diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000000..242e95ee03
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,9 @@
+{
+  "plugins": ["jsdoc-closure"],
+  "parserOpts": {
+    "parser": "recast"
+  },
+  "generatorOpts": {
+    "generator": "recast"
+  }
+}
diff --git a/.gitignore b/.gitignore
index c38cba70da..8bce1f63bb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /coverage/
 /dist/
 /node_modules/
+src/index.js
diff --git a/config/jsdoc/info/api-plugin.js b/config/jsdoc/info/api-plugin.js
index af732d0761..afef0dc34e 100644
--- a/config/jsdoc/info/api-plugin.js
+++ b/config/jsdoc/info/api-plugin.js
@@ -8,7 +8,7 @@ exports.defineTags = function(dictionary) {
 
   dictionary.defineTag('api', {
     onTagged: function(doclet, tag) {
-      doclet.api = tag.text || 'experimental';
+      doclet.api = true;
     }
   });
 
diff --git a/config/jsdoc/info/publish.js b/config/jsdoc/info/publish.js
index 9d9bb1cb4a..9e42a6a6d3 100644
--- a/config/jsdoc/info/publish.js
+++ b/config/jsdoc/info/publish.js
@@ -30,12 +30,12 @@ exports.publish = function(data, opts) {
         {define: {isObject: true}},
         function() {
           if (this.kind == 'class') {
-            if (!('extends' in this) || typeof this.api == 'string') {
+            if (!('extends' in this) || typeof this.api == 'boolean') {
               classes[this.longname] = this;
               return true;
             }
           }
-          return (typeof this.api == 'string' ||
+          return (typeof this.api == 'boolean' ||
               this.meta && (/[\\\/]externs$/).test(this.meta.path));
         }
       ],
@@ -53,7 +53,7 @@ exports.publish = function(data, opts) {
   docs.filter(function(doc) {
     var include = true;
     var constructor = doc.memberof;
-    if (constructor && constructor.substr(-1) === '_') {
+    if (constructor && constructor.substr(-1) === '_' && constructor.indexOf('module:') === -1) {
       assert.strictEqual(doc.inherited, true,
           'Unexpected export on private class: ' + doc.longname);
       include = false;
@@ -92,7 +92,6 @@ exports.publish = function(data, opts) {
         name: doc.longname,
         kind: doc.kind,
         description: doc.classdesc || doc.description,
-        stability: doc.api,
         path: path.join(doc.meta.path, doc.meta.filename)
       };
       if (doc.augments) {
diff --git a/config/webpack.js b/config/webpack.js
new file mode 100644
index 0000000000..370128357f
--- /dev/null
+++ b/config/webpack.js
@@ -0,0 +1,14 @@
+const webpack = require('webpack');
+const MinifyPlugin = require('babel-minify-webpack-plugin');
+
+module.exports = {
+  entry: './src/index.js',
+  output: {
+    filename: 'build/ol.js'
+  },
+  devtool: 'source-map',
+  plugins: [
+    new webpack.optimize.ModuleConcatenationPlugin(),
+    new MinifyPlugin()
+  ]
+};
diff --git a/package.json b/package.json
index 8ee21836f1..2e0f817335 100644
--- a/package.json
+++ b/package.json
@@ -9,12 +9,19 @@
   ],
   "homepage": "https://openlayers.org/",
   "scripts": {
-    "lint": "eslint tasks test src examples transforms",
-    "pretest": "npm run lint",
+    "lint": "eslint tasks test src/ol examples transforms",
+    "pretest": "npm run lint && npm run typecheck",
     "test": "npm run karma -- --single-run",
     "karma": "karma start test/karma.config.js",
     "serve-examples": "mkdir -p build/examples && webpack --config examples/webpack/config.js --watch & serve build/examples",
-    "build-examples": "webpack --config examples/webpack/config.js --env=prod"
+    "build-examples": "webpack --config examples/webpack/config.js --env=prod",
+    "build-index": "node tasks/generate-index.js",
+    "prebuild": "npm run build-index",
+    "build": "webpack --config config/webpack.js",
+    "presrc-closure": "npm run prebuild",
+    "src-closure": "babel -q --out-dir build/src-closure src/",
+    "pretypecheck": "npm run src-closure",
+    "typecheck": "node tasks/typecheck"
   },
   "main": "src/ol/index.js",
   "repository": {
@@ -36,7 +43,9 @@
   },
   "devDependencies": {
     "async": "2.6.0",
+    "babel-cli": "6.26.0",
     "babel-minify-webpack-plugin": "^0.3.0",
+    "babel-plugin-jsdoc-closure": "1.0.2",
     "clean-css-cli": "4.1.10",
     "copy-webpack-plugin": "^4.0.1",
     "coveralls": "3.0.0",
@@ -46,6 +55,7 @@
     "front-matter": "^2.1.2",
     "fs-extra": "5.0.0",
     "glob": "7.1.1",
+    "google-closure-compiler": "20180101.0.0",
     "handlebars": "4.0.11",
     "html-webpack-plugin": "^2.30.1",
     "istanbul": "0.4.5",
@@ -65,6 +75,7 @@
     "nomnom": "1.8.1",
     "pixelmatch": "^4.0.2",
     "proj4": "2.4.4",
+    "recast": "0.13.0",
     "serve": "^6.0.6",
     "sinon": "4.2.2",
     "url-polyfill": "^1.0.7",
diff --git a/src/ol.jsdoc b/src/ol.jsdoc
index 47c6db565c..2c1bf53836 100644
--- a/src/ol.jsdoc
+++ b/src/ol.jsdoc
@@ -1,3 +1,4 @@
 /**
  * @namespace ol
  */
+
diff --git a/src/ol/View.js b/src/ol/View.js
index bcca8b6a5e..22148dda1a 100644
--- a/src/ol/View.js
+++ b/src/ol/View.js
@@ -24,7 +24,8 @@ import Units from './proj/Units.js';
 
 
 /**
- * @type {number} Default min zoom level for the map view.
+ * Default min zoom level for the map view.
+ * @type {number}
  */
 const DEFAULT_MIN_ZOOM = 0;
 
diff --git a/src/ol/control/OverviewMap.js b/src/ol/control/OverviewMap.js
index 7390d01fa0..9badaa2c65 100644
--- a/src/ol/control/OverviewMap.js
+++ b/src/ol/control/OverviewMap.js
@@ -21,15 +21,17 @@ import {containsExtent, getBottomLeft, getBottomRight, getTopLeft, getTopRight,
 
 
 /**
- * @type {number} Maximum width and/or height extent ratio that determines
- * when the overview map should be zoomed out.
+ * Maximum width and/or height extent ratio that determines when the overview
+ * map should be zoomed out.
+ * @type {number}
  */
 const MAX_RATIO = 0.75;
 
 
 /**
- * @type {number} Minimum width and/or height extent ratio that determines
- * when the overview map should be zoomed in.
+ * Minimum width and/or height extent ratio that determines when the overview
+ * map should be zoomed in.
+ * @type {number}
  */
 const MIN_RATIO = 0.1;
 
diff --git a/src/ol/index.js b/src/ol/index.js
index 05efbdbefd..eaa5c3d3b8 100644
--- a/src/ol/index.js
+++ b/src/ol/index.js
@@ -1,14 +1,15 @@
 /**
- * @module ol/index
+ * @module ol
  */
 
 import webgl from './webgl.js';
 
 
 /**
+ * Include debuggable shader sources.  Default is `true`. This should be set to
+ * `false` for production builds.
  * TODO: move to a separate ol-webgl package
- * @type {boolean} Include debuggable shader sources.  Default is `true`.
- *     This should be set to `false` for production builds.
+ * @type {boolean}
  */
 export const DEBUG_WEBGL = true;
 
@@ -60,7 +61,8 @@ export {HAS_WEBGL, WEBGL_MAX_TEXTURE_SIZE, WEBGL_EXTENSIONS};
 
 
 /**
- * @type {string} OpenLayers version.
+ * OpenLayers version.
+ * @type {string}
  */
 export const VERSION = 'v4.6.4';
 
diff --git a/src/ol/interaction/MouseWheelZoom.js b/src/ol/interaction/MouseWheelZoom.js
index e023c41a9f..43f404f6b3 100644
--- a/src/ol/interaction/MouseWheelZoom.js
+++ b/src/ol/interaction/MouseWheelZoom.js
@@ -12,7 +12,8 @@ import {clamp} from '../math.js';
 
 
 /**
- * @type {number} Maximum mouse wheel delta.
+ * Maximum mouse wheel delta.
+ * @type {number}
  */
 const MAX_DELTA = 1;
 
diff --git a/src/ol/renderer/vector.js b/src/ol/renderer/vector.js
index 70a2d767ee..188889e506 100644
--- a/src/ol/renderer/vector.js
+++ b/src/ol/renderer/vector.js
@@ -9,7 +9,8 @@ const _ol_renderer_vector_ = {};
 
 
 /**
- * @type {number} Tolerance for geometry simplification in device pixels.
+ * Tolerance for geometry simplification in device pixels.
+ * @type {number}
  */
 const SIMPLIFY_TOLERANCE = 0.5;
 
diff --git a/src/ol/renderer/webgl/Map.js b/src/ol/renderer/webgl/Map.js
index c3c75140b4..d3aefcb158 100644
--- a/src/ol/renderer/webgl/Map.js
+++ b/src/ol/renderer/webgl/Map.js
@@ -23,7 +23,8 @@ import ContextEventType from '../../webgl/ContextEventType.js';
 
 
 /**
- * @type {number} Texture cache high water mark.
+ * Texture cache high water mark.
+ * @type {number}
  */
 const WEBGL_TEXTURE_CACHE_HIGH_WATER_MARK = 1024;
 
diff --git a/src/ol/reproj/Triangulation.js b/src/ol/reproj/Triangulation.js
index 702c092c46..6216cd1689 100644
--- a/src/ol/reproj/Triangulation.js
+++ b/src/ol/reproj/Triangulation.js
@@ -8,23 +8,22 @@ import {getTransform} from '../proj.js';
 
 
 /**
- * @type {number} Maximum number of subdivision steps during raster
- *     reprojection triangulation. Prevents high memory usage and large
- *     number of proj4 calls (for certain transformations and areas).
- *     At most `2*(2^this)` triangles are created for each triangulated
- *     extent (tile/image).
+ * Maximum number of subdivision steps during raster reprojection triangulation.
+ * Prevents high memory usage and large number of proj4 calls (for certain
+ * transformations and areas). At most `2*(2^this)` triangles are created for
+ * each triangulated extent (tile/image).
+ * @type {number}
  */
 const MAX_SUBDIVISION = 10;
 
 
 /**
- * @type {number} Maximum allowed size of triangle relative to world width.
- *     When transforming corners of world extent between certain projections,
- *     the resulting triangulation seems to have zero error and no subdivision
- *     is performed.
- *     If the triangle width is more than this (relative to world width; 0-1),
- *     subdivison is forced (up to `MAX_SUBDIVISION`).
- *     Default is `0.25`.
+ * Maximum allowed size of triangle relative to world width. When transforming
+ * corners of world extent between certain projections, the resulting
+ * triangulation seems to have zero error and no subdivision is performed. If
+ * the triangle width is more than this (relative to world width; 0-1),
+ * subdivison is forced (up to `MAX_SUBDIVISION`). Default is `0.25`.
+ * @type {number}
  */
 const MAX_TRIANGLE_WIDTH = 0.25;
 
diff --git a/src/ol/reproj/common.js b/src/ol/reproj/common.js
index 6b28ebfe6b..f74827bfe0 100644
--- a/src/ol/reproj/common.js
+++ b/src/ol/reproj/common.js
@@ -1,12 +1,13 @@
 /**
- * @type {number} Default maximum allowed threshold  (in pixels) for
- *     reprojection triangulation.
+ * Default maximum allowed threshold  (in pixels) for reprojection
+ * triangulation.
+ * @type {number}
  */
 export const ERROR_THRESHOLD = 0.5;
 
 /**
+ * Enable automatic reprojection of raster sources. Default is `true`.
  * TODO: decide if we want to expose this as a build flag or remove it
- * @type {boolean} Enable automatic reprojection of raster sources. Default is
- *     `true`.
+ * @type {boolean}
  */
 export const ENABLE_RASTER_REPROJECTION = true;
diff --git a/src/ol/source/Raster.js b/src/ol/source/Raster.js
index bf28ff180f..b1133aaa39 100644
--- a/src/ol/source/Raster.js
+++ b/src/ol/source/Raster.js
@@ -8,7 +8,7 @@ import {createCanvasContext2D} from '../dom.js';
 import {listen} from '../events.js';
 import Event from '../events/Event.js';
 import EventType from '../events/EventType.js';
-import {Processor} from 'pixelworks';
+import {Processor} from 'pixelworks/lib/index';
 import {equals, getCenter, getHeight, getWidth} from '../extent.js';
 import ImageLayer from '../layer/Image.js';
 import TileLayer from '../layer/Tile.js';
diff --git a/src/ol/source/common.js b/src/ol/source/common.js
index 373726a379..9e3f04c681 100644
--- a/src/ol/source/common.js
+++ b/src/ol/source/common.js
@@ -1,4 +1,5 @@
 /**
- * @type {string} Default WMS version.
+ * Default WMS version.
+ * @type {string}
  */
 export const DEFAULT_WMS_VERSION = '1.3.0';
diff --git a/src/ol/sphere.js b/src/ol/sphere.js
index fcb923bba2..48af84e903 100644
--- a/src/ol/sphere.js
+++ b/src/ol/sphere.js
@@ -6,7 +6,7 @@
 */
 
 /**
- * @module ol/Sphere
+ * @module ol/sphere
  */
 import {toRadians, toDegrees} from './math.js';
 import GeometryType from './geom/GeometryType.js';
diff --git a/src/ol/style/AtlasManager.js b/src/ol/style/AtlasManager.js
index 8bd2b80b08..81df116720 100644
--- a/src/ol/style/AtlasManager.js
+++ b/src/ol/style/AtlasManager.js
@@ -6,12 +6,14 @@ import Atlas from '../style/Atlas.js';
 
 
 /**
- * @type {number} The size in pixels of the first atlas image.
+ * The size in pixels of the first atlas image.
+ * @type {number}
  */
 const INITIAL_ATLAS_SIZE = 256;
 
 /**
- * @type {number} The maximum size in pixels of atlas images.
+ * The maximum size in pixels of atlas images.
+ * @type {number}
  */
 const MAX_ATLAS_SIZE = -1;
 
diff --git a/src/ol/tilegrid/common.js b/src/ol/tilegrid/common.js
index b43e79676f..57a19b76ad 100644
--- a/src/ol/tilegrid/common.js
+++ b/src/ol/tilegrid/common.js
@@ -1,9 +1,11 @@
 /**
- * @type {number} Default maximum zoom for default tile grids.
+ * Default maximum zoom for default tile grids.
+ * @type {number}
  */
 export const DEFAULT_MAX_ZOOM = 42;
 
 /**
- * @type {number} Default tile size.
+ * Default tile size.
+ * @type {number}
  */
 export const DEFAULT_TILE_SIZE = 256;
diff --git a/src/ol/typedefs.js b/src/ol/typedefs.js
index 01115f37da..ae88f335a9 100644
--- a/src/ol/typedefs.js
+++ b/src/ol/typedefs.js
@@ -2,7 +2,8 @@
  * @module ol/typedefs
  */
 
-/* global ol:false */
+//FIXME Remove when reworking typedefs, export typedefs as variables instead
+const ol = {};
 
 /**
  * File for all typedefs used by the compiler, and referenced by JSDoc.
diff --git a/tasks/generate-index.js b/tasks/generate-index.js
new file mode 100644
index 0000000000..dc02268697
--- /dev/null
+++ b/tasks/generate-index.js
@@ -0,0 +1,157 @@
+const fs = require('fs-extra');
+const path = require('path');
+const async = require('async');
+const generateInfo = require('./generate-info');
+
+
+/**
+ * Read the symbols from info file.
+ * @param {function(Error, Array.<string>, Array.<Object>)} callback Called
+ *     with the patterns and symbols (or any error).
+ */
+function getSymbols(callback) {
+  generateInfo(function(err) {
+    if (err) {
+      callback(new Error('Trouble generating info: ' + err.message));
+      return;
+    }
+    const symbols = require('../build/info.json').symbols;
+    callback(null, symbols.filter(symbol => symbol.kind != 'member'));
+  });
+}
+
+function getPath(name) {
+  const fullPath = require.resolve(path.resolve('src', name));
+  return './' + path.posix.relative('src/', fullPath);
+}
+
+/**
+ * Generate a list of symbol names.
+ *
+ * @param {Array.<Object>} symbols List of symbols.
+ * @param {function(Error, Array.<Object>, Array.<string>)} callback Called with
+ *     the filtered list of symbols and a list of all provides (or any error).
+ */
+function addImports(symbols, callback) {
+  const imports = {};
+  symbols.forEach(function(symbol) {
+    const defaultExport = symbol.name.split('~');
+    const namedExport = symbol.name.split('.');
+    if (defaultExport.length > 1) {
+      const from = defaultExport[0].replace(/^module\:/, './');
+      const importName = from.replace(/[.\/]+/g, '$');
+      const defaultImport = `import ${importName} from '${getPath(from)}';`;
+      imports[defaultImport] = true;
+    } else if (namedExport.length > 1) {
+      const from = namedExport[0].replace(/^module\:/, './');
+      const importName = from.replace(/[.\/]+/g, '_');
+      const namedImport = `import * as ${importName} from '${getPath(from)}';`;
+      imports[namedImport] = true;
+    }
+  });
+
+  callback(null, symbols, Object.keys(imports).sort());
+}
+
+
+/**
+ * Generate code to export a named symbol.
+ * @param {string} name Symbol name.
+ * @param {Object.<string, string>} namespaces Already defined namespaces.
+ * @return {string} Export code.
+ */
+function formatSymbolExport(name, namespaces) {
+  const parts = name.split('~');
+  const isNamed = parts[0].indexOf('.') !== -1;
+  const nsParts = parts[0].replace(/^module\:/, '').split(/[\/\.]/);
+  const last = nsParts.length - 1;
+  const importName = isNamed ?
+    '_' + nsParts.slice(0, last).join('_') + '.' + nsParts[last] :
+    '$' + nsParts.join('$');
+  let line = nsParts[0];
+  for (let i = 1, ii = nsParts.length; i < ii; ++i) {
+    line += `.${nsParts[i]}`;
+    namespaces[line] = (line in namespaces ? namespaces[line] : true) && i < ii - 1;
+  }
+  line += ` = ${importName};`;
+  return line;
+}
+
+
+/**
+ * Generate export code given a list symbol names.
+ * @param {Array.<Object>} symbols List of symbols.
+ * @param {Object.<string, string>} namespaces Already defined namespaces.
+ * @param {Array.<string>} imports List of all imports.
+ * @return {string} Export code.
+ */
+function generateExports(symbols, namespaces, imports) {
+  let blocks = [];
+  symbols.forEach(function(symbol) {
+    const name = symbol.name;
+    if (name.indexOf('#') == -1) {
+      const block = formatSymbolExport(name, namespaces);
+      if (block !== blocks[blocks.length - 1]) {
+        blocks.push(block);
+      }
+    }
+  });
+  const nsdefs = ['const ol = window[\'ol\'] = {};'];
+  const ns = Object.keys(namespaces).sort();
+  for (let i = 0, ii = ns.length; i < ii; ++i) {
+    if (namespaces[ns[i]]) {
+      nsdefs.push(`${ns[i]} = {};`);
+    }
+  }
+  blocks = imports.concat(nsdefs).concat(blocks);
+  blocks.push('');
+  return blocks.join('\n');
+}
+
+
+/**
+ * Generate the exports code.
+ *
+ * @param {function(Error, string)} callback Called with the exports code or any
+ *     error generating it.
+ */
+function main(callback) {
+  async.waterfall([
+    getSymbols,
+    addImports,
+    function(symbols, imports, done) {
+      let code, err;
+      try {
+        code = generateExports(symbols, {}, imports);
+      } catch (e) {
+        err = e;
+      }
+      done(err, code);
+    }
+  ], callback);
+}
+
+
+/**
+ * If running this module directly, read the config file, call the main
+ * function, and write the output file.
+ */
+if (require.main === module) {
+  async.waterfall([
+    main,
+    fs.outputFile.bind(fs, path.resolve('src', 'index.js'))
+  ], function(err) {
+    if (err) {
+      process.stderr.write(err.message + '\n');
+      process.exit(1);
+    } else {
+      process.exit(0);
+    }
+  });
+}
+
+
+/**
+ * Export main function.
+ */
+module.exports = main;
diff --git a/tasks/generate-info.js b/tasks/generate-info.js
index 089f203415..ba328d9b6d 100644
--- a/tasks/generate-info.js
+++ b/tasks/generate-info.js
@@ -208,62 +208,6 @@ function spawnJSDoc(paths, callback) {
 }
 
 
-/**
- * Given the path to a source file, get the list of provides.
- * @param {string} srcPath Path to source file.
- * @param {function(Error, Array.<string>)} callback Called with a list of
- *     provides or any error.
- */
-const getProvides = async.memoize(function(srcPath, callback) {
-  fs.readFile(srcPath, function(err, data) {
-    if (err) {
-      callback(err);
-      return;
-    }
-    const provides = [];
-    const matcher = /goog\.provide\('(.*)'\)/;
-    String(data).split('\n').forEach(function(line) {
-      const match = line.match(matcher);
-      if (match) {
-        provides.push(match[1]);
-      }
-    });
-    callback(null, provides);
-  });
-});
-
-
-/**
- * Add provides data to new symbols.
- * @param {Object} info Symbols and defines metadata.
- * @param {function(Error, Object)} callback Updated metadata.
- */
-function addSymbolProvides(info, callback) {
-  if (!info) {
-    process.nextTick(function() {
-      callback(null, null);
-    });
-    return;
-  }
-
-  function addProvides(symbol, callback) {
-    getProvides(symbol.path, function(err, provides) {
-      if (err) {
-        callback(err);
-        return;
-      }
-      symbol.provides = provides;
-      callback(null, symbol);
-    });
-  }
-
-  async.map(info.symbols, addProvides, function(err, newSymbols) {
-    info.symbols = newSymbols;
-    callback(err, info);
-  });
-}
-
-
 /**
  * Write symbol and define metadata to the info file.
  * @param {Object} info Symbol and define metadata.
@@ -294,7 +238,6 @@ function main(callback) {
     getNewerExterns,
     getNewer,
     spawnJSDoc,
-    addSymbolProvides,
     writeInfo
   ], callback);
 }
diff --git a/tasks/typecheck.js b/tasks/typecheck.js
new file mode 100644
index 0000000000..9c4632ec41
--- /dev/null
+++ b/tasks/typecheck.js
@@ -0,0 +1,28 @@
+const Compiler = require('google-closure-compiler').compiler;
+
+const compiler = new Compiler({
+  js: [
+    './build/src-closure/**.js',
+    './node_modules/pbf/package.json', './node_modules/pbf/**.js', './node_modules/ieee754/**.js',
+    './node_modules/pixelworks/package.json', './node_modules/pixelworks/**.js',
+    './node_modules/rbush/package.json', './node_modules/rbush/**.js', 'node_modules/quickselect/**.js'
+  ],
+  entry_point: './build/src-closure/index.js',
+  module_resolution: 'NODE',
+  dependency_mode: 'STRICT',
+  process_common_js_modules: true,
+  checks_only: true,
+  //FIXME Change newCheckTypes to jscomp_error when we have path types everywhere
+  jscomp_warning: ['newCheckTypes'],
+  // Options to make dependencies work
+  hide_warnings_for: 'node_modules'
+});
+
+compiler.run((exit, out, err) => {
+  if (exit) {
+    process.stderr.write(err, () => process.exit(exit));
+  } else {
+    process.stderr.write(err);
+    process.stdout.write(out);
+  }
+});