Make code prettier

This updates ESLint and our shared eslint-config-openlayers to use Prettier.  Most formatting changes were automatically applied with this:

    npm run lint -- --fix

A few manual changes were required:

 * In `examples/offscreen-canvas.js`, the `//eslint-disable-line` comment needed to be moved to the appropriate line to disable the error about the `'worker-loader!./offscreen-canvas.worker.js'` import.
 * In `examples/webpack/exapmle-builder.js`, spaces could not be added after a couple `function`s for some reason.  While editing this, I reworked `ExampleBuilder` to be a class.
 * In `src/ol/format/WMSGetFeatureInfo.js`, the `// @ts-ignore` comment needed to be moved down one line so it applied to the `parsersNS` argument.

src/ol/source/Source.js

@@ -1,11 +1,10 @@
 /**
  * @module ol/source/Source
  */
-import {abstract} from '../util.js';
 import BaseObject from '../Object.js';
-import {get as getProjection} from '../proj.js';
 import SourceState from './State.js';
-
+import {abstract} from '../util.js';
+import {get as getProjection} from '../proj.js';
 
 /**
  * A function that returns a string or an array of strings representing source
@@ -14,7 +13,6 @@ import SourceState from './State.js';
  * @typedef {function(import("../PluggableMap.js").FrameState): (string|Array<string>)} Attribution
  */
 
-
 /**
  * A type that can be used to provide attribution information for data sources.
  *
@@ -26,7 +24,6 @@ import SourceState from './State.js';
  * @typedef {string|Array<string>|Attribution} AttributionLike
  */
 
-
 /**
  * @typedef {Object} Options
  * @property {AttributionLike} [attributions]
@@ -36,7 +33,6 @@ import SourceState from './State.js';
  * @property {boolean} [wrapX=false]
  */
 
-
 /**
  * @classdesc
  * Abstract base class; normally only used for creating subclasses and not
@@ -52,7 +48,6 @@ class Source extends BaseObject {
    * @param {Options} options Source options.
    */
   constructor(options) {
-
     super();
 
     /**
@@ -71,8 +66,10 @@ class Source extends BaseObject {
      * @private
      * @type {boolean}
      */
-    this.attributionsCollapsible_ = options.attributionsCollapsible !== undefined ?
-      options.attributionsCollapsible : true;
+    this.attributionsCollapsible_ =
+      options.attributionsCollapsible !== undefined
+        ? options.attributionsCollapsible
+        : true;
 
     /**
      * This source is currently loading data. Sources that defer loading to the
@@ -85,15 +82,14 @@ class Source extends BaseObject {
      * @private
      * @type {SourceState}
      */
-    this.state_ = options.state !== undefined ?
-      options.state : SourceState.READY;
+    this.state_ =
+      options.state !== undefined ? options.state : SourceState.READY;
 
     /**
      * @private
      * @type {boolean}
      */
     this.wrapX_ = options.wrapX !== undefined ? options.wrapX : false;
-
   }
 
   /**
@@ -175,7 +171,6 @@ class Source extends BaseObject {
   }
 }
 
-
 /**
  * Turns the attributions option into an attributions function.
  * @param {AttributionLike|undefined} attributionLike The attribution option.
@@ -186,7 +181,7 @@ function adaptAttributions(attributionLike) {
     return null;
   }
   if (Array.isArray(attributionLike)) {
-    return function(frameState) {
+    return function (frameState) {
       return attributionLike;
     };
   }
@@ -195,10 +190,9 @@ function adaptAttributions(attributionLike) {
     return attributionLike;
   }
 
-  return function(frameState) {
+  return function (frameState) {
     return [attributionLike];
   };
 }
 
-
 export default Source;