refactor instances of CJS module.exports to ES module syntax

app/assets/javascripts/cycle_analytics/cycle_analytics_bundle.js

@@ -14,7 +14,6 @@ import './components/stage_test_component';
 import './components/total_time_component';
 import './cycle_analytics_service';
 import './cycle_analytics_store';
-import './default_event_objects';
 Vue.use(Translate);

app/assets/javascripts/cycle_analytics/default_event_objects.js

-module.exports = {
+export default {
   issue: {
     created_at: '',
     url: '',

app/assets/javascripts/lib/utils/http_status.js

@@ -2,9 +2,7 @@
  * exports HTTP status codes
  */
-const statusCodes = {
+export default {
   NO_CONTENT: 204,
   OK: 200,
 };
-
-module.exports = statusCodes;

app/assets/javascripts/shortcuts_blob.js

@@ -8,7 +8,7 @@ const defaults = {
   fileBlobPermalinkUrl: null,
 };
-class ShortcutsBlob extends Shortcuts {
+export default class ShortcutsBlob extends Shortcuts {
   constructor(opts) {
     const options = Object.assign({}, defaults, opts);
     super(options.skipResetBindings);
@@ -25,5 +25,3 @@ class ShortcutsBlob extends Shortcuts {
     }
   }
 }
-
-module.exports = ShortcutsBlob;

app/assets/javascripts/version_check_image.js

-class VersionCheckImage {
+export default class VersionCheckImage {
   static bindErrorEvent(imageElement) {
     imageElement.off('error').on('error', () => imageElement.hide());
   }
@@ -6,5 +6,3 @@ class VersionCheckImage {
 window.gl = window.gl || {};
 gl.VersionCheckImage = VersionCheckImage;
-
-module.exports = VersionCheckImage;

spec/javascripts/helpers/class_spec_helper.js

-class ClassSpecHelper {
+export default class ClassSpecHelper {
   static itShouldBeAStaticMethod(base, method) {
     return it('should be a static method', () => {
       expect(Object.prototype.hasOwnProperty.call(base, method)).toBeTruthy();
@@ -7,5 +7,3 @@ class ClassSpecHelper {
 }
 window.ClassSpecHelper = ClassSpecHelper;
-
-module.exports = ClassSpecHelper;

spec/javascripts/helpers/filtered_search_spec_helper.js

-class FilteredSearchSpecHelper {
+export default class FilteredSearchSpecHelper {
   static createFilterVisualTokenHTML(name, value, isSelected) {
     return FilteredSearchSpecHelper.createFilterVisualToken(name, value, isSelected).outerHTML;
   }
@@ -53,5 +53,3 @@ class FilteredSearchSpecHelper {
     `;
   }
 }
-
-module.exports = FilteredSearchSpecHelper;