refactor: utilize type narrowing (#33075)

PR Close #33075
2019-10-09 17:17:52 +02:00
parent 1ae77da609
commit 6ab5f3648a
29 changed files with 73 additions and 80 deletions
--- a/packages/zone.js/lib/node/events.ts
+++ b/packages/zone.js/lib/node/events.ts
@ -24,7 +24,7 @@ Zone.__load_patch('EventEmitter', (global: any) => {

  const eventNameToString = function(eventName: string|Symbol) {
    if (typeof eventName === 'string') {
-      return eventName as string;
+      return eventName;
    }
    if (!eventName) {
      return '';