refactor(): use const and let instead of var

modules/playground/e2e_test/async/async_spec.ts

@@ -11,19 +11,19 @@ import {$, browser} from 'protractor';
 import {promise} from 'selenium-webdriver';
 
 describe('async', () => {
-  var URL = 'all/playground/src/async/index.html';
+  const URL = 'all/playground/src/async/index.html';
 
   beforeEach(() => browser.get(URL));
 
   it('should work with synchronous actions', () => {
-    var increment = $('#increment');
+    const increment = $('#increment');
     increment.$('.action').click();
 
     expect(increment.$('.val').getText()).toEqual('1');
   });
 
   it('should wait for asynchronous actions', () => {
-    var timeout = $('#delayedIncrement');
+    const timeout = $('#delayedIncrement');
 
     // At this point, the async action is still pending, so the count should
     // still be 0.
@@ -37,7 +37,7 @@ describe('async', () => {
   });
 
   it('should notice when asynchronous actions are cancelled', () => {
-    var timeout = $('#delayedIncrement');
+    const timeout = $('#delayedIncrement');
 
     // At this point, the async action is still pending, so the count should
     // still be 0.
@@ -55,7 +55,7 @@ describe('async', () => {
   });
 
   it('should wait for a series of asynchronous actions', () => {
-    var timeout = $('#multiDelayedIncrements');
+    const timeout = $('#multiDelayedIncrements');
 
     // At this point, the async action is still pending, so the count should
     // still be 0.
@@ -69,14 +69,14 @@ describe('async', () => {
   });
 
   it('should wait via frameworkStabilizer', () => {
-    var whenAllStable = (): promise.Promise<any> => {
+    const whenAllStable = (): promise.Promise<any> => {
       return browser.executeAsyncScript('window.frameworkStabilizers[0](arguments[0]);');
     };
 
     // This disables protractor's wait mechanism
     browser.ignoreSynchronization = true;
 
-    var timeout = $('#multiDelayedIncrements');
+    const timeout = $('#multiDelayedIncrements');
 
     // At this point, the async action is still pending, so the count should
     // still be 0.