4 files changed, 73 insertions, 31 deletions
diff --git a/cli/js/globals.ts b/cli/js/globals.ts
index be327722c..28910d76b 100644
--- a/cli/js/globals.ts
+++ b/cli/js/globals.ts
@@ -11,6 +11,7 @@ import * as promiseTypes from "./web/promise.ts";
 import * as customEvent from "./web/custom_event.ts";
 import * as domException from "./web/dom_exception.ts";
 import * as domFile from "./web/dom_file.ts";
+import * as errorEvent from "./web/error_event.ts";
 import * as event from "./web/event.ts";
 import * as eventTarget from "./web/event_target.ts";
 import * as formData from "./web/form_data.ts";
@@ -227,6 +228,7 @@ export const windowOrWorkerGlobalScopeProperties = {
   File: nonEnumerable(domFile.DomFileImpl),
   CustomEvent: nonEnumerable(customEvent.CustomEventImpl),
   DOMException: nonEnumerable(domException.DOMExceptionImpl),
+  ErrorEvent: nonEnumerable(errorEvent.ErrorEventImpl),
   Event: nonEnumerable(event.EventImpl),
   EventTarget: nonEnumerable(eventTarget.EventTargetImpl),
   URL: nonEnumerable(url.URLImpl),
diff --git a/cli/js/runtime_worker.ts b/cli/js/runtime_worker.ts
index 18f8841f9..ed735fd52 100644
--- a/cli/js/runtime_worker.ts
+++ b/cli/js/runtime_worker.ts
@@ -22,7 +22,8 @@ import * as denoNs from "./deno.ts";
 import * as denoUnstableNs from "./deno_unstable.ts";
 import * as webWorkerOps from "./ops/web_worker.ts";
 import { log, assert, immutableDefine } from "./util.ts";
-import { MessageEvent, ErrorEvent } from "./web/workers.ts";
+import { ErrorEventImpl as ErrorEvent } from "./web/error_event.ts";
+import { MessageEvent } from "./web/workers.ts";
 import { TextEncoder } from "./web/text_encoding.ts";
 import * as runtime from "./runtime.ts";
 import { internalObject, internalSymbol } from "./internals.ts";
diff --git a/cli/js/web/error_event.ts b/cli/js/web/error_event.ts
new file mode 100644
index 000000000..fbdd19fb5
--- /dev/null
+++ b/cli/js/web/error_event.ts
@@ -0,0 +1,68 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import { EventImpl as Event } from "./event.ts";
+import { defineEnumerableProps } from "./util.ts";
+
+export class ErrorEventImpl extends Event implements ErrorEvent {
+  #message: string;
+  #filename: string;
+  #lineno: number;
+  #colno: number;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  #error: any;
+
+  get message(): string {
+    return this.#message;
+  }
+  get filename(): string {
+    return this.#filename;
+  }
+  get lineno(): number {
+    return this.#lineno;
+  }
+  get colno(): number {
+    return this.#colno;
+  }
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  get error(): any {
+    return this.#error;
+  }
+
+  constructor(
+    type: string,
+    {
+      bubbles,
+      cancelable,
+      composed,
+      message = "",
+      filename = "",
+      lineno = 0,
+      colno = 0,
+      error = null,
+    }: ErrorEventInit = {}
+  ) {
+    super(type, {
+      bubbles: bubbles,
+      cancelable: cancelable,
+      composed: composed,
+    });
+
+    this.#message = message;
+    this.#filename = filename;
+    this.#lineno = lineno;
+    this.#colno = colno;
+    this.#error = error;
+  }
+
+  get [Symbol.toStringTag](): string {
+    return "ErrorEvent";
+  }
+}
+
+defineEnumerableProps(ErrorEventImpl, [
+  "message",
+  "filename",
+  "lineno",
+  "colno",
+  "error",
+]);
diff --git a/cli/js/web/workers.ts b/cli/js/web/workers.ts
index 6fcab3fe3..1e0762932 100644
--- a/cli/js/web/workers.ts
+++ b/cli/js/web/workers.ts
@@ -11,6 +11,7 @@ import { TextDecoder, TextEncoder } from "./text_encoding.ts";
 /*
 import { blobURLMap } from "./web/url.ts";
 */
+import { ErrorEventImpl as ErrorEvent } from "./error_event.ts";
 import { EventImpl as Event } from "./event.ts";
 import { EventTargetImpl as EventTarget } from "./event_target.ts";
 
@@ -41,36 +42,6 @@ export class MessageEvent extends Event {
   }
 }
 
-export interface ErrorEventInit extends EventInit {
-  message?: string;
-  filename?: string;
-  lineno?: number;
-  colno?: number;
-  error?: any;
-}
-
-export class ErrorEvent extends Event {
-  readonly message: string;
-  readonly filename: string;
-  readonly lineno: number;
-  readonly colno: number;
-  readonly error: any;
-
-  constructor(type: string, eventInitDict?: ErrorEventInit) {
-    super(type, {
-      bubbles: eventInitDict?.bubbles ?? false,
-      cancelable: eventInitDict?.cancelable ?? false,
-      composed: eventInitDict?.composed ?? false,
-    });
-
-    this.message = eventInitDict?.message ?? "";
-    this.filename = eventInitDict?.filename ?? "";
-    this.lineno = eventInitDict?.lineno ?? 0;
-    this.colno = eventInitDict?.colno ?? 0;
-    this.error = eventInitDict?.error ?? null;
-  }
-}
-
 function encodeMessage(data: any): Uint8Array {
   const dataJson = JSON.stringify(data);
   return encoder.encode(dataJson);