Chore(deprecatedCreateFlash): remove function

Since the function is no longer used we can safely
remove it + the tests covering it

app/assets/javascripts/flash.js

@@ -125,34 +125,8 @@ const createFlash = function createFlash({
   return flashContainer;
 };
 
-/*
- *  Flash banner supports different types of Flash configurations
- *  along with ability to provide actionConfig which can be used to show
- *  additional action or link on banner next to message
- *
- *  @param {String} message           Flash message text
- *  @param {String} type              Type of Flash, it can be `notice`, `success`, `warning` or `alert` (default)
- *  @param {Object} parent            Reference to parent element under which Flash needs to appear
- *  @param {Object} actionConfig      Map of config to show action on banner
- *    @param {String} href            URL to which action config should point to (default: '#')
- *    @param {String} title           Title of action
- *    @param {Function} clickHandler  Method to call when action is clicked on
- *  @param {Boolean} fadeTransition   Boolean to determine whether to fade the alert out
- */
-const deprecatedCreateFlash = function deprecatedCreateFlash(
-  message,
-  type,
-  parent,
-  actionConfig,
-  fadeTransition,
-  addBodyClass,
-) {
-  return createFlash({ message, type, parent, actionConfig, fadeTransition, addBodyClass });
-};
-
 export {
   createFlash as default,
-  deprecatedCreateFlash,
   createFlashEl,
   createAction,
   hideFlash,

spec/frontend/flash_spec.js

 import createFlash, {
-  deprecatedCreateFlash,
   createFlashEl,
   createAction,
   hideFlash,
@@ -125,120 +124,6 @@ describe('Flash', () => {
     });
   });
 
-  describe('deprecatedCreateFlash', () => {
-    const message = 'test';
-    const type = 'alert';
-    const parent = document;
-    const actionConfig = null;
-    const fadeTransition = false;
-    const addBodyClass = true;
-    const defaultParams = [message, type, parent, actionConfig, fadeTransition, addBodyClass];
-
-    describe('no flash-container', () => {
-      it('does not add to the DOM', () => {
-        const flashEl = deprecatedCreateFlash(message);
-
-        expect(flashEl).toBeNull();
-
-        expect(document.querySelector('.flash-alert')).toBeNull();
-      });
-    });
-
-    describe('with flash-container', () => {
-      beforeEach(() => {
-        setFixtures(
-          '<div class="content-wrapper js-content-wrapper"><div class="flash-container"></div></div>',
-        );
-      });
-
-      afterEach(() => {
-        document.querySelector('.js-content-wrapper').remove();
-      });
-
-      it('adds flash element into container', () => {
-        deprecatedCreateFlash(...defaultParams);
-
-        expect(document.querySelector('.flash-alert')).not.toBeNull();
-
-        expect(document.body.className).toContain('flash-shown');
-      });
-
-      it('adds flash into specified parent', () => {
-        deprecatedCreateFlash(
-          message,
-          type,
-          document.querySelector('.content-wrapper'),
-          actionConfig,
-          fadeTransition,
-          addBodyClass,
-        );
-
-        expect(document.querySelector('.content-wrapper .flash-alert')).not.toBeNull();
-        expect(document.querySelector('.content-wrapper').innerText.trim()).toEqual(message);
-      });
-
-      it('adds container classes when inside content-wrapper', () => {
-        deprecatedCreateFlash(...defaultParams);
-
-        expect(document.querySelector('.flash-text').className).toBe('flash-text');
-        expect(document.querySelector('.content-wrapper').innerText.trim()).toEqual(message);
-      });
-
-      it('does not add container when outside of content-wrapper', () => {
-        document.querySelector('.content-wrapper').className = 'js-content-wrapper';
-        deprecatedCreateFlash(...defaultParams);
-
-        expect(document.querySelector('.flash-text').className.trim()).toContain('flash-text');
-      });
-
-      it('removes element after clicking', () => {
-        deprecatedCreateFlash(...defaultParams);
-
-        document.querySelector('.flash-alert .js-close-icon').click();
-
-        expect(document.querySelector('.flash-alert')).toBeNull();
-
-        expect(document.body.className).not.toContain('flash-shown');
-      });
-
-      describe('with actionConfig', () => {
-        it('adds action link', () => {
-          const newActionConfig = { title: 'test' };
-          deprecatedCreateFlash(
-            message,
-            type,
-            parent,
-            newActionConfig,
-            fadeTransition,
-            addBodyClass,
-          );
-
-          expect(document.querySelector('.flash-action')).not.toBeNull();
-        });
-
-        it('calls actionConfig clickHandler on click', () => {
-          const newActionConfig = {
-            title: 'test',
-            clickHandler: jest.fn(),
-          };
-
-          deprecatedCreateFlash(
-            message,
-            type,
-            parent,
-            newActionConfig,
-            fadeTransition,
-            addBodyClass,
-          );
-
-          document.querySelector('.flash-action').click();
-
-          expect(newActionConfig.clickHandler).toHaveBeenCalled();
-        });
-      });
-    });
-  });
-
   describe('createFlash', () => {
     const message = 'test';
     const type = 'alert';