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.

test/spec/ol/observable.test.js

@@ -1,27 +1,23 @@
 import EventTarget from '../../../src/ol/events/Target.js';
 import Observable, {unByKey} from '../../../src/ol/Observable.js';
 
-
-describe('ol.Observable', function() {
-
-  describe('constructor', function() {
-
-    it('creates a new observable', function() {
+describe('ol.Observable', function () {
+  describe('constructor', function () {
+    it('creates a new observable', function () {
       const observable = new Observable();
       expect(observable).to.be.a(Observable);
       expect(observable).to.be.a(EventTarget);
     });
-
   });
 
-  describe('#on()', function() {
+  describe('#on()', function () {
     let observable, listener;
-    beforeEach(function() {
+    beforeEach(function () {
       observable = new Observable();
       listener = sinon.spy();
     });
 
-    it('registers a listener for events of the given type', function() {
+    it('registers a listener for events of the given type', function () {
       observable.on('foo', listener);
 
       observable.dispatchEvent('foo');
@@ -31,7 +27,7 @@ describe('ol.Observable', function() {
       expect(listener.callCount).to.be(2);
     });
 
-    it('accepts an array of event types', function() {
+    it('accepts an array of event types', function () {
       observable.on(['foo', 'bar'], listener);
 
       observable.dispatchEvent('foo');
@@ -41,22 +37,21 @@ describe('ol.Observable', function() {
       expect(listener.callCount).to.be(2);
     });
 
-    it('returns a listener key', function() {
+    it('returns a listener key', function () {
       const key = observable.on('foo', listener);
 
       expect(typeof key).to.be('object');
     });
-
   });
 
-  describe('#once()', function() {
+  describe('#once()', function () {
     let observable, listener;
-    beforeEach(function() {
+    beforeEach(function () {
       observable = new Observable();
       listener = sinon.spy();
     });
 
-    it('registers a listener that is only called once', function() {
+    it('registers a listener that is only called once', function () {
       observable.once('foo', listener);
 
       observable.dispatchEvent('foo');
@@ -66,22 +61,22 @@ describe('ol.Observable', function() {
       expect(listener.callCount).to.be(1);
     });
 
-    it('is safe to dispatch events of same type in a once listener', function() {
+    it('is safe to dispatch events of same type in a once listener', function () {
       let callCount = 0;
-      observable.once('change', function() {
+      observable.once('change', function () {
         observable.changed();
         observable.changed();
       });
-      observable.on('change', function() {
+      observable.on('change', function () {
         ++callCount;
       });
-      expect(function() {
+      expect(function () {
         observable.changed();
       }).to.not.throwException();
       expect(callCount).to.be(3);
     });
 
-    it('accepts an array of event types (called once for each)', function() {
+    it('accepts an array of event types (called once for each)', function () {
       observable.once(['foo', 'bar'], listener);
 
       observable.dispatchEvent('foo');
@@ -97,22 +92,21 @@ describe('ol.Observable', function() {
       expect(listener.callCount).to.be(2);
     });
 
-    it('returns a listener key', function() {
+    it('returns a listener key', function () {
       const key = observable.once('foo', listener);
 
       expect(typeof key).to.be('object');
     });
-
   });
 
-  describe('#un()', function() {
+  describe('#un()', function () {
     let observable, listener;
-    beforeEach(function() {
+    beforeEach(function () {
       observable = new Observable();
       listener = sinon.spy();
     });
 
-    it('unregisters a previously registered listener', function() {
+    it('unregisters a previously registered listener', function () {
       observable.on('foo', listener);
 
       observable.dispatchEvent('foo');
@@ -122,17 +116,16 @@ describe('ol.Observable', function() {
       observable.dispatchEvent('foo');
       expect(listener.calledOnce).to.be(true);
     });
-
   });
 
-  describe('ol.Observable.unByKey()', function() {
+  describe('ol.Observable.unByKey()', function () {
     let observable, listener;
-    beforeEach(function() {
+    beforeEach(function () {
       observable = new Observable();
       listener = sinon.spy();
     });
 
-    it('unregisters a listener given the key returned by `on`', function() {
+    it('unregisters a listener given the key returned by `on`', function () {
       const key = observable.on('foo', listener);
 
       observable.dispatchEvent('foo');
@@ -142,7 +135,5 @@ describe('ol.Observable', function() {
       observable.dispatchEvent('foo');
       expect(listener.callCount).to.be(1);
     });
-
   });
-
 });