chromium/third_party/blink/web_tests/external/wpt/wasm/serialization/module/resources/incrementer-worker-with-channel.js

"use strict";
importScripts("/resources/testharness.js");
importScripts("./test-incrementer.js");

self.onmessage = ({ data }) => {
  // data will be a MessagePort
  setupDestinationIncrementer(data, data);
};