Properly scope BlobCiYamlSelector and BlobCiYamlSelectors.

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

 /*= require blob/template_selector */
+((global) => {
 
-class BlobCiYamlSelector extends TemplateSelector {
+  class BlobCiYamlSelector extends TemplateSelector {
     constructor(...args) {
       super(...args);
     }
@@ -8,9 +9,11 @@ class BlobCiYamlSelector extends TemplateSelector {
     requestFile(query) {
       return Api.gitlabCiYml(query.name, this.requestFileSuccess.bind(this));
     };
-};
+  };
+
+  global.BlobCiYamlSelector = BlobCiYamlSelector;
 
-class BlobCiYamlSelectors {
+  class BlobCiYamlSelectors {
     constructor(opts) {
       this.$dropdowns = opts.$dropdowns || $('.js-gitlab-ci-yml-selector');
       this.editor = opts.editor;
@@ -29,4 +32,8 @@ class BlobCiYamlSelectors {
         });
       });
     }
-}
+  }
+
+  global.BlobCiYamlSelectors = BlobCiYamlSelectors;
+
+})(window.gl || (window.gl = {}));

app/assets/javascripts/blob_edit/edit_blob.js

@@ -29,7 +29,7 @@
       new BlobGitignoreSelectors({
         editor: this.editor
       });
-      new BlobCiYamlSelectors({
+      new gl.BlobCiYamlSelectors({
         editor: this.editor
       });
     }