Refactor BlobCiYamlSelector and BlobCiYamlSelectors to ES6.

(Removes opts destructuring and inheritance boilerplate)

app/assets/javascripts/blob/blob_ci_yaml.js

-
-/*= require blob/template_selector */
-
-(function() {
-  var extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
-    hasProp = {}.hasOwnProperty;
-
-  this.BlobCiYamlSelector = (function(superClass) {
-    extend(BlobCiYamlSelector, superClass);
-
-    function BlobCiYamlSelector() {
-      return BlobCiYamlSelector.__super__.constructor.apply(this, arguments);
-    }
-
-    BlobCiYamlSelector.prototype.requestFile = function(query) {
-      return Api.gitlabCiYml(query.name, this.requestFileSuccess.bind(this));
-    };
-
-    return BlobCiYamlSelector;
-
-  })(TemplateSelector);
-
-  this.BlobCiYamlSelectors = (function() {
-    function BlobCiYamlSelectors(opts) {
-      var ref;
-      this.$dropdowns = (ref = opts.$dropdowns) != null ? ref : $('.js-gitlab-ci-yml-selector'), this.editor = opts.editor;
-      this.$dropdowns.each((function(_this) {
-        return function(i, dropdown) {
-          var $dropdown;
-          $dropdown = $(dropdown);
-          return new BlobCiYamlSelector({
-            pattern: /(.gitlab-ci.yml)/,
-            data: $dropdown.data('data'),
-            wrapper: $dropdown.closest('.js-gitlab-ci-yml-selector-wrap'),
-            dropdown: $dropdown,
-            editor: _this.editor
-          });
-        };
-      })(this));
-    }
-
-    return BlobCiYamlSelectors;
-
-  })();
-
-}).call(this);

app/assets/javascripts/blob/blob_ci_yaml.js.es6

+/*= require blob/template_selector */
+
+class BlobCiYamlSelector extends TemplateSelector {
+  constructor(...args) {
+    super(...args);
+  }
+
+  requestFile(query) {
+    return Api.gitlabCiYml(query.name, this.requestFileSuccess.bind(this));
+  };
+};
+
+class BlobCiYamlSelectors {
+  constructor(opts) {
+    this.$dropdowns = opts.$dropdowns || $('.js-gitlab-ci-yml-selector');
+    this.editor = opts.editor;
+    this.initSelectors();
+  }
+
+  initSelectors() {
+    this.$dropdowns.each((i, dropdown) => {
+      const $dropdown = $(dropdown);
+      return new BlobCiYamlSelector({
+        pattern: /(.gitlab-ci.yml)/,
+        data: $dropdown.data('data'),
+        wrapper: $dropdown.closest('.js-gitlab-ci-yml-selector-wrap'),
+        dropdown: $dropdown,
+        editor: this.editor
+      });
+    });
+  }
+}