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.

config/jsdoc/api/plugins/markdown.js

@@ -19,7 +19,7 @@ const tags = [
   'properties',
   'returns',
   'see',
-  'summary'
+  'summary',
 ];
 
 const hasOwnProp = Object.prototype.hasOwnProperty;
@@ -27,32 +27,32 @@ const hasOwnProp = Object.prototype.hasOwnProperty;
 const markedRenderer = new marked.Renderer();
 
 // Allow prettyprint to work on inline code samples
-markedRenderer.code = function(code, language) {
+markedRenderer.code = function (code, language) {
   const langClass = language ? ' lang-' + language : '';
 
-  return format('<pre class="prettyprint source%s"><code>%s</code></pre>',
-    langClass, escapeCode(code));
+  return format(
+    '<pre class="prettyprint source%s"><code>%s</code></pre>',
+    langClass,
+    escapeCode(code)
+  );
 };
 
 function escapeCode(source) {
-  return source.replace(/</g, '&lt;')
+  return source
+    .replace(/</g, '&lt;')
     .replace(/"/g, '&quot;')
     .replace(/'/g, '&#39;');
 }
 
 function escapeUnderscoresAndTildes(source) {
-  return source.replace(/\{@[^}\r\n]+\}/g, function(wholeMatch) {
-    return wholeMatch
-      .replace(/(^|[^\\])_/g, '$1\\_')
-      .replace('~', '&tilde;');
+  return source.replace(/\{@[^}\r\n]+\}/g, function (wholeMatch) {
+    return wholeMatch.replace(/(^|[^\\])_/g, '$1\\_').replace('~', '&tilde;');
   });
 }
 
 function unencodeQuotesAndTildes(source) {
-  return source.replace(/\{@[^}\r\n]+\}/g, function(wholeMatch) {
-    return wholeMatch
-      .replace(/&quot;/g, '"')
-      .replace(/&tilde;/g, '~');
+  return source.replace(/\{@[^}\r\n]+\}/g, function (wholeMatch) {
+    return wholeMatch.replace(/&quot;/g, '"').replace(/&tilde;/g, '~');
   });
 }
 
@@ -63,7 +63,7 @@ function parse(source) {
 
   result = marked(source, {renderer: markedRenderer})
     .replace(/\s+$/, '')
-    .replace(/&#39;/g, '\'');
+    .replace(/&#39;/g, "'");
 
   result = unencodeQuotesAndTildes(result);
 
@@ -82,15 +82,18 @@ function shouldProcessString(tagName, text) {
 }
 
 function process(doclet) {
-  tags.forEach(function(tag) {
+  tags.forEach(function (tag) {
     if (!hasOwnProp.call(doclet, tag)) {
       return;
     }
 
-    if (typeof doclet[tag] === 'string' && shouldProcessString(tag, doclet[tag])) {
+    if (
+      typeof doclet[tag] === 'string' &&
+      shouldProcessString(tag, doclet[tag])
+    ) {
       doclet[tag] = parse(doclet[tag]);
     } else if (Array.isArray(doclet[tag])) {
-      doclet[tag].forEach(function(value, index, original) {
+      doclet[tag].forEach(function (value, index, original) {
         const inner = {};
 
         inner[tag] = value;
@@ -103,9 +106,8 @@ function process(doclet) {
   });
 }
 
-
 exports.handlers = {
-  newDoclet: function(e) {
+  newDoclet: function (e) {
     process(e.doclet);
-  }
+  },
 };