Adds a new create flash function

The new function takes an object
as its parameter.

Add additional specs

app/assets/javascripts/flash.js

+import * as Sentry from '@sentry/browser';
 import { escape } from 'lodash';
 import { spriteIcon } from './lib/utils/common_utils';
 
@@ -109,8 +110,65 @@ 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 {Object} options                   Options to control the flash message
+ *  @param {String} options.message           Flash message text
+ *  @param {String} options.type              Type of Flash, it can be `notice`, `success`, `warning` or `alert` (default)
+ *  @param {Object} options.parent            Reference to parent element under which Flash needs to appear
+ *  @param {Object} options.actonConfig       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} options.fadeTransition   Boolean to determine whether to fade the alert out
+ *  @param {Boolean} options.captureError     Boolean to determine whether to send error to sentry
+ *  @param {Object} options.error              Error to be captured in sentry
+ */
+const newCreateFlash = function newCreateFlash({
+  message,
+  type = FLASH_TYPES.ALERT,
+  parent = document,
+  actionConfig = null,
+  fadeTransition = true,
+  addBodyClass = false,
+  captureError = false,
+  error = null,
+}) {
+  const flashContainer = parent.querySelector('.flash-container');
+
+  if (!flashContainer) return null;
+
+  flashContainer.innerHTML = createFlashEl(message, type);
+
+  const flashEl = flashContainer.querySelector(`.flash-${type}`);
+
+  if (actionConfig) {
+    flashEl.insertAdjacentHTML('beforeend', createAction(actionConfig));
+
+    if (actionConfig.clickHandler) {
+      flashEl
+        .querySelector('.flash-action')
+        .addEventListener('click', e => actionConfig.clickHandler(e));
+    }
+  }
+
+  removeFlashClickListener(flashEl, fadeTransition);
+
+  flashContainer.classList.add('gl-display-block');
+
+  if (addBodyClass) document.body.classList.add('flash-shown');
+
+  if (captureError && error) Sentry.captureException(error);
+
+  return flashContainer;
+};
+
 export {
   createFlash as default,
+  newCreateFlash,
   createFlashEl,
   createAction,
   hideFlash,

spec/frontend/flash_spec.js

-import flash, { createFlashEl, createAction, hideFlash, removeFlashClickListener } from '~/flash';
+import flash, {
+  newCreateFlash,
+  createFlashEl,
+  createAction,
+  hideFlash,
+  removeFlashClickListener,
+} from '~/flash';
 
 describe('Flash', () => {
   describe('createFlashEl', () => {
@@ -205,6 +211,109 @@ describe('Flash', () => {
     });
   });
 
+  describe('newCreateFlash', () => {
+    const message = 'test';
+    const type = 'alert';
+    const parent = document;
+    const fadeTransition = false;
+    const addBodyClass = true;
+    const defaultParams = {
+      message,
+      type,
+      parent,
+      actionConfig: null,
+      fadeTransition,
+      addBodyClass,
+    };
+
+    describe('no flash-container', () => {
+      it('does not add to the DOM', () => {
+        const flashEl = newCreateFlash({ 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', () => {
+        newCreateFlash({ ...defaultParams });
+
+        expect(document.querySelector('.flash-alert')).not.toBeNull();
+
+        expect(document.body.className).toContain('flash-shown');
+      });
+
+      it('adds flash into specified parent', () => {
+        newCreateFlash({ ...defaultParams, parent: document.querySelector('.content-wrapper') });
+
+        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', () => {
+        newCreateFlash(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';
+        newCreateFlash(defaultParams);
+
+        expect(document.querySelector('.flash-text').className.trim()).toContain('flash-text');
+      });
+
+      it('removes element after clicking', () => {
+        newCreateFlash({ ...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', () => {
+          newCreateFlash({
+            ...defaultParams,
+            actionConfig: {
+              title: 'test',
+            },
+          });
+
+          expect(document.querySelector('.flash-action')).not.toBeNull();
+        });
+
+        it('calls actionConfig clickHandler on click', () => {
+          const actionConfig = {
+            title: 'test',
+            clickHandler: jest.fn(),
+          };
+
+          newCreateFlash({ ...defaultParams, actionConfig });
+
+          document.querySelector('.flash-action').click();
+
+          expect(actionConfig.clickHandler).toHaveBeenCalled();
+        });
+      });
+    });
+  });
+
   describe('removeFlashClickListener', () => {
     beforeEach(() => {
       document.body.innerHTML += `