diff --git a/cli/js/lib.deno.shared_globals.d.ts b/cli/js/lib.deno.shared_globals.d.ts
index a1e834cc42..f7f9b346ba 100644
--- a/cli/js/lib.deno.shared_globals.d.ts
+++ b/cli/js/lib.deno.shared_globals.d.ts
@@ -1037,6 +1037,10 @@ declare const URL: {
   revokeObjectURL(url: string): void;
 };
 
+interface PostMessageOptions {
+  transfer?: any[];
+}
+
 declare class Worker {
   onerror?: (e: Event) => void;
   onmessage?: (data: any) => void;
@@ -1048,7 +1052,8 @@ declare class Worker {
       name?: string;
     }
   );
-  postMessage(data: any): void;
+  postMessage(message: any, transfer: ArrayBuffer[]): void;
+  postMessage(message: any, options?: PostMessageOptions): void;
   terminate(): void;
 }
 
diff --git a/cli/js/lib.deno.worker.d.ts b/cli/js/lib.deno.worker.d.ts
index ca3670c774..e1db7e691e 100644
--- a/cli/js/lib.deno.worker.d.ts
+++ b/cli/js/lib.deno.worker.d.ts
@@ -9,6 +9,7 @@
 declare interface DedicatedWorkerGlobalScope {
   self: DedicatedWorkerGlobalScope & typeof globalThis;
   onmessage: (e: { data: any }) => void;
+  location: Location;
   onerror: undefined | typeof onerror;
   name: typeof __workerMain.name;
   close: typeof __workerMain.close;
diff --git a/cli/js/web/workers.ts b/cli/js/web/workers.ts
index 054c26193b..421b82fbcd 100644
--- a/cli/js/web/workers.ts
+++ b/cli/js/web/workers.ts
@@ -160,12 +160,18 @@ export class WorkerImpl extends EventTarget implements Worker {
     }
   };
 
-  postMessage(data: any): void {
+  postMessage(message: any, transferOrOptions?: any): void {
+    if (transferOrOptions) {
+      throw new Error(
+        "Not yet implemented: `transfer` and `options` are not supported."
+      );
+    }
+
     if (this.#terminated) {
       return;
     }
 
-    hostPostMessage(this.#id, encodeMessage(data));
+    hostPostMessage(this.#id, encodeMessage(message));
   }
 
   terminate(): void {