1 files changed, 11 insertions, 12 deletions
diff --git a/cli/js/web/custom_event.ts b/cli/js/web/custom_event.ts
index 24a263baf..418b7ea34 100644
--- a/cli/js/web/custom_event.ts
+++ b/cli/js/web/custom_event.ts
@@ -1,32 +1,31 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import * as domTypes from "./dom_types.ts";
 import * as event from "./event.ts";
-import { getPrivateValue, requiredArguments } from "./util.ts";
-
-// WeakMaps are recommended for private attributes (see MDN link below)
-// https://developer.mozilla.org/en-US/docs/Archive/Add-ons/Add-on_SDK/Guides/Contributor_s_Guide/Private_Properties#Using_WeakMaps
-export const customEventAttributes = new WeakMap();
+import { requiredArguments } from "./util.ts";
 
 export class CustomEvent extends event.Event implements domTypes.CustomEvent {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  #detail: any;
+
   constructor(
     type: string,
     customEventInitDict: domTypes.CustomEventInit = {}
   ) {
-    requiredArguments("CustomEvent", arguments.length, 1);
     super(type, customEventInitDict);
+    requiredArguments("CustomEvent", arguments.length, 1);
     const { detail = null } = customEventInitDict;
-    customEventAttributes.set(this, { detail });
+    this.#detail = detail;
   }
 
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   get detail(): any {
-    return getPrivateValue(this, customEventAttributes, "detail");
+    return this.#detail;
   }
 
   initCustomEvent(
-    type: string,
-    bubbles?: boolean,
-    cancelable?: boolean,
+    _type: string,
+    _bubbles?: boolean,
+    _cancelable?: boolean,
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     detail?: any
   ): void {
@@ -34,7 +33,7 @@ export class CustomEvent extends event.Event implements domTypes.CustomEvent {
       return;
     }
 
-    customEventAttributes.set(this, { detail });
+    this.#detail = detail;
   }
 
   get [Symbol.toStringTag](): string {