avoid prototype builtin hasOwnProperty (#2144)

1 files changed, 4 insertions, 4 deletions

diff --git a/js/event_target.ts b/js/event_target.ts
index cc436865e..87268383e 100644
--- a/js/event_target.ts
+++ b/js/event_target.ts
@@ -1,6 +1,6 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import * as domTypes from "./dom_types";
-import { requiredArguments } from "./util";
+import { requiredArguments, hasOwnProperty } from "./util";
 
 /* TODO: This is an incomplete implementation to provide functionality
  * for Event. A proper spec is still required for a proper Web API.
@@ -16,7 +16,7 @@ export class EventTarget implements domTypes.EventTarget {
     _options?: boolean | domTypes.AddEventListenerOptions
   ): void {
     requiredArguments("EventTarget.addEventListener", arguments.length, 2);
-    if (!this.listeners.hasOwnProperty(type)) {
+    if (!hasOwnProperty(this.listeners, type)) {
       this.listeners[type] = [];
     }
     if (listener !== null) {
@@ -30,7 +30,7 @@ export class EventTarget implements domTypes.EventTarget {
     _options?: domTypes.EventListenerOptions | boolean
   ): void {
     requiredArguments("EventTarget.removeEventListener", arguments.length, 2);
-    if (this.listeners.hasOwnProperty(type) && callback !== null) {
+    if (hasOwnProperty(this.listeners, type) && callback !== null) {
       this.listeners[type] = this.listeners[type].filter(
         listener => listener !== callback
       );
@@ -39,7 +39,7 @@ export class EventTarget implements domTypes.EventTarget {
 
   public dispatchEvent(event: domTypes.Event): boolean {
     requiredArguments("EventTarget.dispatchEvent", arguments.length, 1);
-    if (!this.listeners.hasOwnProperty(event.type)) {
+    if (!hasOwnProperty(this.listeners, event.type)) {
       return true;
     }
     const stack = this.listeners[event.type].slice();