Unknown SRS type
+      }
+    } else {
+      projection = this.dataProjection;
+    }
+    return (
+      /** @type {module:ol/proj/Projection} */ (projection)
+    );
+  }
+
+  /**
+   * Encode a feature as a GeoJSON Feature object.
+   *
+   * @param {module:ol/Feature} feature Feature.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {GeoJSONFeature} Object.
+   * @override
+   * @api
+   */
+  writeFeatureObject(feature, opt_options) {
+    opt_options = this.adaptOptions(opt_options);
+
+    const object = /** @type {GeoJSONFeature} */ ({
+      'type': 'Feature'
+    });
+    const id = feature.getId();
+    if (id !== undefined) {
+      object.id = id;
+    }
+    const geometry = feature.getGeometry();
+    if (geometry) {
+      object.geometry = writeGeometry(geometry, opt_options);
+    } else {
+      object.geometry = null;
+    }
+    const properties = feature.getProperties();
+    delete properties[feature.getGeometryName()];
+    if (!isEmpty(properties)) {
+      object.properties = properties;
+    } else {
+      object.properties = null;
+    }
+    return object;
+  }
+
+  /**
+   * Encode an array of features as a GeoJSON object.
+   *
+   * @param {Array.<module:ol/Feature>} features Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {GeoJSONFeatureCollection} GeoJSON Object.
+   * @override
+   * @api
+   */
+  writeFeaturesObject(features, opt_options) {
+    opt_options = this.adaptOptions(opt_options);
+    const objects = [];
+    for (let i = 0, ii = features.length; i < ii; ++i) {
+      objects.push(this.writeFeatureObject(features[i], opt_options));
+    }
+    return /** @type {GeoJSONFeatureCollection} */ ({
+      type: 'FeatureCollection',
+      features: objects
+    });
+  }
+
+  /**
+   * Encode a geometry as a GeoJSON object.
+   *
+   * @param {module:ol/geom/Geometry} geometry Geometry.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {GeoJSONGeometry|GeoJSONGeometryCollection} Object.
+   * @override
+   * @api
+   */
+  writeGeometryObject(geometry, opt_options) {
+    return writeGeometry(geometry, this.adaptOptions(opt_options));
+  }
+}
 
 
 /**
@@ -325,249 +476,4 @@ function writePolygonGeometry(geometry, opt_options) {
 }
 
 
-/**
- * Read a feature from a GeoJSON Feature source.  Only works for Feature or
- * geometry types.  Use {@link module:ol/format/GeoJSON#readFeatures} to read
- * FeatureCollection source. If feature at source has an id, it will be used
- * as Feature id by calling {@link module:ol/Feature#setId} internally.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/Feature} Feature.
- * @api
- */
-GeoJSON.prototype.readFeature;
-
-
-/**
- * Read all features from a GeoJSON source.  Works for all GeoJSON types.
- * If the source includes only geometries, features will be created with those
- * geometries.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-GeoJSON.prototype.readFeatures;
-
-
-/**
- * @inheritDoc
- */
-GeoJSON.prototype.readFeatureFromObject = function(object, opt_options) {
-  /**
-   * @type {GeoJSONFeature}
-   */
-  let geoJSONFeature = null;
-  if (object.type === 'Feature') {
-    geoJSONFeature = /** @type {GeoJSONFeature} */ (object);
-  } else {
-    geoJSONFeature = /** @type {GeoJSONFeature} */ ({
-      type: 'Feature',
-      geometry: /** @type {GeoJSONGeometry|GeoJSONGeometryCollection} */ (object)
-    });
-  }
-
-  const geometry = readGeometry(geoJSONFeature.geometry, opt_options);
-  const feature = new Feature();
-  if (this.geometryName_) {
-    feature.setGeometryName(this.geometryName_);
-  } else if (this.extractGeometryName_ && geoJSONFeature.geometry_name !== undefined) {
-    feature.setGeometryName(geoJSONFeature.geometry_name);
-  }
-  feature.setGeometry(geometry);
-  if (geoJSONFeature.id !== undefined) {
-    feature.setId(geoJSONFeature.id);
-  }
-  if (geoJSONFeature.properties) {
-    feature.setProperties(geoJSONFeature.properties);
-  }
-  return feature;
-};
-
-
-/**
- * @inheritDoc
- */
-GeoJSON.prototype.readFeaturesFromObject = function(object, opt_options) {
-  const geoJSONObject = /** @type {GeoJSONObject} */ (object);
-  /** @type {Array.<module:ol/Feature>} */
-  let features = null;
-  if (geoJSONObject.type === 'FeatureCollection') {
-    const geoJSONFeatureCollection = /** @type {GeoJSONFeatureCollection} */ (object);
-    features = [];
-    const geoJSONFeatures = geoJSONFeatureCollection.features;
-    for (let i = 0, ii = geoJSONFeatures.length; i < ii; ++i) {
-      features.push(this.readFeatureFromObject(geoJSONFeatures[i], opt_options));
-    }
-  } else {
-    features = [this.readFeatureFromObject(object, opt_options)];
-  }
-  return features;
-};
-
-
-/**
- * Read a geometry from a GeoJSON source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/geom/Geometry} Geometry.
- * @api
- */
-GeoJSON.prototype.readGeometry;
-
-
-/**
- * @inheritDoc
- */
-GeoJSON.prototype.readGeometryFromObject = function(object, opt_options) {
-  return readGeometry(/** @type {GeoJSONGeometry} */ (object), opt_options);
-};
-
-
-/**
- * Read the projection from a GeoJSON source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @return {module:ol/proj/Projection} Projection.
- * @api
- */
-GeoJSON.prototype.readProjection;
-
-
-/**
- * @inheritDoc
- */
-GeoJSON.prototype.readProjectionFromObject = function(object) {
-  const geoJSONObject = /** @type {GeoJSONObject} */ (object);
-  const crs = geoJSONObject.crs;
-  let projection;
-  if (crs) {
-    if (crs.type == 'name') {
-      projection = getProjection(crs.properties.name);
-    } else {
-      assert(false, 36); // Unknown SRS type
-    }
-  } else {
-    projection = this.dataProjection;
-  }
-  return (
-    /** @type {module:ol/proj/Projection} */ (projection)
-  );
-};
-
-
-/**
- * Encode a feature as a GeoJSON Feature string.
- *
- * @function
- * @param {module:ol/Feature} feature Feature.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} GeoJSON.
- * @override
- * @api
- */
-GeoJSON.prototype.writeFeature;
-
-
-/**
- * Encode a feature as a GeoJSON Feature object.
- *
- * @param {module:ol/Feature} feature Feature.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {GeoJSONFeature} Object.
- * @override
- * @api
- */
-GeoJSON.prototype.writeFeatureObject = function(feature, opt_options) {
-  opt_options = this.adaptOptions(opt_options);
-
-  const object = /** @type {GeoJSONFeature} */ ({
-    'type': 'Feature'
-  });
-  const id = feature.getId();
-  if (id !== undefined) {
-    object.id = id;
-  }
-  const geometry = feature.getGeometry();
-  if (geometry) {
-    object.geometry = writeGeometry(geometry, opt_options);
-  } else {
-    object.geometry = null;
-  }
-  const properties = feature.getProperties();
-  delete properties[feature.getGeometryName()];
-  if (!isEmpty(properties)) {
-    object.properties = properties;
-  } else {
-    object.properties = null;
-  }
-  return object;
-};
-
-
-/**
- * Encode an array of features as GeoJSON.
- *
- * @function
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} GeoJSON.
- * @api
- */
-GeoJSON.prototype.writeFeatures;
-
-
-/**
- * Encode an array of features as a GeoJSON object.
- *
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {GeoJSONFeatureCollection} GeoJSON Object.
- * @override
- * @api
- */
-GeoJSON.prototype.writeFeaturesObject = function(features, opt_options) {
-  opt_options = this.adaptOptions(opt_options);
-  const objects = [];
-  for (let i = 0, ii = features.length; i < ii; ++i) {
-    objects.push(this.writeFeatureObject(features[i], opt_options));
-  }
-  return /** @type {GeoJSONFeatureCollection} */ ({
-    type: 'FeatureCollection',
-    features: objects
-  });
-};
-
-
-/**
- * Encode a geometry as a GeoJSON string.
- *
- * @function
- * @param {module:ol/geom/Geometry} geometry Geometry.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} GeoJSON.
- * @api
- */
-GeoJSON.prototype.writeGeometry;
-
-
-/**
- * Encode a geometry as a GeoJSON object.
- *
- * @param {module:ol/geom/Geometry} geometry Geometry.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {GeoJSONGeometry|GeoJSONGeometryCollection} Object.
- * @override
- * @api
- */
-GeoJSON.prototype.writeGeometryObject = function(geometry, opt_options) {
-  return writeGeometry(geometry, this.adaptOptions(opt_options));
-};
 export default GeoJSON;

src/ol/format/IGC.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/IGC
  */
-import {inherits} from '../util.js';
 import Feature from '../Feature.js';
 import {transformWithOptions} from '../format/Feature.js';
 import TextFeature from '../format/TextFeature.js';
@@ -19,44 +18,6 @@ const IGCZ = {
   NONE: 'none'
 };
 
-
-/**
- * @typedef {Object} Options
- * @property {IGCZ|string} [altitudeMode='none'] Altitude mode. Possible
- * values are `'barometric'`, `'gps'`, and `'none'`.
- */
-
-
-/**
- * @classdesc
- * Feature format for `*.igc` flight recording files.
- *
- * @constructor
- * @extends {module:ol/format/TextFeature}
- * @param {module:ol/format/IGC~Options=} opt_options Options.
- * @api
- */
-const IGC = function(opt_options) {
-
-  const options = opt_options ? opt_options : {};
-
-  TextFeature.call(this);
-
-  /**
-   * @inheritDoc
-   */
-  this.dataProjection = getProjection('EPSG:4326');
-
-  /**
-   * @private
-   * @type {IGCZ}
-   */
-  this.altitudeMode_ = options.altitudeMode ? options.altitudeMode : IGCZ.NONE;
-};
-
-inherits(IGC, TextFeature);
-
-
 /**
  * @const
  * @type {RegExp}
@@ -89,21 +50,48 @@ const NEWLINE_RE = /\r\n|\r|\n/;
 
 
 /**
- * Read the feature from the IGC source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/Feature} Feature.
- * @api
+ * @typedef {Object} Options
+ * @property {IGCZ|string} [altitudeMode='none'] Altitude mode. Possible
+ * values are `'barometric'`, `'gps'`, and `'none'`.
  */
-IGC.prototype.readFeature;
 
 
 /**
+ * @classdesc
+ * Feature format for `*.igc` flight recording files.
+ *
+ * As IGC sources contain a single feature,
+ * {@link module:ol/format/IGC~IGC#readFeatures} will return the feature in an
+ * array
+ *
+ * @api
+ */
+class IGC extends TextFeature {
+
+  /**
+   * @param {module:ol/format/IGC~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
+    super();
+
+    const options = opt_options ? opt_options : {};
+
+    /**
      * @inheritDoc
      */
-IGC.prototype.readFeatureFromText = function(text, opt_options) {
+    this.dataProjection = getProjection('EPSG:4326');
+
+    /**
+     * @private
+     * @type {IGCZ}
+     */
+    this.altitudeMode_ = options.altitudeMode ? options.altitudeMode : IGCZ.NONE;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeatureFromText(text, opt_options) {
     const altitudeMode = this.altitudeMode_;
     const lines = text.split(NEWLINE_RE);
     /** @type {Object.<string, string>} */
@@ -168,76 +156,48 @@ IGC.prototype.readFeatureFromText = function(text, opt_options) {
     if (flatCoordinates.length === 0) {
       return null;
     }
-  const lineString = new LineString(null);
     const layout = altitudeMode == IGCZ.NONE ? GeometryLayout.XYM : GeometryLayout.XYZM;
-  lineString.setFlatCoordinates(layout, flatCoordinates);
+    const lineString = new LineString(flatCoordinates, layout);
     const feature = new Feature(transformWithOptions(lineString, false, opt_options));
     feature.setProperties(properties);
     return feature;
-};
+  }
 
-
-/**
- * Read the feature from the source. As IGC sources contain a single
- * feature, this will return the feature in an array.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-IGC.prototype.readFeatures;
-
-
-/**
+  /**
    * @inheritDoc
    */
-IGC.prototype.readFeaturesFromText = function(text, opt_options) {
+  readFeaturesFromText(text, opt_options) {
     const feature = this.readFeatureFromText(text, opt_options);
     if (feature) {
       return [feature];
     } else {
       return [];
     }
-};
+  }
 
-
-/**
- * Read the projection from the IGC source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @return {module:ol/proj/Projection} Projection.
- * @api
- */
-IGC.prototype.readProjection;
-
-
-/**
+  /**
    * Not implemented.
    * @inheritDoc
    */
-IGC.prototype.writeFeatureText = function(feature, opt_options) {};
+  writeFeatureText(feature, opt_options) {}
 
-
-/**
+  /**
    * Not implemented.
    * @inheritDoc
    */
-IGC.prototype.writeFeaturesText = function(features, opt_options) {};
+  writeFeaturesText(features, opt_options) {}
 
-
-/**
+  /**
    * Not implemented.
    * @inheritDoc
    */
-IGC.prototype.writeGeometryText = function(geometry, opt_options) {};
+  writeGeometryText(geometry, opt_options) {}
 
-
-/**
+  /**
    * Not implemented.
    * @inheritDoc
    */
-IGC.prototype.readGeometryFromText = function(text, opt_options) {};
+  readGeometryFromText(text, opt_options) {}
+}
+
 export default IGC;

src/ol/format/JSONFeature.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/JSONFeature
  */
-import {inherits} from '../util.js';
 import FeatureFormat from '../format/Feature.js';
 import FormatType from '../format/FormatType.js';
 
@@ -11,15 +10,167 @@ import FormatType from '../format/FormatType.js';
  * instantiated in apps.
  * Base class for JSON feature formats.
  *
- * @constructor
  * @abstract
- * @extends {module:ol/format/Feature}
  */
-const JSONFeature = function() {
-  FeatureFormat.call(this);
-};
+class JSONFeature extends FeatureFormat {
+  constructor() {
+    super();
+  }
 
-inherits(JSONFeature, FeatureFormat);
+  /**
+   * @inheritDoc
+   */
+  getType() {
+    return FormatType.JSON;
+  }
+
+  /**
+   * Read a feature.  Only works for a single feature. Use `readFeatures` to
+   * read a feature collection.
+   *
+   * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @return {module:ol/Feature} Feature.
+   * @api
+   */
+  readFeature(source, opt_options) {
+    return this.readFeatureFromObject(
+      getObject(source), this.getReadOptions(source, opt_options));
+  }
+
+  /**
+   * Read all features.  Works with both a single feature and a feature
+   * collection.
+   *
+   * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @return {Array.<module:ol/Feature>} Features.
+   * @api
+   */
+  readFeatures(source, opt_options) {
+    return this.readFeaturesFromObject(
+      getObject(source), this.getReadOptions(source, opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {Object} object Object.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @protected
+   * @return {module:ol/Feature} Feature.
+   */
+  readFeatureFromObject(object, opt_options) {}
+
+  /**
+   * @abstract
+   * @param {Object} object Object.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @protected
+   * @return {Array.<module:ol/Feature>} Features.
+   */
+  readFeaturesFromObject(object, opt_options) {}
+
+  /**
+   * Read a geometry.
+   *
+   * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @return {module:ol/geom/Geometry} Geometry.
+   * @api
+   */
+  readGeometry(source, opt_options) {
+    return this.readGeometryFromObject(
+      getObject(source), this.getReadOptions(source, opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {Object} object Object.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @protected
+   * @return {module:ol/geom/Geometry} Geometry.
+   */
+  readGeometryFromObject(object, opt_options) {}
+
+  /**
+   * Read the projection.
+   *
+   * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+   * @return {module:ol/proj/Projection} Projection.
+   * @api
+   */
+  readProjection(source) {
+    return this.readProjectionFromObject(getObject(source));
+  }
+
+  /**
+   * @abstract
+   * @param {Object} object Object.
+   * @protected
+   * @return {module:ol/proj/Projection} Projection.
+   */
+  readProjectionFromObject(object) {}
+
+  /**
+   * Encode a feature as string.
+   *
+   * @param {module:ol/Feature} feature Feature.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {string} Encoded feature.
+   * @api
+   */
+  writeFeature(feature, opt_options) {
+    return JSON.stringify(this.writeFeatureObject(feature, opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {module:ol/Feature} feature Feature.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {Object} Object.
+   */
+  writeFeatureObject(feature, opt_options) {}
+
+  /**
+   * Encode an array of features as string.
+   *
+   * @param {Array.<module:ol/Feature>} features Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {string} Encoded features.
+   * @api
+   */
+  writeFeatures(features, opt_options) {
+    return JSON.stringify(this.writeFeaturesObject(features, opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {Array.<module:ol/Feature>} features Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {Object} Object.
+   */
+  writeFeaturesObject(features, opt_options) {}
+
+  /**
+   * Encode a geometry as string.
+   *
+   * @param {module:ol/geom/Geometry} geometry Geometry.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {string} Encoded geometry.
+   * @api
+   */
+  writeGeometry(geometry, opt_options) {
+    return JSON.stringify(this.writeGeometryObject(geometry, opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {module:ol/geom/Geometry} geometry Geometry.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {Object} Object.
+   */
+  writeGeometryObject(geometry, opt_options) {}
+}
 
 
 /**
@@ -38,135 +189,4 @@ function getObject(source) {
 }
 
 
-/**
- * @inheritDoc
- */
-JSONFeature.prototype.getType = function() {
-  return FormatType.JSON;
-};
-
-
-/**
- * @inheritDoc
- */
-JSONFeature.prototype.readFeature = function(source, opt_options) {
-  return this.readFeatureFromObject(
-    getObject(source), this.getReadOptions(source, opt_options));
-};
-
-
-/**
- * @inheritDoc
- */
-JSONFeature.prototype.readFeatures = function(source, opt_options) {
-  return this.readFeaturesFromObject(
-    getObject(source), this.getReadOptions(source, opt_options));
-};
-
-
-/**
- * @abstract
- * @param {Object} object Object.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @protected
- * @return {module:ol/Feature} Feature.
- */
-JSONFeature.prototype.readFeatureFromObject = function(object, opt_options) {};
-
-
-/**
- * @abstract
- * @param {Object} object Object.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @protected
- * @return {Array.<module:ol/Feature>} Features.
- */
-JSONFeature.prototype.readFeaturesFromObject = function(object, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-JSONFeature.prototype.readGeometry = function(source, opt_options) {
-  return this.readGeometryFromObject(
-    getObject(source), this.getReadOptions(source, opt_options));
-};
-
-
-/**
- * @abstract
- * @param {Object} object Object.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @protected
- * @return {module:ol/geom/Geometry} Geometry.
- */
-JSONFeature.prototype.readGeometryFromObject = function(object, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-JSONFeature.prototype.readProjection = function(source) {
-  return this.readProjectionFromObject(getObject(source));
-};
-
-
-/**
- * @abstract
- * @param {Object} object Object.
- * @protected
- * @return {module:ol/proj/Projection} Projection.
- */
-JSONFeature.prototype.readProjectionFromObject = function(object) {};
-
-
-/**
- * @inheritDoc
- */
-JSONFeature.prototype.writeFeature = function(feature, opt_options) {
-  return JSON.stringify(this.writeFeatureObject(feature, opt_options));
-};
-
-
-/**
- * @abstract
- * @param {module:ol/Feature} feature Feature.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {Object} Object.
- */
-JSONFeature.prototype.writeFeatureObject = function(feature, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-JSONFeature.prototype.writeFeatures = function(features, opt_options) {
-  return JSON.stringify(this.writeFeaturesObject(features, opt_options));
-};
-
-
-/**
- * @abstract
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {Object} Object.
- */
-JSONFeature.prototype.writeFeaturesObject = function(features, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-JSONFeature.prototype.writeGeometry = function(geometry, opt_options) {
-  return JSON.stringify(this.writeGeometryObject(geometry, opt_options));
-};
-
-
-/**
- * @abstract
- * @param {module:ol/geom/Geometry} geometry Geometry.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {Object} Object.
- */
-JSONFeature.prototype.writeGeometryObject = function(geometry, opt_options) {};
 export default JSONFeature;

src/ol/format/MVT.js

@@ -3,7 +3,6 @@
  */
 //FIXME Implement projection handling
 
-import {inherits} from '../util.js';
 import {assert} from '../asserts.js';
 import PBF from 'pbf';
 import FeatureFormat, {transformWithOptions} from '../format/Feature.js';
@@ -42,14 +41,16 @@ import RenderFeature from '../render/Feature.js';
  * @classdesc
  * Feature format for reading data in the Mapbox MVT format.
  *
- * @constructor
- * @extends {module:ol/format/Feature}
  * @param {module:ol/format/MVT~Options=} opt_options Options.
  * @api
  */
-const MVT = function(opt_options) {
+class MVT extends FeatureFormat {
 
-  FeatureFormat.call(this);
+  /**
+   * @param {module:ol/format/MVT~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
+    super();
 
     const options = opt_options ? opt_options : {};
 
@@ -94,9 +95,228 @@ const MVT = function(opt_options) {
      */
     this.extent_ = null;
 
-};
+  }
 
-inherits(MVT, FeatureFormat);
+  /**
+   * Read the raw geometry from the pbf offset stored in a raw feature's geometry
+   * property.
+   * @suppress {missingProperties}
+   * @param {Object} pbf PBF.
+   * @param {Object} feature Raw feature.
+   * @param {Array.<number>} flatCoordinates Array to store flat coordinates in.
+   * @param {Array.<number>} ends Array to store ends in.
+   * @private
+   */
+  readRawGeometry_(pbf, feature, flatCoordinates, ends) {
+    pbf.pos = feature.geometry;
+
+    const end = pbf.readVarint() + pbf.pos;
+    let cmd = 1;
+    let length = 0;
+    let x = 0;
+    let y = 0;
+    let coordsLen = 0;
+    let currentEnd = 0;
+
+    while (pbf.pos < end) {
+      if (!length) {
+        const cmdLen = pbf.readVarint();
+        cmd = cmdLen & 0x7;
+        length = cmdLen >> 3;
+      }
+
+      length--;
+
+      if (cmd === 1 || cmd === 2) {
+        x += pbf.readSVarint();
+        y += pbf.readSVarint();
+
+        if (cmd === 1) { // moveTo
+          if (coordsLen > currentEnd) {
+            ends.push(coordsLen);
+            currentEnd = coordsLen;
+          }
+        }
+
+        flatCoordinates.push(x, y);
+        coordsLen += 2;
+
+      } else if (cmd === 7) {
+
+        if (coordsLen > currentEnd) {
+          // close polygon
+          flatCoordinates.push(
+            flatCoordinates[currentEnd], flatCoordinates[currentEnd + 1]);
+          coordsLen += 2;
+        }
+
+      } else {
+        assert(false, 59); // Invalid command found in the PBF
+      }
+    }
+
+    if (coordsLen > currentEnd) {
+      ends.push(coordsLen);
+      currentEnd = coordsLen;
+    }
+
+  }
+
+  /**
+   * @private
+   * @param {Object} pbf PBF
+   * @param {Object} rawFeature Raw Mapbox feature.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @return {module:ol/Feature|module:ol/render/Feature} Feature.
+   */
+  createFeature_(pbf, rawFeature, opt_options) {
+    const type = rawFeature.type;
+    if (type === 0) {
+      return null;
+    }
+
+    let feature;
+    const id = rawFeature.id;
+    const values = rawFeature.properties;
+    values[this.layerName_] = rawFeature.layer.name;
+
+    const flatCoordinates = [];
+    const ends = [];
+    this.readRawGeometry_(pbf, rawFeature, flatCoordinates, ends);
+
+    const geometryType = getGeometryType(type, ends.length);
+
+    if (this.featureClass_ === RenderFeature) {
+      feature = new this.featureClass_(geometryType, flatCoordinates, ends, values, id);
+    } else {
+      let geom;
+      if (geometryType == GeometryType.POLYGON) {
+        const endss = [];
+        let offset = 0;
+        let prevEndIndex = 0;
+        for (let i = 0, ii = ends.length; i < ii; ++i) {
+          const end = ends[i];
+          if (!linearRingIsClockwise(flatCoordinates, offset, end, 2)) {
+            endss.push(ends.slice(prevEndIndex, i));
+            prevEndIndex = i;
+          }
+          offset = end;
+        }
+        if (endss.length > 1) {
+          geom = new MultiPolygon(flatCoordinates, GeometryLayout.XY, endss);
+        } else {
+          geom = new Polygon(flatCoordinates, GeometryLayout.XY, ends);
+        }
+      } else {
+        geom = geometryType === GeometryType.POINT ? new Point(flatCoordinates, GeometryLayout.XY) :
+          geometryType === GeometryType.LINE_STRING ? new LineString(flatCoordinates, GeometryLayout.XY) :
+            geometryType === GeometryType.POLYGON ? new Polygon(flatCoordinates, GeometryLayout.XY, ends) :
+              geometryType === GeometryType.MULTI_POINT ? new MultiPoint(flatCoordinates, GeometryLayout.XY) :
+                geometryType === GeometryType.MULTI_LINE_STRING ? new MultiLineString(flatCoordinates, GeometryLayout.XY, ends) :
+                  null;
+      }
+      feature = new this.featureClass_();
+      if (this.geometryName_) {
+        feature.setGeometryName(this.geometryName_);
+      }
+      const geometry = transformWithOptions(geom, false, this.adaptOptions(opt_options));
+      feature.setGeometry(geometry);
+      feature.setId(id);
+      feature.setProperties(values);
+    }
+
+    return feature;
+  }
+
+  /**
+   * @inheritDoc
+   * @api
+   */
+  getLastExtent() {
+    return this.extent_;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  getType() {
+    return FormatType.ARRAY_BUFFER;
+  }
+
+  /**
+   * @inheritDoc
+   * @api
+   */
+  readFeatures(source, opt_options) {
+    const layers = this.layers_;
+
+    const pbf = new PBF(/** @type {ArrayBuffer} */ (source));
+    const pbfLayers = pbf.readFields(layersPBFReader, {});
+    /** @type {Array.<module:ol/Feature|module:ol/render/Feature>} */
+    const features = [];
+    for (const name in pbfLayers) {
+      if (layers && layers.indexOf(name) == -1) {
+        continue;
+      }
+      const pbfLayer = pbfLayers[name];
+
+      for (let i = 0, ii = pbfLayer.length; i < ii; ++i) {
+        const rawFeature = readRawFeature(pbf, pbfLayer, i);
+        features.push(this.createFeature_(pbf, rawFeature));
+      }
+      this.extent_ = pbfLayer ? [0, 0, pbfLayer.extent, pbfLayer.extent] : null;
+    }
+
+    return features;
+  }
+
+  /**
+   * @inheritDoc
+   * @api
+   */
+  readProjection(source) {
+    return this.dataProjection;
+  }
+
+  /**
+   * Sets the layers that features will be read from.
+   * @param {Array.<string>} layers Layers.
+   * @api
+   */
+  setLayers(layers) {
+    this.layers_ = layers;
+  }
+
+  /**
+   * Not implemented.
+   * @override
+   */
+  readFeature() {}
+
+  /**
+   * Not implemented.
+   * @override
+   */
+  readGeometry() {}
+
+  /**
+   * Not implemented.
+   * @override
+   */
+  writeFeature() {}
+
+  /**
+   * Not implemented.
+   * @override
+   */
+  writeGeometry() {}
+
+  /**
+   * Not implemented.
+   * @override
+   */
+  writeFeatures() {}
+}
 
 
 /**
@@ -201,72 +421,6 @@ function readRawFeature(pbf, layer, i) {
 }
 
 
-/**
- * Read the raw geometry from the pbf offset stored in a raw feature's geometry
- * property.
- * @suppress {missingProperties}
- * @param {Object} pbf PBF.
- * @param {Object} feature Raw feature.
- * @param {Array.<number>} flatCoordinates Array to store flat coordinates in.
- * @param {Array.<number>} ends Array to store ends in.
- * @private
- */
-MVT.prototype.readRawGeometry_ = function(pbf, feature, flatCoordinates, ends) {
-  pbf.pos = feature.geometry;
-
-  const end = pbf.readVarint() + pbf.pos;
-  let cmd = 1;
-  let length = 0;
-  let x = 0;
-  let y = 0;
-  let coordsLen = 0;
-  let currentEnd = 0;
-
-  while (pbf.pos < end) {
-    if (!length) {
-      const cmdLen = pbf.readVarint();
-      cmd = cmdLen & 0x7;
-      length = cmdLen >> 3;
-    }
-
-    length--;
-
-    if (cmd === 1 || cmd === 2) {
-      x += pbf.readSVarint();
-      y += pbf.readSVarint();
-
-      if (cmd === 1) { // moveTo
-        if (coordsLen > currentEnd) {
-          ends.push(coordsLen);
-          currentEnd = coordsLen;
-        }
-      }
-
-      flatCoordinates.push(x, y);
-      coordsLen += 2;
-
-    } else if (cmd === 7) {
-
-      if (coordsLen > currentEnd) {
-        // close polygon
-        flatCoordinates.push(
-          flatCoordinates[currentEnd], flatCoordinates[currentEnd + 1]);
-        coordsLen += 2;
-      }
-
-    } else {
-      assert(false, 59); // Invalid command found in the PBF
-    }
-  }
-
-  if (coordsLen > currentEnd) {
-    ends.push(coordsLen);
-    currentEnd = coordsLen;
-  }
-
-};
-
-
 /**
  * @suppress {missingProperties}
  * @param {number} type The raw feature's geometry type
@@ -292,170 +446,4 @@ function getGeometryType(type, numEnds) {
   return geometryType;
 }
 
-/**
- * @private
- * @param {Object} pbf PBF
- * @param {Object} rawFeature Raw Mapbox feature.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/Feature|module:ol/render/Feature} Feature.
- */
-MVT.prototype.createFeature_ = function(pbf, rawFeature, opt_options) {
-  const type = rawFeature.type;
-  if (type === 0) {
-    return null;
-  }
-
-  let feature;
-  const id = rawFeature.id;
-  const values = rawFeature.properties;
-  values[this.layerName_] = rawFeature.layer.name;
-
-  const flatCoordinates = [];
-  let ends = [];
-  this.readRawGeometry_(pbf, rawFeature, flatCoordinates, ends);
-
-  const geometryType = getGeometryType(type, ends.length);
-
-  if (this.featureClass_ === RenderFeature) {
-    feature = new this.featureClass_(geometryType, flatCoordinates, ends, values, id);
-  } else {
-    let geom;
-    if (geometryType == GeometryType.POLYGON) {
-      const endss = [];
-      let offset = 0;
-      let prevEndIndex = 0;
-      for (let i = 0, ii = ends.length; i < ii; ++i) {
-        const end = ends[i];
-        if (!linearRingIsClockwise(flatCoordinates, offset, end, 2)) {
-          endss.push(ends.slice(prevEndIndex, i));
-          prevEndIndex = i;
-        }
-        offset = end;
-      }
-      if (endss.length > 1) {
-        ends = endss;
-        geom = new MultiPolygon(null);
-      } else {
-        geom = new Polygon(null);
-      }
-    } else {
-      geom = geometryType === GeometryType.POINT ? new Point(null) :
-        geometryType === GeometryType.LINE_STRING ? new LineString(null) :
-          geometryType === GeometryType.POLYGON ? new Polygon(null) :
-            geometryType === GeometryType.MULTI_POINT ? new MultiPoint (null) :
-              geometryType === GeometryType.MULTI_LINE_STRING ? new MultiLineString(null) :
-                null;
-    }
-    geom.setFlatCoordinates(GeometryLayout.XY, flatCoordinates, ends);
-    feature = new this.featureClass_();
-    if (this.geometryName_) {
-      feature.setGeometryName(this.geometryName_);
-    }
-    const geometry = transformWithOptions(geom, false, this.adaptOptions(opt_options));
-    feature.setGeometry(geometry);
-    feature.setId(id);
-    feature.setProperties(values);
-  }
-
-  return feature;
-};
-
-
-/**
- * @inheritDoc
- * @api
- */
-MVT.prototype.getLastExtent = function() {
-  return this.extent_;
-};
-
-
-/**
- * @inheritDoc
- */
-MVT.prototype.getType = function() {
-  return FormatType.ARRAY_BUFFER;
-};
-
-
-/**
- * @inheritDoc
- * @api
- */
-MVT.prototype.readFeatures = function(source, opt_options) {
-  const layers = this.layers_;
-
-  const pbf = new PBF(/** @type {ArrayBuffer} */ (source));
-  const pbfLayers = pbf.readFields(layersPBFReader, {});
-  /** @type {Array.<module:ol/Feature|module:ol/render/Feature>} */
-  const features = [];
-  for (const name in pbfLayers) {
-    if (layers && layers.indexOf(name) == -1) {
-      continue;
-    }
-    const pbfLayer = pbfLayers[name];
-
-    for (let i = 0, ii = pbfLayer.length; i < ii; ++i) {
-      const rawFeature = readRawFeature(pbf, pbfLayer, i);
-      features.push(this.createFeature_(pbf, rawFeature));
-    }
-    this.extent_ = pbfLayer ? [0, 0, pbfLayer.extent, pbfLayer.extent] : null;
-  }
-
-  return features;
-};
-
-
-/**
- * @inheritDoc
- * @api
- */
-MVT.prototype.readProjection = function(source) {
-  return this.dataProjection;
-};
-
-
-/**
- * Sets the layers that features will be read from.
- * @param {Array.<string>} layers Layers.
- * @api
- */
-MVT.prototype.setLayers = function(layers) {
-  this.layers_ = layers;
-};
-
-
-/**
- * Not implemented.
- * @override
- */
-MVT.prototype.readFeature = function() {};
-
-
-/**
- * Not implemented.
- * @override
- */
-MVT.prototype.readGeometry = function() {};
-
-
-/**
- * Not implemented.
- * @override
- */
-MVT.prototype.writeFeature = function() {};
-
-
-/**
- * Not implemented.
- * @override
- */
-MVT.prototype.writeGeometry = function() {};
-
-
-/**
- * Not implemented.
- * @override
- */
-MVT.prototype.writeFeatures = function() {};
 export default MVT;

src/ol/format/OSMXML.js

@@ -2,7 +2,6 @@
  * @module ol/format/OSMXML
  */
 // FIXME add typedef for stack state objects
-import {inherits} from '../util.js';
 import {extend} from '../array.js';
 import Feature from '../Feature.js';
 import {transformWithOptions} from '../format/Feature.js';
@@ -15,26 +14,6 @@ import {isEmpty} from '../obj.js';
 import {get as getProjection} from '../proj.js';
 import {pushParseAndPop, makeStructureNS} from '../xml.js';
 
-/**
- * @classdesc
- * Feature format for reading data in the
- * [OSMXML format](http://wiki.openstreetmap.org/wiki/OSM_XML).
- *
- * @constructor
- * @extends {module:ol/format/XMLFeature}
- * @api
- */
-const OSMXML = function() {
-  XMLFeature.call(this);
-
-  /**
-   * @inheritDoc
-   */
-  this.dataProjection = getProjection('EPSG:4326');
-};
-
-inherits(OSMXML, XMLFeature);
-
 
 /**
  * @const
@@ -65,6 +44,83 @@ const PARSERS = makeStructureNS(
   });
 
 
+/**
+ * @classdesc
+ * Feature format for reading data in the
+ * [OSMXML format](http://wiki.openstreetmap.org/wiki/OSM_XML).
+ *
+ * @api
+ */
+class OSMXML extends XMLFeature {
+  constructor() {
+    super();
+
+    /**
+     * @inheritDoc
+     */
+    this.dataProjection = getProjection('EPSG:4326');
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeaturesFromNode(node, opt_options) {
+    const options = this.getReadOptions(node, opt_options);
+    if (node.localName == 'osm') {
+      const state = pushParseAndPop({
+        nodes: {},
+        ways: [],
+        features: []
+      }, PARSERS, node, [options]);
+      // parse nodes in ways
+      for (let j = 0; j < state.ways.length; j++) {
+        const values = /** @type {Object} */ (state.ways[j]);
+        /** @type {Array.<number>} */
+        const flatCoordinates = [];
+        for (let i = 0, ii = values.ndrefs.length; i < ii; i++) {
+          const point = state.nodes[values.ndrefs[i]];
+          extend(flatCoordinates, point);
+        }
+        let geometry;
+        if (values.ndrefs[0] == values.ndrefs[values.ndrefs.length - 1]) {
+          // closed way
+          geometry = new Polygon(flatCoordinates, GeometryLayout.XY, [flatCoordinates.length]);
+        } else {
+          geometry = new LineString(flatCoordinates, GeometryLayout.XY);
+        }
+        transformWithOptions(geometry, false, options);
+        const feature = new Feature(geometry);
+        feature.setId(values.id);
+        feature.setProperties(values.tags);
+        state.features.push(feature);
+      }
+      if (state.features) {
+        return state.features;
+      }
+    }
+    return [];
+  }
+
+  /**
+   * Not implemented.
+   * @inheritDoc
+   */
+  writeFeatureNode(feature, opt_options) {}
+
+  /**
+   * Not implemented.
+   * @inheritDoc
+   */
+  writeFeaturesNode(features, opt_options) {}
+
+  /**
+   * Not implemented.
+   * @inheritDoc
+   */
+  writeGeometryNode(geometry, opt_options) {}
+}
+
+
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
@@ -140,90 +196,4 @@ function readTag(node, objectStack) {
 }
 
 
-/**
- * Read all features from an OSM source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-OSMXML.prototype.readFeatures;
-
-
-/**
- * @inheritDoc
- */
-OSMXML.prototype.readFeaturesFromNode = function(node, opt_options) {
-  const options = this.getReadOptions(node, opt_options);
-  if (node.localName == 'osm') {
-    const state = pushParseAndPop({
-      nodes: {},
-      ways: [],
-      features: []
-    }, PARSERS, node, [options]);
-    // parse nodes in ways
-    for (let j = 0; j < state.ways.length; j++) {
-      const values = /** @type {Object} */ (state.ways[j]);
-      /** @type {Array.<number>} */
-      const flatCoordinates = [];
-      for (let i = 0, ii = values.ndrefs.length; i < ii; i++) {
-        const point = state.nodes[values.ndrefs[i]];
-        extend(flatCoordinates, point);
-      }
-      let geometry;
-      if (values.ndrefs[0] == values.ndrefs[values.ndrefs.length - 1]) {
-        // closed way
-        geometry = new Polygon(null);
-        geometry.setFlatCoordinates(GeometryLayout.XY, flatCoordinates,
-          [flatCoordinates.length]);
-      } else {
-        geometry = new LineString(null);
-        geometry.setFlatCoordinates(GeometryLayout.XY, flatCoordinates);
-      }
-      transformWithOptions(geometry, false, options);
-      const feature = new Feature(geometry);
-      feature.setId(values.id);
-      feature.setProperties(values.tags);
-      state.features.push(feature);
-    }
-    if (state.features) {
-      return state.features;
-    }
-  }
-  return [];
-};
-
-
-/**
- * Read the projection from an OSM source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @return {module:ol/proj/Projection} Projection.
- * @api
- */
-OSMXML.prototype.readProjection;
-
-
-/**
- * Not implemented.
- * @inheritDoc
- */
-OSMXML.prototype.writeFeatureNode = function(feature, opt_options) {};
-
-
-/**
- * Not implemented.
- * @inheritDoc
- */
-OSMXML.prototype.writeFeaturesNode = function(features, opt_options) {};
-
-
-/**
- * Not implemented.
- * @inheritDoc
- */
-OSMXML.prototype.writeGeometryNode = function(geometry, opt_options) {};
 export default OSMXML;

src/ol/format/OWS.js

@@ -1,22 +1,11 @@
 /**
  * @module ol/format/OWS
  */
-import {inherits} from '../util.js';
 import {readHref} from '../format/XLink.js';
 import XML from '../format/XML.js';
 import {readString} from '../format/xsd.js';
 import {makeObjectPropertyPusher, makeObjectPropertySetter, makeStructureNS, pushParseAndPop} from '../xml.js';
 
-/**
- * @constructor
- * @extends {module:ol/format/XML}
- */
-const OWS = function() {
-  XML.call(this);
-};
-
-inherits(OWS, XML);
-
 
 /**
  * @const
@@ -37,6 +26,34 @@ const PARSERS = makeStructureNS(
   });
 
 
+class OWS extends XML {
+  constructor() {
+    super();
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFromDocument(doc) {
+    for (let n = doc.firstChild; n; n = n.nextSibling) {
+      if (n.nodeType == Node.ELEMENT_NODE) {
+        return this.readFromNode(n);
+      }
+    }
+    return null;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFromNode(node) {
+    const owsObject = pushParseAndPop({},
+      PARSERS, node, []);
+    return owsObject ? owsObject : null;
+  }
+}
+
+
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
@@ -187,29 +204,6 @@ const SERVICE_PROVIDER_PARSERS =
       });
 
 
-/**
- * @inheritDoc
- */
-OWS.prototype.readFromDocument = function(doc) {
-  for (let n = doc.firstChild; n; n = n.nextSibling) {
-    if (n.nodeType == Node.ELEMENT_NODE) {
-      return this.readFromNode(n);
-    }
-  }
-  return null;
-};
-
-
-/**
- * @inheritDoc
- */
-OWS.prototype.readFromNode = function(node) {
-  const owsObject = pushParseAndPop({},
-    PARSERS, node, []);
-  return owsObject ? owsObject : null;
-};
-
-
 /**
  * @param {Node} node Node.
  * @param {Array.<*>} objectStack Object stack.

src/ol/format/Polyline.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/Polyline
  */
-import {inherits} from '../util.js';
 import {assert} from '../asserts.js';
 import Feature from '../Feature.js';
 import {transformWithOptions} from '../format/Feature.js';
@@ -27,16 +26,25 @@ import {get as getProjection} from '../proj.js';
  * Feature format for reading and writing data in the Encoded
  * Polyline Algorithm Format.
  *
- * @constructor
- * @extends {module:ol/format/TextFeature}
- * @param {module:ol/format/Polyline~Options=} opt_options Optional configuration object.
+ * When reading features, the coordinates are assumed to be in two dimensions
+ * and in [latitude, longitude] order.
+ *
+ * As Polyline sources contain a single feature,
+ * {@link module:ol/format/Polyline~Polyline#readFeatures} will return the
+ * feature in an array.
+ *
  * @api
  */
-const Polyline = function(opt_options) {
+class Polyline extends TextFeature {
+
+  /**
+   * @param {module:ol/format/Polyline~Options=} opt_options Optional configuration object.
+   */
+  constructor(opt_options) {
+    super();
 
     const options = opt_options ? opt_options : {};
 
-  TextFeature.call(this);
 
     /**
      * @inheritDoc
@@ -55,9 +63,74 @@ const Polyline = function(opt_options) {
      */
     this.geometryLayout_ = options.geometryLayout ?
       options.geometryLayout : GeometryLayout.XY;
-};
+  }
 
-inherits(Polyline, TextFeature);
+  /**
+   * @inheritDoc
+   */
+  readFeatureFromText(text, opt_options) {
+    const geometry = this.readGeometryFromText(text, opt_options);
+    return new Feature(geometry);
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeaturesFromText(text, opt_options) {
+    const feature = this.readFeatureFromText(text, opt_options);
+    return [feature];
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readGeometryFromText(text, opt_options) {
+    const stride = getStrideForLayout(this.geometryLayout_);
+    const flatCoordinates = decodeDeltas(text, stride, this.factor_);
+    flipXY(flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
+    const coordinates = inflateCoordinates(flatCoordinates, 0, flatCoordinates.length, stride);
+
+    return (
+      /** @type {module:ol/geom/Geometry} */ (transformWithOptions(
+        new LineString(coordinates, this.geometryLayout_),
+        false,
+        this.adaptOptions(opt_options)
+      ))
+    );
+  }
+
+  /**
+   * @inheritDoc
+   */
+  writeFeatureText(feature, opt_options) {
+    const geometry = feature.getGeometry();
+    if (geometry) {
+      return this.writeGeometryText(geometry, opt_options);
+    } else {
+      assert(false, 40); // Expected `feature` to have a geometry
+      return '';
+    }
+  }
+
+  /**
+   * @inheritDoc
+   */
+  writeFeaturesText(features, opt_options) {
+    return this.writeFeatureText(features[0], opt_options);
+  }
+
+  /**
+   * @inheritDoc
+   */
+  writeGeometryText(geometry, opt_options) {
+    geometry = /** @type {module:ol/geom/LineString} */
+      (transformWithOptions(geometry, true, this.adaptOptions(opt_options)));
+    const flatCoordinates = geometry.getFlatCoordinates();
+    const stride = geometry.getStride();
+    flipXY(flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
+    return encodeDeltas(flatCoordinates, stride, this.factor_);
+  }
+}
 
 
 /**
@@ -264,135 +337,4 @@ export function encodeUnsignedInteger(num) {
 }
 
 
-/**
- * Read the feature from the Polyline source. The coordinates are assumed to be
- * in two dimensions and in latitude, longitude order.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/Feature} Feature.
- * @api
- */
-Polyline.prototype.readFeature;
-
-
-/**
- * @inheritDoc
- */
-Polyline.prototype.readFeatureFromText = function(text, opt_options) {
-  const geometry = this.readGeometryFromText(text, opt_options);
-  return new Feature(geometry);
-};
-
-
-/**
- * Read the feature from the source. As Polyline sources contain a single
- * feature, this will return the feature in an array.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-Polyline.prototype.readFeatures;
-
-
-/**
- * @inheritDoc
- */
-Polyline.prototype.readFeaturesFromText = function(text, opt_options) {
-  const feature = this.readFeatureFromText(text, opt_options);
-  return [feature];
-};
-
-
-/**
- * Read the geometry from the source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/geom/Geometry} Geometry.
- * @api
- */
-Polyline.prototype.readGeometry;
-
-
-/**
- * @inheritDoc
- */
-Polyline.prototype.readGeometryFromText = function(text, opt_options) {
-  const stride = getStrideForLayout(this.geometryLayout_);
-  const flatCoordinates = decodeDeltas(text, stride, this.factor_);
-  flipXY(flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
-  const coordinates = inflateCoordinates(flatCoordinates, 0, flatCoordinates.length, stride);
-
-  return (
-    /** @type {module:ol/geom/Geometry} */ (transformWithOptions(
-      new LineString(coordinates, this.geometryLayout_),
-      false,
-      this.adaptOptions(opt_options)
-    ))
-  );
-};
-
-
-/**
- * Read the projection from a Polyline source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @return {module:ol/proj/Projection} Projection.
- * @api
- */
-Polyline.prototype.readProjection;
-
-
-/**
- * @inheritDoc
- */
-Polyline.prototype.writeFeatureText = function(feature, opt_options) {
-  const geometry = feature.getGeometry();
-  if (geometry) {
-    return this.writeGeometryText(geometry, opt_options);
-  } else {
-    assert(false, 40); // Expected `feature` to have a geometry
-    return '';
-  }
-};
-
-
-/**
- * @inheritDoc
- */
-Polyline.prototype.writeFeaturesText = function(features, opt_options) {
-  return this.writeFeatureText(features[0], opt_options);
-};
-
-
-/**
- * Write a single geometry in Polyline format.
- *
- * @function
- * @param {module:ol/geom/Geometry} geometry Geometry.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} Geometry.
- * @api
- */
-Polyline.prototype.writeGeometry;
-
-
-/**
- * @inheritDoc
- */
-Polyline.prototype.writeGeometryText = function(geometry, opt_options) {
-  geometry = /** @type {module:ol/geom/LineString} */
-    (transformWithOptions(geometry, true, this.adaptOptions(opt_options)));
-  const flatCoordinates = geometry.getFlatCoordinates();
-  const stride = geometry.getStride();
-  flipXY(flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
-  return encodeDeltas(flatCoordinates, stride, this.factor_);
-};
 export default Polyline;

src/ol/format/TextFeature.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/TextFeature
  */
-import {inherits} from '../util.js';
 import FeatureFormat from '../format/Feature.js';
 import FormatType from '../format/FormatType.js';
 
@@ -11,15 +10,169 @@ import FormatType from '../format/FormatType.js';
  * instantiated in apps.
  * Base class for text feature formats.
  *
- * @constructor
  * @abstract
- * @extends {module:ol/format/Feature}
  */
-const TextFeature = function() {
-  FeatureFormat.call(this);
-};
+class TextFeature extends FeatureFormat {
+  constructor() {
+    super();
+  }
 
-inherits(TextFeature, FeatureFormat);
+  /**
+   * @inheritDoc
+   */
+  getType() {
+    return FormatType.TEXT;
+  }
+
+  /**
+   * Read the feature from the source.
+   *
+   * @param {Document|Node|Object|string} source Source.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @return {module:ol/Feature} Feature.
+   * @api
+   */
+  readFeature(source, opt_options) {
+    return this.readFeatureFromText(getText(source), this.adaptOptions(opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {string} text Text.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @protected
+   * @return {module:ol/Feature} Feature.
+   */
+  readFeatureFromText(text, opt_options) {}
+
+  /**
+   * Read the features from the source.
+   *
+   * @param {Document|Node|Object|string} source Source.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @return {Array.<module:ol/Feature>} Features.
+   * @api
+   */
+  readFeatures(source, opt_options) {
+    return this.readFeaturesFromText(getText(source), this.adaptOptions(opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {string} text Text.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @protected
+   * @return {Array.<module:ol/Feature>} Features.
+   */
+  readFeaturesFromText(text, opt_options) {}
+
+  /**
+   * Read the geometry from the source.
+   *
+   * @param {Document|Node|Object|string} source Source.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @return {module:ol/geom/Geometry} Geometry.
+   * @api
+   */
+  readGeometry(source, opt_options) {
+    return this.readGeometryFromText(getText(source), this.adaptOptions(opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {string} text Text.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @protected
+   * @return {module:ol/geom/Geometry} Geometry.
+   */
+  readGeometryFromText(text, opt_options) {}
+
+  /**
+   * Read the projection from the source.
+   *
+   * @function
+   * @param {Document|Node|Object|string} source Source.
+   * @return {module:ol/proj/Projection} Projection.
+   * @api
+   */
+  readProjection(source) {
+    return this.readProjectionFromText(getText(source));
+  }
+
+  /**
+   * @param {string} text Text.
+   * @protected
+   * @return {module:ol/proj/Projection} Projection.
+   */
+  readProjectionFromText(text) {
+    return this.dataProjection;
+  }
+
+  /**
+   * Encode a feature as a string.
+   *
+   * @function
+   * @param {module:ol/Feature} feature Feature.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {string} Encoded feature.
+   * @api
+   */
+  writeFeature(feature, opt_options) {
+    return this.writeFeatureText(feature, this.adaptOptions(opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {module:ol/Feature} feature Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @protected
+   * @return {string} Text.
+   */
+  writeFeatureText(feature, opt_options) {}
+
+  /**
+   * Encode an array of features as string.
+   *
+   * @param {Array.<module:ol/Feature>} features Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {string} Encoded features.
+   * @api
+   */
+  writeFeatures(features, opt_options) {
+    return this.writeFeaturesText(features, this.adaptOptions(opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {Array.<module:ol/Feature>} features Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @protected
+   * @return {string} Text.
+   */
+  writeFeaturesText(features, opt_options) {}
+
+  /**
+   * Write a single geometry.
+   *
+   * @function
+   * @param {module:ol/geom/Geometry} geometry Geometry.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {string} Geometry.
+   * @api
+   */
+  writeGeometry(geometry, opt_options) {
+    return this.writeGeometryText(geometry, this.adaptOptions(opt_options));
+  }
+
+  /**
+   * @abstract
+   * @param {module:ol/geom/Geometry} geometry Geometry.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @protected
+   * @return {string} Text.
+   */
+  writeGeometryText(geometry, opt_options) {}
+}
 
 
 /**
@@ -35,136 +188,4 @@ function getText(source) {
 }
 
 
-/**
- * @inheritDoc
- */
-TextFeature.prototype.getType = function() {
-  return FormatType.TEXT;
-};
-
-
-/**
- * @inheritDoc
- */
-TextFeature.prototype.readFeature = function(source, opt_options) {
-  return this.readFeatureFromText(getText(source), this.adaptOptions(opt_options));
-};
-
-
-/**
- * @abstract
- * @param {string} text Text.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @protected
- * @return {module:ol/Feature} Feature.
- */
-TextFeature.prototype.readFeatureFromText = function(text, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-TextFeature.prototype.readFeatures = function(source, opt_options) {
-  return this.readFeaturesFromText(getText(source), this.adaptOptions(opt_options));
-};
-
-
-/**
- * @abstract
- * @param {string} text Text.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @protected
- * @return {Array.<module:ol/Feature>} Features.
- */
-TextFeature.prototype.readFeaturesFromText = function(text, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-TextFeature.prototype.readGeometry = function(source, opt_options) {
-  return this.readGeometryFromText(getText(source), this.adaptOptions(opt_options));
-};
-
-
-/**
- * @abstract
- * @param {string} text Text.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @protected
- * @return {module:ol/geom/Geometry} Geometry.
- */
-TextFeature.prototype.readGeometryFromText = function(text, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-TextFeature.prototype.readProjection = function(source) {
-  return this.readProjectionFromText(getText(source));
-};
-
-
-/**
- * @param {string} text Text.
- * @protected
- * @return {module:ol/proj/Projection} Projection.
- */
-TextFeature.prototype.readProjectionFromText = function(text) {
-  return this.dataProjection;
-};
-
-
-/**
- * @inheritDoc
- */
-TextFeature.prototype.writeFeature = function(feature, opt_options) {
-  return this.writeFeatureText(feature, this.adaptOptions(opt_options));
-};
-
-
-/**
- * @abstract
- * @param {module:ol/Feature} feature Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @protected
- * @return {string} Text.
- */
-TextFeature.prototype.writeFeatureText = function(feature, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-TextFeature.prototype.writeFeatures = function(features, opt_options) {
-  return this.writeFeaturesText(features, this.adaptOptions(opt_options));
-};
-
-
-/**
- * @abstract
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @protected
- * @return {string} Text.
- */
-TextFeature.prototype.writeFeaturesText = function(features, opt_options) {};
-
-
-/**
- * @inheritDoc
- */
-TextFeature.prototype.writeGeometry = function(geometry, opt_options) {
-  return this.writeGeometryText(geometry, this.adaptOptions(opt_options));
-};
-
-
-/**
- * @abstract
- * @param {module:ol/geom/Geometry} geometry Geometry.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @protected
- * @return {string} Text.
- */
-TextFeature.prototype.writeGeometryText = function(geometry, opt_options) {};
 export default TextFeature;

src/ol/format/TopoJSON.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/TopoJSON
  */
-import {inherits} from '../util.js';
 import Feature from '../Feature.js';
 import {transformWithOptions} from '../format/Feature.js';
 import JSONFeature from '../format/JSONFeature.js';
@@ -43,17 +42,18 @@ import {get as getProjection} from '../proj.js';
  * @classdesc
  * Feature format for reading data in the TopoJSON format.
  *
- * @constructor
- * @extends {module:ol/format/JSONFeature}
- * @param {module:ol/format/TopoJSON~Options=} opt_options Options.
  * @api
  */
-const TopoJSON = function(opt_options) {
+class TopoJSON extends JSONFeature {
+
+  /**
+   * @param {module:ol/format/TopoJSON~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
+    super();
 
     const options = opt_options ? opt_options : {};
 
-  JSONFeature.call(this);
-
     /**
      * @private
      * @type {string|undefined}
@@ -73,9 +73,86 @@ const TopoJSON = function(opt_options) {
       options.dataProjection ?
         options.dataProjection : 'EPSG:4326');
 
-};
+  }
 
-inherits(TopoJSON, JSONFeature);
+  /**
+   * @inheritDoc
+   */
+  readFeaturesFromObject(object, opt_options) {
+    if (object.type == 'Topology') {
+      const topoJSONTopology = /** @type {TopoJSONTopology} */ (object);
+      let transform, scale = null, translate = null;
+      if (topoJSONTopology.transform) {
+        transform = topoJSONTopology.transform;
+        scale = transform.scale;
+        translate = transform.translate;
+      }
+      const arcs = topoJSONTopology.arcs;
+      if (transform) {
+        transformArcs(arcs, scale, translate);
+      }
+      /** @type {Array.<module:ol/Feature>} */
+      const features = [];
+      const topoJSONFeatures = topoJSONTopology.objects;
+      const property = this.layerName_;
+      let feature;
+      for (const objectName in topoJSONFeatures) {
+        if (this.layers_ && this.layers_.indexOf(objectName) == -1) {
+          continue;
+        }
+        if (topoJSONFeatures[objectName].type === 'GeometryCollection') {
+          feature = /** @type {TopoJSONGeometryCollection} */ (topoJSONFeatures[objectName]);
+          features.push.apply(features, readFeaturesFromGeometryCollection(
+            feature, arcs, scale, translate, property, objectName, opt_options));
+        } else {
+          feature = /** @type {TopoJSONGeometry} */ (topoJSONFeatures[objectName]);
+          features.push(readFeatureFromGeometry(
+            feature, arcs, scale, translate, property, objectName, opt_options));
+        }
+      }
+      return features;
+    } else {
+      return [];
+    }
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readProjectionFromObject(object) {
+    return this.dataProjection;
+  }
+
+  /**
+   * Not implemented.
+   * @inheritDoc
+   */
+  writeFeatureObject(feature, opt_options) {}
+
+  /**
+   * Not implemented.
+   * @inheritDoc
+   */
+  writeFeaturesObject(features, opt_options) {}
+
+  /**
+   * Not implemented.
+   * @inheritDoc
+   */
+  writeGeometryObject(geometry, opt_options) {}
+
+  /**
+   * Not implemented.
+   * @override
+   */
+  readGeometryFromObject() {}
+
+  /**
+   * Not implemented.
+   * @override
+   */
+  readFeatureFromObject() {}
+}
 
 
 /**
@@ -298,59 +375,6 @@ function readFeatureFromGeometry(object, arcs, scale, translate, property, name,
 }
 
 
-/**
- * Read all features from a TopoJSON source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-TopoJSON.prototype.readFeatures;
-
-
-/**
- * @inheritDoc
- */
-TopoJSON.prototype.readFeaturesFromObject = function(object, opt_options) {
-  if (object.type == 'Topology') {
-    const topoJSONTopology = /** @type {TopoJSONTopology} */ (object);
-    let transform, scale = null, translate = null;
-    if (topoJSONTopology.transform) {
-      transform = topoJSONTopology.transform;
-      scale = transform.scale;
-      translate = transform.translate;
-    }
-    const arcs = topoJSONTopology.arcs;
-    if (transform) {
-      transformArcs(arcs, scale, translate);
-    }
-    /** @type {Array.<module:ol/Feature>} */
-    const features = [];
-    const topoJSONFeatures = topoJSONTopology.objects;
-    const property = this.layerName_;
-    let feature;
-    for (const objectName in topoJSONFeatures) {
-      if (this.layers_ && this.layers_.indexOf(objectName) == -1) {
-        continue;
-      }
-      if (topoJSONFeatures[objectName].type === 'GeometryCollection') {
-        feature = /** @type {TopoJSONGeometryCollection} */ (topoJSONFeatures[objectName]);
-        features.push.apply(features, readFeaturesFromGeometryCollection(
-          feature, arcs, scale, translate, property, objectName, opt_options));
-      } else {
-        feature = /** @type {TopoJSONGeometry} */ (topoJSONFeatures[objectName]);
-        features.push(readFeatureFromGeometry(
-          feature, arcs, scale, translate, property, objectName, opt_options));
-      }
-    }
-    return features;
-  } else {
-    return [];
-  }
-};
-
-
 /**
  * Apply a linear transform to array of arcs.  The provided array of arcs is
  * modified in place.
@@ -401,56 +425,4 @@ function transformVertex(vertex, scale, translate) {
 }
 
 
-/**
- * Read the projection from a TopoJSON source.
- *
- * @param {Document|Node|Object|string} object Source.
- * @return {module:ol/proj/Projection} Projection.
- * @override
- * @api
- */
-TopoJSON.prototype.readProjection;
-
-
-/**
- * @inheritDoc
- */
-TopoJSON.prototype.readProjectionFromObject = function(object) {
-  return this.dataProjection;
-};
-
-
-/**
- * Not implemented.
- * @inheritDoc
- */
-TopoJSON.prototype.writeFeatureObject = function(feature, opt_options) {};
-
-
-/**
- * Not implemented.
- * @inheritDoc
- */
-TopoJSON.prototype.writeFeaturesObject = function(features, opt_options) {};
-
-
-/**
- * Not implemented.
- * @inheritDoc
- */
-TopoJSON.prototype.writeGeometryObject = function(geometry, opt_options) {};
-
-
-/**
- * Not implemented.
- * @override
- */
-TopoJSON.prototype.readGeometryFromObject = function() {};
-
-
-/**
- * Not implemented.
- * @override
- */
-TopoJSON.prototype.readFeatureFromObject = function() {};
 export default TopoJSON;

src/ol/format/WFS.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/WFS
  */
-import {inherits} from '../util.js';
 import {assert} from '../asserts.js';
 import GML2 from '../format/GML2.js';
 import GML3 from '../format/GML3.js';
@@ -17,6 +16,69 @@ import {createElementNS, isDocument, isNode, makeArrayPusher, makeChildAppender,
   pushParseAndPop, pushSerializeAndPop, XML_SCHEMA_INSTANCE_URI} from '../xml.js';
 
 
+/**
+ * @const
+ * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
+ */
+const FEATURE_COLLECTION_PARSERS = {
+  'http://www.opengis.net/gml': {
+    'boundedBy': makeObjectPropertySetter(
+      GMLBase.prototype.readGeometryElement, 'bounds')
+  }
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
+ */
+const TRANSACTION_SUMMARY_PARSERS = {
+  'http://www.opengis.net/wfs': {
+    'totalInserted': makeObjectPropertySetter(readNonNegativeInteger),
+    'totalUpdated': makeObjectPropertySetter(readNonNegativeInteger),
+    'totalDeleted': makeObjectPropertySetter(readNonNegativeInteger)
+  }
+};
+
+
+/**
+ * @const
+ * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
+ */
+const TRANSACTION_RESPONSE_PARSERS = {
+  'http://www.opengis.net/wfs': {
+    'TransactionSummary': makeObjectPropertySetter(
+      readTransactionSummary, 'transactionSummary'),
+    'InsertResults': makeObjectPropertySetter(
+      readInsertResults, 'insertIds')
+  }
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
+ */
+const QUERY_SERIALIZERS = {
+  'http://www.opengis.net/wfs': {
+    'PropertyName': makeChildAppender(writeStringTextNode)
+  }
+};
+
+
+/**
+ * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
+ */
+const TRANSACTION_SERIALIZERS = {
+  'http://www.opengis.net/wfs': {
+    'Insert': makeChildAppender(writeFeature),
+    'Update': makeChildAppender(writeUpdate),
+    'Delete': makeChildAppender(writeDelete),
+    'Property': makeChildAppender(writeProperty),
+    'Native': makeChildAppender(writeNative)
+  }
+};
+
+
 /**
  * @typedef {Object} Options
  * @property {Object.<string, string>|string} [featureNS] The namespace URI used for features.
@@ -138,12 +200,16 @@ const DEFAULT_VERSION = '1.1.0';
  * as option if you want to read a WFS that contains GML2 (WFS 1.0.0).
  * Also see {@link module:ol/format/GMLBase~GMLBase} which is used by this format.
  *
- * @constructor
- * @param {module:ol/format/WFS~Options=} opt_options Optional configuration object.
- * @extends {module:ol/format/XMLFeature}
  * @api
  */
-const WFS = function(opt_options) {
+class WFS extends XMLFeature {
+
+  /**
+   * @param {module:ol/format/WFS~Options=} opt_options Optional configuration object.
+   */
+  constructor(opt_options) {
+    super();
+
     const options = opt_options ? opt_options : {};
 
     /**
@@ -171,45 +237,26 @@ const WFS = function(opt_options) {
      */
     this.schemaLocation_ = options.schemaLocation ?
       options.schemaLocation : SCHEMA_LOCATIONS[DEFAULT_VERSION];
+  }
 
-  XMLFeature.call(this);
-};
-
-inherits(WFS, XMLFeature);
-
-
-/**
+  /**
    * @return {Array.<string>|string|undefined} featureType
    */
-WFS.prototype.getFeatureType = function() {
+  getFeatureType() {
     return this.featureType_;
-};
+  }
 
-
-/**
+  /**
    * @param {Array.<string>|string|undefined} featureType Feature type(s) to parse.
    */
-WFS.prototype.setFeatureType = function(featureType) {
+  setFeatureType(featureType) {
     this.featureType_ = featureType;
-};
+  }
 
-
-/**
- * Read all features from a WFS FeatureCollection.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-WFS.prototype.readFeatures;
-
-
-/**
+  /**
    * @inheritDoc
    */
-WFS.prototype.readFeaturesFromNode = function(node, opt_options) {
+  readFeaturesFromNode(node, opt_options) {
     const context = /** @type {module:ol/xml~NodeStackItem} */ ({
       'featureType': this.featureType_,
       'featureNS': this.featureNS_
@@ -226,17 +273,16 @@ WFS.prototype.readFeaturesFromNode = function(node, opt_options) {
       features = [];
     }
     return features;
-};
+  }
 
-
-/**
+  /**
    * Read transaction response of the source.
    *
    * @param {Document|Node|Object|string} source Source.
    * @return {module:ol/format/WFS~TransactionResponse|undefined} Transaction response.
    * @api
    */
-WFS.prototype.readTransactionResponse = function(source) {
+  readTransactionResponse(source) {
     if (isDocument(source)) {
       return this.readTransactionResponseFromDocument(
         /** @type {Document} */ (source));
@@ -248,10 +294,9 @@ WFS.prototype.readTransactionResponse = function(source) {
     } else {
       return undefined;
     }
-};
+  }
 
-
-/**
+  /**
    * Read feature collection metadata of the source.
    *
    * @param {Document|Node|Object|string} source Source.
@@ -259,7 +304,7 @@ WFS.prototype.readTransactionResponse = function(source) {
    *     FeatureCollection metadata.
    * @api
    */
-WFS.prototype.readFeatureCollectionMetadata = function(source) {
+  readFeatureCollectionMetadata(source) {
     if (isDocument(source)) {
       return this.readFeatureCollectionMetadataFromDocument(
         /** @type {Document} */ (source));
@@ -272,42 +317,28 @@ WFS.prototype.readFeatureCollectionMetadata = function(source) {
     } else {
       return undefined;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Document} doc Document.
    * @return {module:ol/format/WFS~FeatureCollectionMetadata|undefined}
    *     FeatureCollection metadata.
    */
-WFS.prototype.readFeatureCollectionMetadataFromDocument = function(doc) {
+  readFeatureCollectionMetadataFromDocument(doc) {
     for (let n = doc.firstChild; n; n = n.nextSibling) {
       if (n.nodeType == Node.ELEMENT_NODE) {
         return this.readFeatureCollectionMetadataFromNode(n);
       }
     }
     return undefined;
-};
-
-
-/**
- * @const
- * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
- */
-const FEATURE_COLLECTION_PARSERS = {
-  'http://www.opengis.net/gml': {
-    'boundedBy': makeObjectPropertySetter(
-      GMLBase.prototype.readGeometryElement, 'bounds')
   }
-};
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @return {module:ol/format/WFS~FeatureCollectionMetadata|undefined}
    *     FeatureCollection metadata.
    */
-WFS.prototype.readFeatureCollectionMetadataFromNode = function(node) {
+  readFeatureCollectionMetadataFromNode(node) {
     const result = {};
     const value = readNonNegativeIntegerString(
       node.getAttribute('numberOfFeatures'));
@@ -315,20 +346,194 @@ WFS.prototype.readFeatureCollectionMetadataFromNode = function(node) {
     return pushParseAndPop(
       /** @type {module:ol/format/WFS~FeatureCollectionMetadata} */ (result),
       FEATURE_COLLECTION_PARSERS, node, [], this.gmlFormat_);
-};
-
-
-/**
- * @const
- * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
- */
-const TRANSACTION_SUMMARY_PARSERS = {
-  'http://www.opengis.net/wfs': {
-    'totalInserted': makeObjectPropertySetter(readNonNegativeInteger),
-    'totalUpdated': makeObjectPropertySetter(readNonNegativeInteger),
-    'totalDeleted': makeObjectPropertySetter(readNonNegativeInteger)
   }
-};
+
+  /**
+   * @param {Document} doc Document.
+   * @return {module:ol/format/WFS~TransactionResponse|undefined} Transaction response.
+   */
+  readTransactionResponseFromDocument(doc) {
+    for (let n = doc.firstChild; n; n = n.nextSibling) {
+      if (n.nodeType == Node.ELEMENT_NODE) {
+        return this.readTransactionResponseFromNode(n);
+      }
+    }
+    return undefined;
+  }
+
+  /**
+   * @param {Node} node Node.
+   * @return {module:ol/format/WFS~TransactionResponse|undefined} Transaction response.
+   */
+  readTransactionResponseFromNode(node) {
+    return pushParseAndPop(
+      /** @type {module:ol/format/WFS~TransactionResponse} */({}),
+      TRANSACTION_RESPONSE_PARSERS, node, []);
+  }
+
+  /**
+   * Encode format as WFS `GetFeature` and return the Node.
+   *
+   * @param {module:ol/format/WFS~WriteGetFeatureOptions} options Options.
+   * @return {Node} Result.
+   * @api
+   */
+  writeGetFeature(options) {
+    const node = createElementNS(WFSNS, 'GetFeature');
+    node.setAttribute('service', 'WFS');
+    node.setAttribute('version', '1.1.0');
+    let filter;
+    if (options) {
+      if (options.handle) {
+        node.setAttribute('handle', options.handle);
+      }
+      if (options.outputFormat) {
+        node.setAttribute('outputFormat', options.outputFormat);
+      }
+      if (options.maxFeatures !== undefined) {
+        node.setAttribute('maxFeatures', options.maxFeatures);
+      }
+      if (options.resultType) {
+        node.setAttribute('resultType', options.resultType);
+      }
+      if (options.startIndex !== undefined) {
+        node.setAttribute('startIndex', options.startIndex);
+      }
+      if (options.count !== undefined) {
+        node.setAttribute('count', options.count);
+      }
+      filter = options.filter;
+      if (options.bbox) {
+        assert(options.geometryName,
+          12); // `options.geometryName` must also be provided when `options.bbox` is set
+        const bbox = bboxFilter(
+          /** @type {string} */ (options.geometryName), options.bbox, options.srsName);
+        if (filter) {
+          // if bbox and filter are both set, combine the two into a single filter
+          filter = andFilter(filter, bbox);
+        } else {
+          filter = bbox;
+        }
+      }
+    }
+    node.setAttributeNS(XML_SCHEMA_INSTANCE_URI, 'xsi:schemaLocation', this.schemaLocation_);
+    /** @type {module:ol/xml~NodeStackItem} */
+    const context = {
+      node: node,
+      'srsName': options.srsName,
+      'featureNS': options.featureNS ? options.featureNS : this.featureNS_,
+      'featurePrefix': options.featurePrefix,
+      'geometryName': options.geometryName,
+      'filter': filter,
+      'propertyNames': options.propertyNames ? options.propertyNames : []
+    };
+    assert(Array.isArray(options.featureTypes),
+      11); // `options.featureTypes` should be an Array
+    writeGetFeature(node, /** @type {!Array.<string>} */ (options.featureTypes), [context]);
+    return node;
+  }
+
+  /**
+   * Encode format as WFS `Transaction` and return the Node.
+   *
+   * @param {Array.<module:ol/Feature>} inserts The features to insert.
+   * @param {Array.<module:ol/Feature>} updates The features to update.
+   * @param {Array.<module:ol/Feature>} deletes The features to delete.
+   * @param {module:ol/format/WFS~WriteTransactionOptions} options Write options.
+   * @return {Node} Result.
+   * @api
+   */
+  writeTransaction(inserts, updates, deletes, options) {
+    const objectStack = [];
+    const node = createElementNS(WFSNS, 'Transaction');
+    const version = options.version ? options.version : DEFAULT_VERSION;
+    const gmlVersion = version === '1.0.0' ? 2 : 3;
+    node.setAttribute('service', 'WFS');
+    node.setAttribute('version', version);
+    let baseObj;
+    /** @type {module:ol/xml~NodeStackItem} */
+    let obj;
+    if (options) {
+      baseObj = options.gmlOptions ? options.gmlOptions : {};
+      if (options.handle) {
+        node.setAttribute('handle', options.handle);
+      }
+    }
+    const schemaLocation = SCHEMA_LOCATIONS[version];
+    node.setAttributeNS(XML_SCHEMA_INSTANCE_URI, 'xsi:schemaLocation', schemaLocation);
+    const featurePrefix = options.featurePrefix ? options.featurePrefix : FEATURE_PREFIX;
+    if (inserts) {
+      obj = {node: node, 'featureNS': options.featureNS,
+        'featureType': options.featureType, 'featurePrefix': featurePrefix,
+        'gmlVersion': gmlVersion, 'hasZ': options.hasZ, 'srsName': options.srsName};
+      assign(obj, baseObj);
+      pushSerializeAndPop(obj,
+        TRANSACTION_SERIALIZERS,
+        makeSimpleNodeFactory('Insert'), inserts,
+        objectStack);
+    }
+    if (updates) {
+      obj = {node: node, 'featureNS': options.featureNS,
+        'featureType': options.featureType, 'featurePrefix': featurePrefix,
+        'gmlVersion': gmlVersion, 'hasZ': options.hasZ, 'srsName': options.srsName};
+      assign(obj, baseObj);
+      pushSerializeAndPop(obj,
+        TRANSACTION_SERIALIZERS,
+        makeSimpleNodeFactory('Update'), updates,
+        objectStack);
+    }
+    if (deletes) {
+      pushSerializeAndPop({node: node, 'featureNS': options.featureNS,
+        'featureType': options.featureType, 'featurePrefix': featurePrefix,
+        'gmlVersion': gmlVersion, 'srsName': options.srsName},
+      TRANSACTION_SERIALIZERS,
+      makeSimpleNodeFactory('Delete'), deletes,
+      objectStack);
+    }
+    if (options.nativeElements) {
+      pushSerializeAndPop({node: node, 'featureNS': options.featureNS,
+        'featureType': options.featureType, 'featurePrefix': featurePrefix,
+        'gmlVersion': gmlVersion, 'srsName': options.srsName},
+      TRANSACTION_SERIALIZERS,
+      makeSimpleNodeFactory('Native'), options.nativeElements,
+      objectStack);
+    }
+    return node;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readProjectionFromDocument(doc) {
+    for (let n = doc.firstChild; n; n = n.nextSibling) {
+      if (n.nodeType == Node.ELEMENT_NODE) {
+        return this.readProjectionFromNode(n);
+      }
+    }
+    return null;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readProjectionFromNode(node) {
+    if (node.firstElementChild &&
+        node.firstElementChild.firstElementChild) {
+      node = node.firstElementChild.firstElementChild;
+      for (let n = node.firstElementChild; n; n = n.nextElementSibling) {
+        if (!(n.childNodes.length === 0 ||
+            (n.childNodes.length === 1 &&
+            n.firstChild.nodeType === 3))) {
+          const objectStack = [{}];
+          this.gmlFormat_.readGeometryElement(n, objectStack);
+          return getProjection(objectStack.pop().srsName);
+        }
+      }
+    }
+
+    return null;
+  }
+}
 
 
 /**
@@ -386,55 +591,6 @@ function readInsertResults(node, objectStack) {
 }
 
 
-/**
- * @const
- * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
- */
-const TRANSACTION_RESPONSE_PARSERS = {
-  'http://www.opengis.net/wfs': {
-    'TransactionSummary': makeObjectPropertySetter(
-      readTransactionSummary, 'transactionSummary'),
-    'InsertResults': makeObjectPropertySetter(
-      readInsertResults, 'insertIds')
-  }
-};
-
-
-/**
- * @param {Document} doc Document.
- * @return {module:ol/format/WFS~TransactionResponse|undefined} Transaction response.
- */
-WFS.prototype.readTransactionResponseFromDocument = function(doc) {
-  for (let n = doc.firstChild; n; n = n.nextSibling) {
-    if (n.nodeType == Node.ELEMENT_NODE) {
-      return this.readTransactionResponseFromNode(n);
-    }
-  }
-  return undefined;
-};
-
-
-/**
- * @param {Node} node Node.
- * @return {module:ol/format/WFS~TransactionResponse|undefined} Transaction response.
- */
-WFS.prototype.readTransactionResponseFromNode = function(node) {
-  return pushParseAndPop(
-    /** @type {module:ol/format/WFS~TransactionResponse} */({}),
-    TRANSACTION_RESPONSE_PARSERS, node, []);
-};
-
-
-/**
- * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
- */
-const QUERY_SERIALIZERS = {
-  'http://www.opengis.net/wfs': {
-    'PropertyName': makeChildAppender(writeStringTextNode)
-  }
-};
-
-
 /**
  * @param {Node} node Node.
  * @param {module:ol/Feature} feature Feature.
@@ -507,20 +663,6 @@ function writeDelete(node, feature, objectStack) {
 }
 
 
-/**
- * @type {Object.<string, Object.<string, module:ol/xml~Serializer>>}
- */
-const TRANSACTION_SERIALIZERS = {
-  'http://www.opengis.net/wfs': {
-    'Insert': makeChildAppender(writeFeature),
-    'Update': makeChildAppender(writeUpdate),
-    'Delete': makeChildAppender(writeDelete),
-    'Property': makeChildAppender(writeProperty),
-    'Native': makeChildAppender(writeNative)
-  }
-};
-
-
 /**
  * @param {Node} node Node.
  * @param {module:ol/Feature} feature Feature.
@@ -942,180 +1084,4 @@ function writeGetFeature(node, featureTypes, objectStack) {
 }
 
 
-/**
- * Encode format as WFS `GetFeature` and return the Node.
- *
- * @param {module:ol/format/WFS~WriteGetFeatureOptions} options Options.
- * @return {Node} Result.
- * @api
- */
-WFS.prototype.writeGetFeature = function(options) {
-  const node = createElementNS(WFSNS, 'GetFeature');
-  node.setAttribute('service', 'WFS');
-  node.setAttribute('version', '1.1.0');
-  let filter;
-  if (options) {
-    if (options.handle) {
-      node.setAttribute('handle', options.handle);
-    }
-    if (options.outputFormat) {
-      node.setAttribute('outputFormat', options.outputFormat);
-    }
-    if (options.maxFeatures !== undefined) {
-      node.setAttribute('maxFeatures', options.maxFeatures);
-    }
-    if (options.resultType) {
-      node.setAttribute('resultType', options.resultType);
-    }
-    if (options.startIndex !== undefined) {
-      node.setAttribute('startIndex', options.startIndex);
-    }
-    if (options.count !== undefined) {
-      node.setAttribute('count', options.count);
-    }
-    filter = options.filter;
-    if (options.bbox) {
-      assert(options.geometryName,
-        12); // `options.geometryName` must also be provided when `options.bbox` is set
-      const bbox = bboxFilter(
-        /** @type {string} */ (options.geometryName), options.bbox, options.srsName);
-      if (filter) {
-        // if bbox and filter are both set, combine the two into a single filter
-        filter = andFilter(filter, bbox);
-      } else {
-        filter = bbox;
-      }
-    }
-  }
-  node.setAttributeNS(XML_SCHEMA_INSTANCE_URI, 'xsi:schemaLocation', this.schemaLocation_);
-  /** @type {module:ol/xml~NodeStackItem} */
-  const context = {
-    node: node,
-    'srsName': options.srsName,
-    'featureNS': options.featureNS ? options.featureNS : this.featureNS_,
-    'featurePrefix': options.featurePrefix,
-    'geometryName': options.geometryName,
-    'filter': filter,
-    'propertyNames': options.propertyNames ? options.propertyNames : []
-  };
-  assert(Array.isArray(options.featureTypes),
-    11); // `options.featureTypes` should be an Array
-  writeGetFeature(node, /** @type {!Array.<string>} */ (options.featureTypes), [context]);
-  return node;
-};
-
-
-/**
- * Encode format as WFS `Transaction` and return the Node.
- *
- * @param {Array.<module:ol/Feature>} inserts The features to insert.
- * @param {Array.<module:ol/Feature>} updates The features to update.
- * @param {Array.<module:ol/Feature>} deletes The features to delete.
- * @param {module:ol/format/WFS~WriteTransactionOptions} options Write options.
- * @return {Node} Result.
- * @api
- */
-WFS.prototype.writeTransaction = function(inserts, updates, deletes, options) {
-  const objectStack = [];
-  const node = createElementNS(WFSNS, 'Transaction');
-  const version = options.version ? options.version : DEFAULT_VERSION;
-  const gmlVersion = version === '1.0.0' ? 2 : 3;
-  node.setAttribute('service', 'WFS');
-  node.setAttribute('version', version);
-  let baseObj;
-  /** @type {module:ol/xml~NodeStackItem} */
-  let obj;
-  if (options) {
-    baseObj = options.gmlOptions ? options.gmlOptions : {};
-    if (options.handle) {
-      node.setAttribute('handle', options.handle);
-    }
-  }
-  const schemaLocation = SCHEMA_LOCATIONS[version];
-  node.setAttributeNS(XML_SCHEMA_INSTANCE_URI, 'xsi:schemaLocation', schemaLocation);
-  const featurePrefix = options.featurePrefix ? options.featurePrefix : FEATURE_PREFIX;
-  if (inserts) {
-    obj = {node: node, 'featureNS': options.featureNS,
-      'featureType': options.featureType, 'featurePrefix': featurePrefix,
-      'gmlVersion': gmlVersion, 'hasZ': options.hasZ, 'srsName': options.srsName};
-    assign(obj, baseObj);
-    pushSerializeAndPop(obj,
-      TRANSACTION_SERIALIZERS,
-      makeSimpleNodeFactory('Insert'), inserts,
-      objectStack);
-  }
-  if (updates) {
-    obj = {node: node, 'featureNS': options.featureNS,
-      'featureType': options.featureType, 'featurePrefix': featurePrefix,
-      'gmlVersion': gmlVersion, 'hasZ': options.hasZ, 'srsName': options.srsName};
-    assign(obj, baseObj);
-    pushSerializeAndPop(obj,
-      TRANSACTION_SERIALIZERS,
-      makeSimpleNodeFactory('Update'), updates,
-      objectStack);
-  }
-  if (deletes) {
-    pushSerializeAndPop({node: node, 'featureNS': options.featureNS,
-      'featureType': options.featureType, 'featurePrefix': featurePrefix,
-      'gmlVersion': gmlVersion, 'srsName': options.srsName},
-    TRANSACTION_SERIALIZERS,
-    makeSimpleNodeFactory('Delete'), deletes,
-    objectStack);
-  }
-  if (options.nativeElements) {
-    pushSerializeAndPop({node: node, 'featureNS': options.featureNS,
-      'featureType': options.featureType, 'featurePrefix': featurePrefix,
-      'gmlVersion': gmlVersion, 'srsName': options.srsName},
-    TRANSACTION_SERIALIZERS,
-    makeSimpleNodeFactory('Native'), options.nativeElements,
-    objectStack);
-  }
-  return node;
-};
-
-
-/**
- * Read the projection from a WFS source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @return {?module:ol/proj/Projection} Projection.
- * @api
- */
-WFS.prototype.readProjection;
-
-
-/**
- * @inheritDoc
- */
-WFS.prototype.readProjectionFromDocument = function(doc) {
-  for (let n = doc.firstChild; n; n = n.nextSibling) {
-    if (n.nodeType == Node.ELEMENT_NODE) {
-      return this.readProjectionFromNode(n);
-    }
-  }
-  return null;
-};
-
-
-/**
- * @inheritDoc
- */
-WFS.prototype.readProjectionFromNode = function(node) {
-  if (node.firstElementChild &&
-      node.firstElementChild.firstElementChild) {
-    node = node.firstElementChild.firstElementChild;
-    for (let n = node.firstElementChild; n; n = n.nextElementSibling) {
-      if (!(n.childNodes.length === 0 ||
-          (n.childNodes.length === 1 &&
-          n.firstChild.nodeType === 3))) {
-        const objectStack = [{}];
-        this.gmlFormat_.readGeometryElement(n, objectStack);
-        return getProjection(objectStack.pop().srsName);
-      }
-    }
-  }
-
-  return null;
-};
 export default WFS;

src/ol/format/WKT.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/WKT
  */
-import {inherits} from '../util.js';
 import Feature from '../Feature.js';
 import {transformWithOptions} from '../format/Feature.js';
 import TextFeature from '../format/TextFeature.js';
@@ -17,6 +16,19 @@ import Polygon from '../geom/Polygon.js';
 import SimpleGeometry from '../geom/SimpleGeometry.js';
 
 
+/**
+ * @enum {function (new:module:ol/geom/Geometry, Array, module:ol/geom/GeometryLayout)}
+ */
+const GeometryConstructor = {
+  'POINT': Point,
+  'LINESTRING': LineString,
+  'POLYGON': Polygon,
+  'MULTIPOINT': MultiPoint,
+  'MULTILINESTRING': MultiLineString,
+  'MULTIPOLYGON': MultiPolygon
+};
+
+
 /**
  * @typedef {Object} Options
  * @property {boolean} [splitCollection=false] Whether to split GeometryCollections into
@@ -71,13 +83,25 @@ const TokenType = {
   EOF: 6
 };
 
+/**
+ * @const
+ * @type {Object.<string, string>}
+ */
+const WKTGeometryType = {};
+for (const type in GeometryType) {
+  WKTGeometryType[type] = GeometryType[type].toUpperCase();
+}
+
 
 /**
  * Class to tokenize a WKT string.
- * @param {string} wkt WKT string.
- * @constructor
  */
-const Lexer = function(wkt) {
+class Lexer {
+
+  /**
+   * @param {string} wkt WKT string.
+   */
+  constructor(wkt) {
 
     /**
      * @type {string}
@@ -89,56 +113,51 @@ const Lexer = function(wkt) {
      * @private
      */
     this.index_ = -1;
-};
+  }
 
-
-/**
+  /**
    * @param {string} c Character.
    * @return {boolean} Whether the character is alphabetic.
    * @private
    */
-Lexer.prototype.isAlpha_ = function(c) {
+  isAlpha_(c) {
     return c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z';
-};
+  }
 
-
-/**
+  /**
    * @param {string} c Character.
    * @param {boolean=} opt_decimal Whether the string number
    *     contains a dot, i.e. is a decimal number.
    * @return {boolean} Whether the character is numeric.
    * @private
    */
-Lexer.prototype.isNumeric_ = function(c, opt_decimal) {
+  isNumeric_(c, opt_decimal) {
     const decimal = opt_decimal !== undefined ? opt_decimal : false;
     return c >= '0' && c <= '9' || c == '.' && !decimal;
-};
+  }
 
-
-/**
+  /**
    * @param {string} c Character.
    * @return {boolean} Whether the character is whitespace.
    * @private
    */
-Lexer.prototype.isWhiteSpace_ = function(c) {
+  isWhiteSpace_(c) {
     return c == ' ' || c == '\t' || c == '\r' || c == '\n';
-};
+  }
 
-
-/**
+  /**
    * @return {string} Next string character.
    * @private
    */
-Lexer.prototype.nextChar_ = function() {
+  nextChar_() {
     return this.wkt.charAt(++this.index_);
-};
+  }
 
-
-/**
+  /**
    * Fetch and return the next token.
    * @return {!module:ol/format/WKT~Token} Next string token.
    */
-Lexer.prototype.nextToken = function() {
+  nextToken() {
     const c = this.nextChar_();
     const token = {position: this.index_, value: c};
 
@@ -163,14 +182,13 @@ Lexer.prototype.nextToken = function() {
     }
 
     return token;
-};
+  }
 
-
-/**
+  /**
    * @return {number} Numeric token value.
    * @private
    */
-Lexer.prototype.readNumber_ = function() {
+  readNumber_() {
     let c;
     const index = this.index_;
     let decimal = false;
@@ -192,29 +210,31 @@ Lexer.prototype.readNumber_ = function() {
         scientificNotation && (c == '-' || c == '+')
     );
     return parseFloat(this.wkt.substring(index, this.index_--));
-};
+  }
 
-
-/**
+  /**
    * @return {string} String token value.
    * @private
    */
-Lexer.prototype.readText_ = function() {
+  readText_() {
     let c;
     const index = this.index_;
     do {
       c = this.nextChar_();
     } while (this.isAlpha_(c));
     return this.wkt.substring(index, this.index_--).toUpperCase();
-};
-
+  }
+}
 
 /**
  * Class to parse the tokens from the WKT string.
- * @param {module:ol/format/WKT~Lexer} lexer The lexer.
- * @constructor
  */
-const Parser = function(lexer) {
+class Parser {
+
+  /**
+   * @param {module:ol/format/WKT~Lexer} lexer The lexer.
+   */
+  constructor(lexer) {
 
     /**
      * @type {module:ol/format/WKT~Lexer}
@@ -233,59 +253,55 @@ const Parser = function(lexer) {
      * @private
      */
     this.layout_ = GeometryLayout.XY;
-};
+  }
 
-
-/**
+  /**
    * Fetch the next token form the lexer and replace the active token.
    * @private
    */
-Parser.prototype.consume_ = function() {
+  consume_() {
     this.token_ = this.lexer_.nextToken();
-};
+  }
 
-/**
+  /**
    * Tests if the given type matches the type of the current token.
    * @param {module:ol/format/WKT~TokenType} type Token type.
    * @return {boolean} Whether the token matches the given type.
    */
-Parser.prototype.isTokenType = function(type) {
+  isTokenType(type) {
     const isMatch = this.token_.type == type;
     return isMatch;
-};
+  }
 
-
-/**
+  /**
    * If the given type matches the current token, consume it.
    * @param {module:ol/format/WKT~TokenType} type Token type.
    * @return {boolean} Whether the token matches the given type.
    */
-Parser.prototype.match = function(type) {
+  match(type) {
     const isMatch = this.isTokenType(type);
     if (isMatch) {
       this.consume_();
     }
     return isMatch;
-};
+  }
 
-
-/**
+  /**
    * Try to parse the tokens provided by the lexer.
    * @return {module:ol/geom/Geometry} The geometry.
    */
-Parser.prototype.parse = function() {
+  parse() {
     this.consume_();
     const geometry = this.parseGeometry_();
     return geometry;
-};
+  }
 
-
-/**
+  /**
    * Try to parse the dimensional info.
    * @return {module:ol/geom/GeometryLayout} The layout.
    * @private
    */
-Parser.prototype.parseGeometryLayout_ = function() {
+  parseGeometryLayout_() {
     let layout = GeometryLayout.XY;
     const dimToken = this.token_;
     if (this.isTokenType(TokenType.TEXT)) {
@@ -302,14 +318,13 @@ Parser.prototype.parseGeometryLayout_ = function() {
       }
     }
     return layout;
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<module:ol/geom/Geometry>} A collection of geometries.
    * @private
    */
-Parser.prototype.parseGeometryCollectionText_ = function() {
+  parseGeometryCollectionText_() {
     if (this.match(TokenType.LEFT_PAREN)) {
       const geometries = [];
       do {
@@ -322,14 +337,13 @@ Parser.prototype.parseGeometryCollectionText_ = function() {
       return [];
     }
     throw new Error(this.formatErrorMessage_());
-};
+  }
 
-
-/**
+  /**
    * @return {Array.<number>} All values in a point.
    * @private
    */
-Parser.prototype.parsePointText_ = function() {
+  parsePointText_() {
     if (this.match(TokenType.LEFT_PAREN)) {
       const coordinates = this.parsePoint_();
       if (this.match(TokenType.RIGHT_PAREN)) {
@@ -339,14 +353,13 @@ Parser.prototype.parsePointText_ = function() {
       return null;
     }
     throw new Error(this.formatErrorMessage_());
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} All points in a linestring.
    * @private
    */
-Parser.prototype.parseLineStringText_ = function() {
+  parseLineStringText_() {
     if (this.match(TokenType.LEFT_PAREN)) {
       const coordinates = this.parsePointList_();
       if (this.match(TokenType.RIGHT_PAREN)) {
@@ -356,14 +369,13 @@ Parser.prototype.parseLineStringText_ = function() {
       return [];
     }
     throw new Error(this.formatErrorMessage_());
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} All points in a polygon.
    * @private
    */
-Parser.prototype.parsePolygonText_ = function() {
+  parsePolygonText_() {
     if (this.match(TokenType.LEFT_PAREN)) {
       const coordinates = this.parseLineStringTextList_();
       if (this.match(TokenType.RIGHT_PAREN)) {
@@ -373,14 +385,13 @@ Parser.prototype.parsePolygonText_ = function() {
       return [];
     }
     throw new Error(this.formatErrorMessage_());
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} All points in a multipoint.
    * @private
    */
-Parser.prototype.parseMultiPointText_ = function() {
+  parseMultiPointText_() {
     if (this.match(TokenType.LEFT_PAREN)) {
       let coordinates;
       if (this.token_.type == TokenType.LEFT_PAREN) {
@@ -395,15 +406,14 @@ Parser.prototype.parseMultiPointText_ = function() {
       return [];
     }
     throw new Error(this.formatErrorMessage_());
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} All linestring points
    *                                        in a multilinestring.
    * @private
    */
-Parser.prototype.parseMultiLineStringText_ = function() {
+  parseMultiLineStringText_() {
     if (this.match(TokenType.LEFT_PAREN)) {
       const coordinates = this.parseLineStringTextList_();
       if (this.match(TokenType.RIGHT_PAREN)) {
@@ -413,14 +423,13 @@ Parser.prototype.parseMultiLineStringText_ = function() {
       return [];
     }
     throw new Error(this.formatErrorMessage_());
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} All polygon points in a multipolygon.
    * @private
    */
-Parser.prototype.parseMultiPolygonText_ = function() {
+  parseMultiPolygonText_() {
     if (this.match(TokenType.LEFT_PAREN)) {
       const coordinates = this.parsePolygonTextList_();
       if (this.match(TokenType.RIGHT_PAREN)) {
@@ -430,14 +439,13 @@ Parser.prototype.parseMultiPolygonText_ = function() {
       return [];
     }
     throw new Error(this.formatErrorMessage_());
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<number>} A point.
    * @private
    */
-Parser.prototype.parsePoint_ = function() {
+  parsePoint_() {
     const coordinates = [];
     const dimensions = this.layout_.length;
     for (let i = 0; i < dimensions; ++i) {
@@ -452,84 +460,141 @@ Parser.prototype.parsePoint_ = function() {
       return coordinates;
     }
     throw new Error(this.formatErrorMessage_());
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} An array of points.
    * @private
    */
-Parser.prototype.parsePointList_ = function() {
+  parsePointList_() {
     const coordinates = [this.parsePoint_()];
     while (this.match(TokenType.COMMA)) {
       coordinates.push(this.parsePoint_());
     }
     return coordinates;
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} An array of points.
    * @private
    */
-Parser.prototype.parsePointTextList_ = function() {
+  parsePointTextList_() {
     const coordinates = [this.parsePointText_()];
     while (this.match(TokenType.COMMA)) {
       coordinates.push(this.parsePointText_());
     }
     return coordinates;
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} An array of points.
    * @private
    */
-Parser.prototype.parseLineStringTextList_ = function() {
+  parseLineStringTextList_() {
     const coordinates = [this.parseLineStringText_()];
     while (this.match(TokenType.COMMA)) {
       coordinates.push(this.parseLineStringText_());
     }
     return coordinates;
-};
+  }
 
-
-/**
+  /**
    * @return {!Array.<!Array.<number>>} An array of points.
    * @private
    */
-Parser.prototype.parsePolygonTextList_ = function() {
+  parsePolygonTextList_() {
     const coordinates = [this.parsePolygonText_()];
     while (this.match(TokenType.COMMA)) {
       coordinates.push(this.parsePolygonText_());
     }
     return coordinates;
-};
+  }
 
-
-/**
+  /**
    * @return {boolean} Whether the token implies an empty geometry.
    * @private
    */
-Parser.prototype.isEmptyGeometry_ = function() {
+  isEmptyGeometry_() {
     const isEmpty = this.isTokenType(TokenType.TEXT) &&
         this.token_.value == EMPTY;
     if (isEmpty) {
       this.consume_();
     }
     return isEmpty;
-};
+  }
 
-
-/**
+  /**
    * Create an error message for an unexpected token error.
    * @return {string} Error message.
    * @private
    */
-Parser.prototype.formatErrorMessage_ = function() {
+  formatErrorMessage_() {
     return 'Unexpected `' + this.token_.value + '` at position ' +
         this.token_.position + ' in `' + this.lexer_.wkt + '`';
-};
+  }
+
+  /**
+   * @return {!module:ol/geom/Geometry} The geometry.
+   * @private
+   */
+  parseGeometry_() {
+    const token = this.token_;
+    if (this.match(TokenType.TEXT)) {
+      const geomType = token.value;
+      this.layout_ = this.parseGeometryLayout_();
+      if (geomType == 'GEOMETRYCOLLECTION') {
+        const geometries = this.parseGeometryCollectionText_();
+        return new GeometryCollection(geometries);
+      } else {
+        const ctor = GeometryConstructor[geomType];
+        if (!ctor) {
+          throw new Error('Invalid geometry type: ' + geomType);
+        }
+
+        let coordinates;
+        switch (geomType) {
+          case 'POINT': {
+            coordinates = this.parsePointText_();
+            break;
+          }
+          case 'LINESTRING': {
+            coordinates = this.parseLineStringText_();
+            break;
+          }
+          case 'POLYGON': {
+            coordinates = this.parsePolygonText_();
+            break;
+          }
+          case 'MULTIPOINT': {
+            coordinates = this.parseMultiPointText_();
+            break;
+          }
+          case 'MULTILINESTRING': {
+            coordinates = this.parseMultiLineStringText_();
+            break;
+          }
+          case 'MULTIPOLYGON': {
+            coordinates = this.parseMultiPolygonText_();
+            break;
+          }
+          default: {
+            throw new Error('Invalid geometry type: ' + geomType);
+          }
+        }
+
+        if (!coordinates) {
+          if (ctor === GeometryConstructor['POINT']) {
+            coordinates = [NaN, NaN];
+          } else {
+            coordinates = [];
+          }
+        }
+        return new ctor(coordinates, this.layout_);
+      }
+    }
+    throw new Error(this.formatErrorMessage_());
+  }
+}
 
 
 /**
@@ -537,16 +602,18 @@ Parser.prototype.formatErrorMessage_ = function() {
  * Geometry format for reading and writing data in the `WellKnownText` (WKT)
  * format.
  *
- * @constructor
- * @extends {module:ol/format/TextFeature}
- * @param {module:ol/format/WKT~Options=} opt_options Options.
  * @api
  */
-const WKT = function(opt_options) {
+class WKT extends TextFeature {
+
+  /**
+   * @param {module:ol/format/WKT~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
+    super();
 
     const options = opt_options ? opt_options : {};
 
-  TextFeature.call(this);
 
     /**
      * Split GeometryCollection into multiple features.
@@ -556,9 +623,104 @@ const WKT = function(opt_options) {
     this.splitCollection_ = options.splitCollection !== undefined ?
       options.splitCollection : false;
 
-};
+  }
 
-inherits(WKT, TextFeature);
+  /**
+   * Parse a WKT string.
+   * @param {string} wkt WKT string.
+   * @return {module:ol/geom/Geometry|undefined}
+   *     The geometry created.
+   * @private
+   */
+  parse_(wkt) {
+    const lexer = new Lexer(wkt);
+    const parser = new Parser(lexer);
+    return parser.parse();
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeatureFromText(text, opt_options) {
+    const geom = this.readGeometryFromText(text, opt_options);
+    if (geom) {
+      const feature = new Feature();
+      feature.setGeometry(geom);
+      return feature;
+    }
+    return null;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFeaturesFromText(text, opt_options) {
+    let geometries = [];
+    const geometry = this.readGeometryFromText(text, opt_options);
+    if (this.splitCollection_ &&
+        geometry.getType() == GeometryType.GEOMETRY_COLLECTION) {
+      geometries = (/** @type {module:ol/geom/GeometryCollection} */ (geometry))
+        .getGeometriesArray();
+    } else {
+      geometries = [geometry];
+    }
+    const features = [];
+    for (let i = 0, ii = geometries.length; i < ii; ++i) {
+      const feature = new Feature();
+      feature.setGeometry(geometries[i]);
+      features.push(feature);
+    }
+    return features;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readGeometryFromText(text, opt_options) {
+    const geometry = this.parse_(text);
+    if (geometry) {
+      return (
+        /** @type {module:ol/geom/Geometry} */ (transformWithOptions(geometry, false, opt_options))
+      );
+    } else {
+      return null;
+    }
+  }
+
+  /**
+   * @inheritDoc
+   */
+  writeFeatureText(feature, opt_options) {
+    const geometry = feature.getGeometry();
+    if (geometry) {
+      return this.writeGeometryText(geometry, opt_options);
+    }
+    return '';
+  }
+
+  /**
+   * @inheritDoc
+   */
+  writeFeaturesText(features, opt_options) {
+    if (features.length == 1) {
+      return this.writeFeatureText(features[0], opt_options);
+    }
+    const geometries = [];
+    for (let i = 0, ii = features.length; i < ii; ++i) {
+      geometries.push(features[i].getGeometry());
+    }
+    const collection = new GeometryCollection(geometries);
+    return this.writeGeometryText(collection, opt_options);
+  }
+
+  /**
+   * @inheritDoc
+   */
+  writeGeometryText(geometry, opt_options) {
+    return encode(/** @type {module:ol/geom/Geometry} */ (
+      transformWithOptions(geometry, true, opt_options)));
+  }
+}
 
 
 /**
@@ -712,231 +874,4 @@ function encode(geom) {
 }
 
 
-/**
- * Parse a WKT string.
- * @param {string} wkt WKT string.
- * @return {module:ol/geom/Geometry|undefined}
- *     The geometry created.
- * @private
- */
-WKT.prototype.parse_ = function(wkt) {
-  const lexer = new Lexer(wkt);
-  const parser = new Parser(lexer);
-  return parser.parse();
-};
-
-
-/**
- * Read a feature from a WKT source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/Feature} Feature.
- * @api
- */
-WKT.prototype.readFeature;
-
-
-/**
- * @inheritDoc
- */
-WKT.prototype.readFeatureFromText = function(text, opt_options) {
-  const geom = this.readGeometryFromText(text, opt_options);
-  if (geom) {
-    const feature = new Feature();
-    feature.setGeometry(geom);
-    return feature;
-  }
-  return null;
-};
-
-
-/**
- * Read all features from a WKT source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-WKT.prototype.readFeatures;
-
-
-/**
- * @inheritDoc
- */
-WKT.prototype.readFeaturesFromText = function(text, opt_options) {
-  let geometries = [];
-  const geometry = this.readGeometryFromText(text, opt_options);
-  if (this.splitCollection_ &&
-      geometry.getType() == GeometryType.GEOMETRY_COLLECTION) {
-    geometries = (/** @type {module:ol/geom/GeometryCollection} */ (geometry))
-      .getGeometriesArray();
-  } else {
-    geometries = [geometry];
-  }
-  const features = [];
-  for (let i = 0, ii = geometries.length; i < ii; ++i) {
-    const feature = new Feature();
-    feature.setGeometry(geometries[i]);
-    features.push(feature);
-  }
-  return features;
-};
-
-
-/**
- * Read a single geometry from a WKT source.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
- * @return {module:ol/geom/Geometry} Geometry.
- * @api
- */
-WKT.prototype.readGeometry;
-
-
-/**
- * @inheritDoc
- */
-WKT.prototype.readGeometryFromText = function(text, opt_options) {
-  const geometry = this.parse_(text);
-  if (geometry) {
-    return (
-      /** @type {module:ol/geom/Geometry} */ (transformWithOptions(geometry, false, opt_options))
-    );
-  } else {
-    return null;
-  }
-};
-
-
-/**
- * @enum {function (new:module:ol/geom/Geometry, Array, module:ol/geom/GeometryLayout)}
- */
-const GeometryConstructor = {
-  'POINT': Point,
-  'LINESTRING': LineString,
-  'POLYGON': Polygon,
-  'MULTIPOINT': MultiPoint,
-  'MULTILINESTRING': MultiLineString,
-  'MULTIPOLYGON': MultiPolygon
-};
-
-
-/**
- * @enum {(function(): Array)}
- */
-const GeometryParser = {
-  'POINT': Parser.prototype.parsePointText_,
-  'LINESTRING': Parser.prototype.parseLineStringText_,
-  'POLYGON': Parser.prototype.parsePolygonText_,
-  'MULTIPOINT': Parser.prototype.parseMultiPointText_,
-  'MULTILINESTRING': Parser.prototype.parseMultiLineStringText_,
-  'MULTIPOLYGON': Parser.prototype.parseMultiPolygonText_
-};
-
-
-/**
- * @return {!module:ol/geom/Geometry} The geometry.
- * @private
- */
-Parser.prototype.parseGeometry_ = function() {
-  const token = this.token_;
-  if (this.match(TokenType.TEXT)) {
-    const geomType = token.value;
-    this.layout_ = this.parseGeometryLayout_();
-    if (geomType == GeometryType.GEOMETRY_COLLECTION.toUpperCase()) {
-      const geometries = this.parseGeometryCollectionText_();
-      return new GeometryCollection(geometries);
-    } else {
-      const parser = GeometryParser[geomType];
-      const ctor = GeometryConstructor[geomType];
-      if (!parser || !ctor) {
-        throw new Error('Invalid geometry type: ' + geomType);
-      }
-      const coordinates = parser.call(this);
-      return new ctor(coordinates, this.layout_);
-    }
-  }
-  throw new Error(this.formatErrorMessage_());
-};
-
-
-/**
- * Encode a feature as a WKT string.
- *
- * @function
- * @param {module:ol/Feature} feature Feature.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} WKT string.
- * @api
- */
-WKT.prototype.writeFeature;
-
-
-/**
- * @inheritDoc
- */
-WKT.prototype.writeFeatureText = function(feature, opt_options) {
-  const geometry = feature.getGeometry();
-  if (geometry) {
-    return this.writeGeometryText(geometry, opt_options);
-  }
-  return '';
-};
-
-
-/**
- * Encode an array of features as a WKT string.
- *
- * @function
- * @param {Array.<module:ol/Feature>} features Features.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} WKT string.
- * @api
- */
-WKT.prototype.writeFeatures;
-
-
-/**
- * @inheritDoc
- */
-WKT.prototype.writeFeaturesText = function(features, opt_options) {
-  if (features.length == 1) {
-    return this.writeFeatureText(features[0], opt_options);
-  }
-  const geometries = [];
-  for (let i = 0, ii = features.length; i < ii; ++i) {
-    geometries.push(features[i].getGeometry());
-  }
-  const collection = new GeometryCollection(geometries);
-  return this.writeGeometryText(collection, opt_options);
-};
-
-
-/**
- * Write a single geometry as a WKT string.
- *
- * @function
- * @param {module:ol/geom/Geometry} geometry Geometry.
- * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
- * @return {string} WKT string.
- * @api
- */
-WKT.prototype.writeGeometry;
-
-
-/**
- * @inheritDoc
- */
-WKT.prototype.writeGeometryText = function(geometry, opt_options) {
-  return encode(/** @type {module:ol/geom/Geometry} */ (
-    transformWithOptions(geometry, true, opt_options)));
-};
-
-
 export default WKT;

src/ol/format/WMSCapabilities.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/WMSCapabilities
  */
-import {inherits} from '../util.js';
 import {readHref} from '../format/XLink.js';
 import XML from '../format/XML.js';
 import {readDecimalString, readString, readNonNegativeInteger, readDecimal, readBooleanString, readNonNegativeIntegerString} from '../format/xsd.js';
@@ -9,27 +8,6 @@ import {makeArrayPusher, makeObjectPropertyPusher, makeObjectPropertySetter,
   makeStructureNS, pushParseAndPop} from '../xml.js';
 
 
-/**
- * @classdesc
- * Format for reading WMS capabilities data
- *
- * @constructor
- * @extends {module:ol/format/XML}
- * @api
- */
-const WMSCapabilities = function() {
-
-  XML.call(this);
-
-  /**
-   * @type {string|undefined}
-   */
-  this.version = undefined;
-};
-
-inherits(WMSCapabilities, XML);
-
-
 /**
  * @const
  * @type {Array.<null|string>}
@@ -63,6 +41,47 @@ const CAPABILITY_PARSERS = makeStructureNS(
   });
 
 
+/**
+ * @classdesc
+ * Format for reading WMS capabilities data
+ *
+ * @api
+ */
+class WMSCapabilities extends XML {
+  constructor() {
+    super();
+
+    /**
+     * @type {string|undefined}
+     */
+    this.version = undefined;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFromDocument(doc) {
+    for (let n = doc.firstChild; n; n = n.nextSibling) {
+      if (n.nodeType == Node.ELEMENT_NODE) {
+        return this.readFromNode(n);
+      }
+    }
+    return null;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFromNode(node) {
+    this.version = node.getAttribute('version').trim();
+    const wmsCapabilityObject = pushParseAndPop({
+      'version': this.version
+    }, PARSERS, node, []);
+    return wmsCapabilityObject ? wmsCapabilityObject : null;
+  }
+}
+
+
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
@@ -266,42 +285,6 @@ const KEYWORDLIST_PARSERS = makeStructureNS(
   });
 
 
-/**
- * Read a WMS capabilities document.
- *
- * @function
- * @param {Document|Node|string} source The XML source.
- * @return {Object} An object representing the WMS capabilities.
- * @api
- */
-WMSCapabilities.prototype.read;
-
-
-/**
- * @inheritDoc
- */
-WMSCapabilities.prototype.readFromDocument = function(doc) {
-  for (let n = doc.firstChild; n; n = n.nextSibling) {
-    if (n.nodeType == Node.ELEMENT_NODE) {
-      return this.readFromNode(n);
-    }
-  }
-  return null;
-};
-
-
-/**
- * @inheritDoc
- */
-WMSCapabilities.prototype.readFromNode = function(node) {
-  this.version = node.getAttribute('version').trim();
-  const wmsCapabilityObject = pushParseAndPop({
-    'version': this.version
-  }, PARSERS, node, []);
-  return wmsCapabilityObject ? wmsCapabilityObject : null;
-};
-
-
 /**
  * @param {Node} node Node.
  * @param {Array.<*>} objectStack Object stack.

src/ol/format/WMSGetFeatureInfo.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/WMSGetFeatureInfo
  */
-import {inherits} from '../util.js';
 import {extend, includes} from '../array.js';
 import GML2 from '../format/GML2.js';
 import XMLFeature from '../format/XMLFeature.js';
@@ -15,17 +14,34 @@ import {makeArrayPusher, makeStructureNS, pushParseAndPop} from '../xml.js';
  */
 
 
+/**
+ * @const
+ * @type {string}
+ */
+const featureIdentifier = '_feature';
+
+
+/**
+ * @const
+ * @type {string}
+ */
+const layerIdentifier = '_layer';
+
+
 /**
  * @classdesc
  * Format for reading WMSGetFeatureInfo format. It uses
  * {@link module:ol/format/GML2~GML2} to read features.
  *
- * @constructor
- * @extends {module:ol/format/XMLFeature}
- * @param {module:ol/format/WMSGetFeatureInfo~Options=} opt_options Options.
  * @api
  */
-const WMSGetFeatureInfo = function(opt_options) {
+class WMSGetFeatureInfo extends XMLFeature {
+
+  /**
+   * @param {module:ol/format/WMSGetFeatureInfo~Options=} opt_options Options.
+   */
+  constructor(opt_options) {
+    super();
 
     const options = opt_options ? opt_options : {};
 
@@ -48,50 +64,29 @@ const WMSGetFeatureInfo = function(opt_options) {
      * @type {Array.<string>}
      */
     this.layers_ = options.layers ? options.layers : null;
+  }
 
-  XMLFeature.call(this);
-};
-
-inherits(WMSGetFeatureInfo, XMLFeature);
-
-
-/**
- * @const
- * @type {string}
- */
-const featureIdentifier = '_feature';
-
-
-/**
- * @const
- * @type {string}
- */
-const layerIdentifier = '_layer';
-
-
-/**
+  /**
    * @return {Array.<string>} layers
    */
-WMSGetFeatureInfo.prototype.getLayers = function() {
+  getLayers() {
     return this.layers_;
-};
+  }
 
-
-/**
+  /**
    * @param {Array.<string>} layers Layers to parse.
    */
-WMSGetFeatureInfo.prototype.setLayers = function(layers) {
+  setLayers(layers) {
     this.layers_ = layers;
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {Array.<*>} objectStack Object stack.
    * @return {Array.<module:ol/Feature>} Features.
    * @private
    */
-WMSGetFeatureInfo.prototype.readFeatures_ = function(node, objectStack) {
+  readFeatures_(node, objectStack) {
     node.setAttribute('namespaceURI', this.featureNS_);
     const localName = node.localName;
     /** @type {Array.<module:ol/Feature>} */
@@ -142,50 +137,37 @@ WMSGetFeatureInfo.prototype.readFeatures_ = function(node, objectStack) {
       }
     }
     return features;
-};
+  }
 
-
-/**
- * Read all features from a WMSGetFeatureInfo response.
- *
- * @function
- * @param {Document|Node|Object|string} source Source.
- * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
- * @return {Array.<module:ol/Feature>} Features.
- * @api
- */
-WMSGetFeatureInfo.prototype.readFeatures;
-
-
-/**
+  /**
    * @inheritDoc
    */
-WMSGetFeatureInfo.prototype.readFeaturesFromNode = function(node, opt_options) {
+  readFeaturesFromNode(node, opt_options) {
     const options = {};
     if (opt_options) {
       assign(options, this.getReadOptions(node, opt_options));
     }
     return this.readFeatures_(node, [options]);
-};
+  }
 
-
-/**
+  /**
    * Not implemented.
    * @inheritDoc
    */
-WMSGetFeatureInfo.prototype.writeFeatureNode = function(feature, opt_options) {};
+  writeFeatureNode(feature, opt_options) {}
 
-
-/**
+  /**
    * Not implemented.
    * @inheritDoc
    */
-WMSGetFeatureInfo.prototype.writeFeaturesNode = function(features, opt_options) {};
+  writeFeaturesNode(features, opt_options) {}
 
-
-/**
+  /**
    * Not implemented.
    * @inheritDoc
    */
-WMSGetFeatureInfo.prototype.writeGeometryNode = function(geometry, opt_options) {};
+  writeGeometryNode(geometry, opt_options) {}
+}
+
+
 export default WMSGetFeatureInfo;

src/ol/format/WMTSCapabilities.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/WMTSCapabilities
  */
-import {inherits} from '../util.js';
 import {boundingExtent} from '../extent.js';
 import OWS from '../format/OWS.js';
 import {readHref} from '../format/XLink.js';
@@ -10,26 +9,6 @@ import {readString, readNonNegativeInteger, readDecimal} from '../format/xsd.js'
 import {pushParseAndPop, makeStructureNS,
   makeObjectPropertySetter, makeObjectPropertyPusher, makeArrayPusher} from '../xml.js';
 
-/**
- * @classdesc
- * Format for reading WMTS capabilities data.
- *
- * @constructor
- * @extends {module:ol/format/XML}
- * @api
- */
-const WMTSCapabilities = function() {
-  XML.call(this);
-
-  /**
-   * @type {module:ol/format/OWS}
-   * @private
-   */
-  this.owsParser_ = new OWS();
-};
-
-inherits(WMTSCapabilities, XML);
-
 
 /**
  * @const
@@ -61,6 +40,51 @@ const PARSERS = makeStructureNS(
   });
 
 
+/**
+ * @classdesc
+ * Format for reading WMTS capabilities data.
+ *
+  * @api
+ */
+class WMTSCapabilities extends XML {
+  constructor() {
+    super();
+
+    /**
+     * @type {module:ol/format/OWS}
+     * @private
+     */
+    this.owsParser_ = new OWS();
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFromDocument(doc) {
+    for (let n = doc.firstChild; n; n = n.nextSibling) {
+      if (n.nodeType == Node.ELEMENT_NODE) {
+        return this.readFromNode(n);
+      }
+    }
+    return null;
+  }
+
+  /**
+   * @inheritDoc
+   */
+  readFromNode(node) {
+    const version = node.getAttribute('version').trim();
+    let WMTSCapabilityObject = this.owsParser_.readFromNode(node);
+    if (!WMTSCapabilityObject) {
+      return null;
+    }
+    WMTSCapabilityObject['version'] = version;
+    WMTSCapabilityObject = pushParseAndPop(WMTSCapabilityObject, PARSERS, node, []);
+    return WMTSCapabilityObject ? WMTSCapabilityObject : null;
+  }
+}
+
+
 /**
  * @const
  * @type {Object.<string, Object.<string, module:ol/xml~Parser>>}
@@ -193,45 +217,6 @@ const TM_PARSERS = makeStructureNS(
   }));
 
 
-/**
- * Read a WMTS capabilities document.
- *
- * @function
- * @param {Document|Node|string} source The XML source.
- * @return {Object} An object representing the WMTS capabilities.
- * @api
- */
-WMTSCapabilities.prototype.read;
-
-
-/**
- * @inheritDoc
- */
-WMTSCapabilities.prototype.readFromDocument = function(doc) {
-  for (let n = doc.firstChild; n; n = n.nextSibling) {
-    if (n.nodeType == Node.ELEMENT_NODE) {
-      return this.readFromNode(n);
-    }
-  }
-  return null;
-};
-
-
-/**
- * @inheritDoc
- */
-WMTSCapabilities.prototype.readFromNode = function(node) {
-  const version = node.getAttribute('version').trim();
-  let WMTSCapabilityObject = this.owsParser_.readFromNode(node);
-  if (!WMTSCapabilityObject) {
-    return null;
-  }
-  WMTSCapabilityObject['version'] = version;
-  WMTSCapabilityObject = pushParseAndPop(WMTSCapabilityObject, PARSERS, node, []);
-  return WMTSCapabilityObject ? WMTSCapabilityObject : null;
-};
-
-
 /**
  * @param {Node} node Node.
  * @param {Array.<*>} objectStack Object stack.

src/ol/format/XLink.js

@@ -12,7 +12,7 @@ const NAMESPACE_URI = 'http://www.w3.org/1999/xlink';
 
 /**
  * @param {Node} node Node.
- * @return {boolean|undefined} Boolean.
+ * @return {string|undefined} href.
  */
 export function readHref(node) {
   return node.getAttributeNS(NAMESPACE_URI, 'href');

src/ol/format/XML.js

@@ -7,19 +7,17 @@ import {isDocument, isNode, parse} from '../xml.js';
  * @classdesc
  * Generic format for reading non-feature XML data
  *
- * @constructor
  * @abstract
- * @struct
  */
-const XML = function() {
-};
-
-
-/**
- * @param {Document|Node|string} source Source.
- * @return {Object} The parsed result.
+class XML {
+  /**
+   * Read the source document.
+   *
+   * @param {Document|Node|string} source The XML source.
+   * @return {Object} An object representing the source.
+   * @api
    */
-XML.prototype.read = function(source) {
+  read(source) {
     if (isDocument(source)) {
       return this.readFromDocument(/** @type {Document} */ (source));
     } else if (isNode(source)) {
@@ -30,21 +28,21 @@ XML.prototype.read = function(source) {
     } else {
       return null;
     }
-};
+  }
 
-
-/**
+  /**
    * @abstract
    * @param {Document} doc Document.
    * @return {Object} Object
    */
-XML.prototype.readFromDocument = function(doc) {};
+  readFromDocument(doc) {}
 
-
-/**
+  /**
    * @abstract
    * @param {Node} node Node.
    * @return {Object} Object
    */
-XML.prototype.readFromNode = function(node) {};
+  readFromNode(node) {}
+}
+
 export default XML;

src/ol/format/XMLFeature.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/XMLFeature
  */
-import {inherits} from '../util.js';
 import {extend} from '../array.js';
 import FeatureFormat from '../format/Feature.js';
 import FormatType from '../format/FormatType.js';
@@ -13,36 +12,35 @@ import {isDocument, isNode, parse} from '../xml.js';
  * instantiated in apps.
  * Base class for XML feature formats.
  *
- * @constructor
  * @abstract
- * @extends {module:ol/format/Feature}
  */
-const XMLFeature = function() {
+class XMLFeature extends FeatureFormat {
+  constructor() {
+    super();
 
     /**
      * @type {XMLSerializer}
      * @private
      */
     this.xmlSerializer_ = new XMLSerializer();
+  }
 
-  FeatureFormat.call(this);
-};
-
-inherits(XMLFeature, FeatureFormat);
-
-
-/**
+  /**
    * @inheritDoc
    */
-XMLFeature.prototype.getType = function() {
+  getType() {
     return FormatType.XML;
-};
+  }
 
-
-/**
- * @inheritDoc
+  /**
+   * Read a single feature.
+   *
+   * @param {Document|Node|Object|string} source Source.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.
+   * @return {module:ol/Feature} Feature.
+   * @api
    */
-XMLFeature.prototype.readFeature = function(source, opt_options) {
+  readFeature(source, opt_options) {
     if (isDocument(source)) {
       return this.readFeatureFromDocument(/** @type {Document} */ (source), opt_options);
     } else if (isNode(source)) {
@@ -53,38 +51,41 @@ XMLFeature.prototype.readFeature = function(source, opt_options) {
     } else {
       return null;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Document} doc Document.
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
    * @return {module:ol/Feature} Feature.
    */
-XMLFeature.prototype.readFeatureFromDocument = function(doc, opt_options) {
+  readFeatureFromDocument(doc, opt_options) {
     const features = this.readFeaturesFromDocument(doc, opt_options);
     if (features.length > 0) {
       return features[0];
     } else {
       return null;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
    * @return {module:ol/Feature} Feature.
    */
-XMLFeature.prototype.readFeatureFromNode = function(node, opt_options) {
+  readFeatureFromNode(node, opt_options) {
     return null; // not implemented
-};
+  }
 
-
-/**
- * @inheritDoc
+  /**
+   * Read all features from a feature collection.
+   *
+   * @function
+   * @param {Document|Node|Object|string} source Source.
+   * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
+   * @return {Array.<module:ol/Feature>} Features.
+   * @api
    */
-XMLFeature.prototype.readFeatures = function(source, opt_options) {
+  readFeatures(source, opt_options) {
     if (isDocument(source)) {
       return this.readFeaturesFromDocument(
         /** @type {Document} */ (source), opt_options);
@@ -96,16 +97,15 @@ XMLFeature.prototype.readFeatures = function(source, opt_options) {
     } else {
       return [];
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Document} doc Document.
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
    * @protected
    * @return {Array.<module:ol/Feature>} Features.
    */
-XMLFeature.prototype.readFeaturesFromDocument = function(doc, opt_options) {
+  readFeaturesFromDocument(doc, opt_options) {
     /** @type {Array.<module:ol/Feature>} */
     const features = [];
     for (let n = doc.firstChild; n; n = n.nextSibling) {
@@ -114,23 +114,21 @@ XMLFeature.prototype.readFeaturesFromDocument = function(doc, opt_options) {
       }
     }
     return features;
-};
+  }
 
-
-/**
+  /**
    * @abstract
    * @param {Node} node Node.
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
    * @protected
    * @return {Array.<module:ol/Feature>} Features.
    */
-XMLFeature.prototype.readFeaturesFromNode = function(node, opt_options) {};
+  readFeaturesFromNode(node, opt_options) {}
 
-
-/**
+  /**
    * @inheritDoc
    */
-XMLFeature.prototype.readGeometry = function(source, opt_options) {
+  readGeometry(source, opt_options) {
     if (isDocument(source)) {
       return this.readGeometryFromDocument(
         /** @type {Document} */ (source), opt_options);
@@ -142,35 +140,36 @@ XMLFeature.prototype.readGeometry = function(source, opt_options) {
     } else {
       return null;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Document} doc Document.
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
    * @protected
    * @return {module:ol/geom/Geometry} Geometry.
    */
-XMLFeature.prototype.readGeometryFromDocument = function(doc, opt_options) {
+  readGeometryFromDocument(doc, opt_options) {
     return null; // not implemented
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.
    * @protected
    * @return {module:ol/geom/Geometry} Geometry.
    */
-XMLFeature.prototype.readGeometryFromNode = function(node, opt_options) {
+  readGeometryFromNode(node, opt_options) {
     return null; // not implemented
-};
+  }
 
-
-/**
- * @inheritDoc
+  /**
+   * Read the projection from the source.
+   *
+   * @param {Document|Node|Object|string} source Source.
+   * @return {module:ol/proj/Projection} Projection.
+   * @api
    */
-XMLFeature.prototype.readProjection = function(source) {
+  readProjection(source) {
     if (isDocument(source)) {
       return this.readProjectionFromDocument(/** @type {Document} */ (source));
     } else if (isNode(source)) {
@@ -181,83 +180,83 @@ XMLFeature.prototype.readProjection = function(source) {
     } else {
       return null;
     }
-};
+  }
 
-
-/**
+  /**
    * @param {Document} doc Document.
    * @protected
    * @return {module:ol/proj/Projection} Projection.
    */
-XMLFeature.prototype.readProjectionFromDocument = function(doc) {
+  readProjectionFromDocument(doc) {
     return this.dataProjection;
-};
+  }
 
-
-/**
+  /**
    * @param {Node} node Node.
    * @protected
    * @return {module:ol/proj/Projection} Projection.
    */
-XMLFeature.prototype.readProjectionFromNode = function(node) {
+  readProjectionFromNode(node) {
     return this.dataProjection;
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-XMLFeature.prototype.writeFeature = function(feature, opt_options) {
+  writeFeature(feature, opt_options) {
     const node = this.writeFeatureNode(feature, opt_options);
     return this.xmlSerializer_.serializeToString(node);
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/Feature} feature Feature.
    * @param {module:ol/format/Feature~WriteOptions=} opt_options Options.
    * @protected
    * @return {Node} Node.
    */
-XMLFeature.prototype.writeFeatureNode = function(feature, opt_options) {
+  writeFeatureNode(feature, opt_options) {
     return null; // not implemented
-};
+  }
 
-
-/**
- * @inheritDoc
+  /**
+   * Encode an array of features as string.
+   *
+   * @param {Array.<module:ol/Feature>} features Features.
+   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.
+   * @return {string} Result.
+   * @api
    */
-XMLFeature.prototype.writeFeatures = function(features, opt_options) {
+  writeFeatures(features, opt_options) {
     const node = this.writeFeaturesNode(features, opt_options);
     return this.xmlSerializer_.serializeToString(node);
-};
+  }
 
-
-/**
+  /**
    * @param {Array.<module:ol/Feature>} features Features.
    * @param {module:ol/format/Feature~WriteOptions=} opt_options Options.
    * @return {Node} Node.
    */
-XMLFeature.prototype.writeFeaturesNode = function(features, opt_options) {
+  writeFeaturesNode(features, opt_options) {
     return null; // not implemented
-};
+  }
 
-
-/**
+  /**
    * @inheritDoc
    */
-XMLFeature.prototype.writeGeometry = function(geometry, opt_options) {
+  writeGeometry(geometry, opt_options) {
     const node = this.writeGeometryNode(geometry, opt_options);
     return this.xmlSerializer_.serializeToString(node);
-};
+  }
 
-
-/**
+  /**
    * @param {module:ol/geom/Geometry} geometry Geometry.
    * @param {module:ol/format/Feature~WriteOptions=} opt_options Options.
    * @return {Node} Node.
    */
-XMLFeature.prototype.writeGeometryNode = function(geometry, opt_options) {
+  writeGeometryNode(geometry, opt_options) {
     return null; // not implemented
-};
+  }
+}
+
+
 export default XMLFeature;

src/ol/format/filter/And.js

@@ -1,23 +1,24 @@
 /**
  * @module ol/format/filter/And
  */
-import {inherits} from '../../util.js';
 import LogicalNary from '../filter/LogicalNary.js';
 
 /**
  * @classdesc
  * Represents a logical `<And>` operator between two or more filter conditions.
  *
- * @constructor
  * @abstract
- * @param {...module:ol/format/filter/Filter} conditions Conditions.
- * @extends {module:ol/format/filter/LogicalNary}
  */
-const And = function(conditions) {
-  const params = ['And'].concat(Array.prototype.slice.call(arguments));
-  LogicalNary.apply(this, params);
-};
+class And extends LogicalNary {
 
-inherits(And, LogicalNary);
+  /**
+   * @param {...module:ol/format/filter/Filter} conditions Conditions.
+   */
+  constructor(conditions) {
+    const params = ['And'].concat(Array.prototype.slice.call(arguments));
+    super(...params);
+  }
+
+}
 
 export default And;

src/ol/format/filter/Bbox.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/filter/Bbox
  */
-import {inherits} from '../../util.js';
 import Filter from '../filter/Filter.js';
 
 /**
@@ -9,17 +8,19 @@ import Filter from '../filter/Filter.js';
  * Represents a `<BBOX>` operator to test whether a geometry-valued property
  * intersects a fixed bounding box
  *
- * @constructor
- * @param {!string} geometryName Geometry name to use.
- * @param {!module:ol/extent~Extent} extent Extent.
- * @param {string=} opt_srsName SRS name. No srsName attribute will be
- *    set on geometries when this is not provided.
- * @extends {module:ol/format/filter/Filter}
  * @api
  */
-const Bbox = function(geometryName, extent, opt_srsName) {
+class Bbox extends Filter {
 
-  Filter.call(this, 'BBOX');
+  /**
+   * @param {!string} geometryName Geometry name to use.
+   * @param {!module:ol/extent~Extent} extent Extent.
+   * @param {string=} opt_srsName SRS name. No srsName attribute will be set
+   * on geometries when this is not provided.
+   */
+  constructor(geometryName, extent, opt_srsName) {
+
+    super('BBOX');
 
     /**
      * @type {!string}
@@ -35,8 +36,8 @@ const Bbox = function(geometryName, extent, opt_srsName) {
      * @type {string|undefined}
      */
     this.srsName = opt_srsName;
-};
+  }
 
-inherits(Bbox, Filter);
+}
 
 export default Bbox;

src/ol/format/filter/Comparison.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/filter/Comparison
  */
-import {inherits} from '../../util.js';
 import Filter from '../filter/Filter.js';
 
 /**
@@ -9,22 +8,24 @@ import Filter from '../filter/Filter.js';
  * Abstract class; normally only used for creating subclasses and not instantiated in apps.
  * Base class for WFS GetFeature property comparison filters.
  *
- * @constructor
  * @abstract
+ */
+class Comparison extends Filter {
+
+  /**
    * @param {!string} tagName The XML tag name for this filter.
    * @param {!string} propertyName Name of the context property to compare.
- * @extends {module:ol/format/filter/Filter}
    */
-const Comparison = function(tagName, propertyName) {
+  constructor(tagName, propertyName) {
 
-  Filter.call(this, tagName);
+    super(tagName);
 
     /**
      * @type {!string}
      */
     this.propertyName = propertyName;
-};
+  }
 
-inherits(Comparison, Filter);
+}
 
 export default Comparison;

src/ol/format/filter/ComparisonBinary.js

@@ -1,7 +1,6 @@
 /**
  * @module ol/format/filter/ComparisonBinary
  */
-import {inherits} from '../../util.js';
 import Comparison from '../filter/Comparison.js';
 
 /**
@@ -9,17 +8,19 @@ import Comparison from '../filter/Comparison.js';
  * Abstract class; normally only used for creating subclasses and not instantiated in apps.
  * Base class for WFS GetFeature property binary comparison filters.
  *
- * @constructor
  * @abstract
+ */
+class ComparisonBinary extends Comparison {
+
+  /**
    * @param {!string} tagName The XML tag name for this filter.
    * @param {!string} propertyName Name of the context property to compare.
    * @param {!(string|number)} expression The value to compare.
    * @param {boolean=} opt_matchCase Case-sensitive?
- * @extends {module:ol/format/filter/Comparison}
    */
-const ComparisonBinary = function(tagName, propertyName, expression, opt_matchCase) {
+  constructor(tagName, propertyName, expression, opt_matchCase) {
 
-  Comparison.call(this, tagName, propertyName);
+    super(tagName, propertyName);
 
     /**
      * @type {!(string|number)}
@@ -30,7 +31,8 @@ const ComparisonBinary = function(tagName, propertyName, expression, opt_matchCa
      * @type {boolean|undefined}
      */
     this.matchCase = opt_matchCase;
-};
+  }
+
+}
 
-inherits(ComparisonBinary, Comparison);
 export default ComparisonBinary;

src/ol/format/filter/Contains.js

@@ -1,27 +1,28 @@
 /**
  * @module ol/format/filter/Contains
  */
-import {inherits} from '../../util.js';
 import Spatial from '../filter/Spatial.js';
 
 /**
  * @classdesc
  * Represents a `<Contains>` operator to test whether a geometry-valued property
  * contains a given geometry.
- *
- * @constructor
+ */
+class Contains extends Spatial {
+
+  /**
    * @param {!string} geometryName Geometry name to use.
    * @param {!module:ol/geom/Geometry} geometry Geometry.
    * @param {string=} opt_srsName SRS name. No srsName attribute will be
    *    set on geometries when this is not provided.
- * @extends {module:ol/format/filter/Spatial}
    * @api
    */
-const Contains = function(geometryName, geometry, opt_srsName) {
+  constructor(geometryName, geometry, opt_srsName) {
 
-  Spatial.call(this, 'Contains', geometryName, geometry, opt_srsName);
+    super('Contains', geometryName, geometry, opt_srsName);
 
-};
+  }
+
+}
 
-inherits(Contains, Spatial);
 export default Contains;

src/ol/format/filter/During.js

@@ -1,22 +1,22 @@
 /**
  * @module ol/format/filter/During
  */
-import {inherits} from '../../util.js';
 import Comparison from '../filter/Comparison.js';
 
 /**
  * @classdesc
  * Represents a `<During>` comparison operator.
- *
- * @constructor
+ */
+class During extends Comparison {
+
+  /**
    * @param {!string} propertyName Name of the context property to compare.
    * @param {!string} begin The begin date in ISO-8601 format.
    * @param {!string} end The end date in ISO-8601 format.
- * @extends {module:ol/format/filter/Comparison}
    * @api
    */
-const During = function(propertyName, begin, end) {
-  Comparison.call(this, 'During', propertyName);
+  constructor(propertyName, begin, end) {
+    super('During', propertyName);
 
     /**
      * @type {!string}
@@ -27,7 +27,8 @@ const During = function(propertyName, begin, end) {
      * @type {!string}
      */
     this.end = end;
-};
+  }
+
+}
 
-inherits(During, Comparison);
 export default During;

src/ol/format/filter/EqualTo.js

@@ -1,23 +1,24 @@
 /**
  * @module ol/format/filter/EqualTo
  */
-import {inherits} from '../../util.js';
 import ComparisonBinary from '../filter/ComparisonBinary.js';
 
 /**
  * @classdesc
  * Represents a `<PropertyIsEqualTo>` comparison operator.
- *
- * @constructor
+ */
+class EqualTo extends ComparisonBinary {
+
+  /**
    * @param {!string} propertyName Name of the context property to compare.
    * @param {!(string|number)} expression The value to compare.
    * @param {boolean=} opt_matchCase Case-sensitive?
- * @extends {module:ol/format/filter/ComparisonBinary}
    * @api
    */
-const EqualTo = function(propertyName, expression, opt_matchCase) {
-  ComparisonBinary.call(this, 'PropertyIsEqualTo', propertyName, expression, opt_matchCase);
-};
+  constructor(propertyName, expression, opt_matchCase) {
+    super('PropertyIsEqualTo', propertyName, expression, opt_matchCase);
+  }
+
+}
 
-inherits(EqualTo, ComparisonBinary);
 export default EqualTo;

src/ol/format/filter/Filter.js

@@ -8,26 +8,28 @@
  * Abstract class; normally only used for creating subclasses and not instantiated in apps.
  * Base class for WFS GetFeature filters.
  *
- * @constructor
  * @abstract
- * @param {!string} tagName The XML tag name for this filter.
- * @struct
  */
-const Filter = function(tagName) {
+class Filter {
+  /**
+   * @param {!string} tagName The XML tag name for this filter.
+   */
+  constructor(tagName) {
 
     /**
      * @private
      * @type {!string}
      */
     this.tagName_ = tagName;
-};
+  }
 
-/**
+  /**
    * The XML tag name for a filter.
    * @returns {!string} Name.
    */
-Filter.prototype.getTagName = function() {
+  getTagName() {
     return this.tagName_;
-};
+  }
+}
 
 export default Filter;

src/ol/format/filter/GreaterThan.js

@@ -1,22 +1,23 @@
 /**
  * @module ol/format/filter/GreaterThan
  */
-import {inherits} from '../../util.js';
 import ComparisonBinary from '../filter/ComparisonBinary.js';
 
 /**
  * @classdesc
  * Represents a `<PropertyIsGreaterThan>` comparison operator.
- *
- * @constructor
+ */
+class GreaterThan extends ComparisonBinary {
+
+  /**
    * @param {!string} propertyName Name of the context property to compare.
    * @param {!number} expression The value to compare.
- * @extends {module:ol/format/filter/ComparisonBinary}
    * @api
    */
-const GreaterThan = function(propertyName, expression) {
-  ComparisonBinary.call(this, 'PropertyIsGreaterThan', propertyName, expression);
-};
+  constructor(propertyName, expression) {
+    super('PropertyIsGreaterThan', propertyName, expression);
+  }
+
+}
 
-inherits(GreaterThan, ComparisonBinary);
 export default GreaterThan;

src/ol/format/filter/GreaterThanOrEqualTo.js

@@ -1,22 +1,23 @@
 /**
  * @module ol/format/filter/GreaterThanOrEqualTo
  */
-import {inherits} from '../../util.js';
 import ComparisonBinary from '../filter/ComparisonBinary.js';
 
 /**
  * @classdesc
  * Represents a `<PropertyIsGreaterThanOrEqualTo>` comparison operator.
- *
- * @constructor
+ */
+class GreaterThanOrEqualTo extends ComparisonBinary {
+
+  /**
    * @param {!string} propertyName Name of the context property to compare.
    * @param {!number} expression The value to compare.
- * @extends {module:ol/format/filter/ComparisonBinary}
    * @api
    */
-const GreaterThanOrEqualTo = function(propertyName, expression) {
-  ComparisonBinary.call(this, 'PropertyIsGreaterThanOrEqualTo', propertyName, expression);
-};
+  constructor(propertyName, expression) {
+    super('PropertyIsGreaterThanOrEqualTo', propertyName, expression);
+  }
+
+}
 
-inherits(GreaterThanOrEqualTo, ComparisonBinary);
 export default GreaterThanOrEqualTo;

src/ol/format/filter/Intersects.js

@@ -1,27 +1,25 @@
 /**
  * @module ol/format/filter/Intersects
  */
-import {inherits} from '../../util.js';
 import Spatial from '../filter/Spatial.js';
 
 /**
  * @classdesc
  * Represents a `<Intersects>` operator to test whether a geometry-valued property
  * intersects a given geometry.
- *
- * @constructor
+ */
+class Intersects extends Spatial {
+
+  /**
    * @param {!string} geometryName Geometry name to use.
    * @param {!module:ol/geom/Geometry} geometry Geometry.
    * @param {string=} opt_srsName SRS name. No srsName attribute will be
    *    set on geometries when this is not provided.
- * @extends {module:ol/format/filter/Spatial}
- * @api
    */
-const Intersects = function(geometryName, geometry, opt_srsName) {
+  constructor(geometryName, geometry, opt_srsName) {
+    super('Intersects', geometryName, geometry, opt_srsName);
+  }
 
-  Spatial.call(this, 'Intersects', geometryName, geometry, opt_srsName);
+}
 
-};
-
-inherits(Intersects, Spatial);
 export default Intersects;

src/ol/format/filter/IsBetween.js

@@ -1,22 +1,22 @@
 /**
  * @module ol/format/filter/IsBetween
  */
-import {inherits} from '../../util.js';
 import Comparison from '../filter/Comparison.js';
 
 /**
  * @classdesc
  * Represents a `<PropertyIsBetween>` comparison operator.
- *
- * @constructor
+ */
+class IsBetween extends Comparison {
+
+  /**
    * @param {!string} propertyName Name of the context property to compare.
    * @param {!number} lowerBoundary The lower bound of the range.
    * @param {!number} upperBoundary The upper bound of the range.
- * @extends {module:ol/format/filter/Comparison}
    * @api
    */
-const IsBetween = function(propertyName, lowerBoundary, upperBoundary) {
-  Comparison.call(this, 'PropertyIsBetween', propertyName);
+  constructor(propertyName, lowerBoundary, upperBoundary) {
+    super('PropertyIsBetween', propertyName);
 
     /**
      * @type {!number}
@@ -27,7 +27,8 @@ const IsBetween = function(propertyName, lowerBoundary, upperBoundary) {
      * @type {!number}
      */
     this.upperBoundary = upperBoundary;
-};
 
-inherits(IsBetween, Comparison);
+  }
+}
+
 export default IsBetween;

src/ol/format/filter/IsLike.js

@@ -1,14 +1,16 @@
 /**
  * @module ol/format/filter/IsLike
  */
-import {inherits} from '../../util.js';
 import Comparison from '../filter/Comparison.js';
 
 /**
  * @classdesc
  * Represents a `<PropertyIsLike>` comparison operator.
- *
- * @constructor
+ */
+class IsLike extends Comparison {
+
+  /**
+   * [constructor description]
    * @param {!string} propertyName Name of the context property to compare.
    * @param {!string} pattern Text pattern.
    * @param {string=} opt_wildCard Pattern character which matches any sequence of
@@ -18,11 +20,10 @@ import Comparison from '../filter/Comparison.js';
    * @param {string=} opt_escapeChar Escape character which can be used to escape
    *    the pattern characters. Default is '!'.
    * @param {boolean=} opt_matchCase Case-sensitive?
- * @extends {module:ol/format/filter/Comparison}
    * @api
    */
-const IsLike = function(propertyName, pattern, opt_wildCard, opt_singleChar, opt_escapeChar, opt_matchCase) {
-  Comparison.call(this, 'PropertyIsLike', propertyName);
+  constructor(propertyName, pattern, opt_wildCard, opt_singleChar, opt_escapeChar, opt_matchCase) {
+    super('PropertyIsLike', propertyName);
 
     /**
      * @type {!string}
@@ -48,7 +49,8 @@ const IsLike = function(propertyName, pattern, opt_wildCard, opt_singleChar, opt
      * @type {boolean|undefined}
      */
     this.matchCase = opt_matchCase;
-};
 
-inherits(IsLike, Comparison);
+  }
+}
+
 export default IsLike;