denoland-deno/cli/tests/testdata/worker_drop_handle_race_terminate.js

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.

// Test that the panic in https://github.com/denoland/deno/issues/11342 does not
// happen when calling worker.terminate() after fixing
// https://github.com/denoland/deno/issues/13705

function getCodeBlobUrl(code) {
  const blob = new Blob([code], { type: "text/javascript" });
  return URL.createObjectURL(blob);
}

const WORKER2 = getCodeBlobUrl(`
  console.log("Worker 2");
  self.postMessage(undefined);

  // We sleep for slightly under 2 seconds in order to make sure that worker 1
  // has closed, and that this worker's thread finishes normally rather than
  // being killed (which happens 2 seconds after calling terminate).
  Deno.sleepSync(1800);
  console.log("Finished sleeping in worker 2");
`);

const WORKER1 = getCodeBlobUrl(`
  console.log("Worker 1");
  const worker = new Worker(
    ${JSON.stringify(WORKER2)},
    { type: "module", deno: { namespace: true } }
  );

  worker.addEventListener("message", () => {
    console.log("Terminating");
    worker.terminate();
    self.close();
  });
`);

new Worker(WORKER1, { type: "module", deno: { namespace: true } });

// Don't kill the process before worker 2 is finished.
setTimeout(() => {}, 3000);