Method start

packages/deno/lib.deno.d.ts:8960–8960

* Begins dispatching messages received on the port. This is implicitly called * when assigning a value to `this.onmessage`.

()

   * when assigning a value to `this.onmessage`.
   */
  start(): void;
  addEventListener<K extends keyof MessagePortEventMap>(
    type: K,
    listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any,