node/test/common/wpt/worker.js

'use strict';

const { runInNewContext, runInThisContext } = require('vm');
const { setFlagsFromString } = require('v8');
const { parentPort, workerData } = require('worker_threads');

const { ResourceLoader } = require(workerData.wptRunner);
const resource = new ResourceLoader(workerData.wptPath);

if (workerData.needsGc) {
  // See https://github.com/nodejs/node/issues/16595#issuecomment-340288680
  setFlagsFromString('--expose-gc');
  globalThis.gc = runInNewContext('gc');
}

globalThis.self = global;
globalThis.GLOBAL = {
  isWindow() { return false; },
  isShadowRealm() { return false; },
};
globalThis.require = require;

// This is a mock for non-fetch tests that use fetch to resolve
// a relative fixture file.
// Actual Fetch API WPTs are executed in nodejs/undici.
globalThis.fetch = function fetch(file) {
  return resource.readAsFetch(workerData.testRelativePath, file);
};

if (workerData.initScript) {
  runInThisContext(workerData.initScript);
}

runInThisContext(workerData.harness.code, {
  filename: workerData.harness.filename,
});

// eslint-disable-next-line no-undef
add_result_callback((result) => {
  parentPort.postMessage({
    type: 'result',
    result: {
      status: result.status,
      name: result.name,
      message: result.message,
      stack: result.stack,
    },
  });
});

// Keep the event loop alive
const timeout = setTimeout(() => {
  parentPort.postMessage({
    type: 'completion',
    status: { status: 2 },
  });
}, 2 ** 31 - 1); // Max timeout is 2^31-1, when overflown the timeout is set to 1.

// eslint-disable-next-line no-undef
add_completion_callback((_, status) => {
  clearTimeout(timeout);
  parentPort.postMessage({
    type: 'completion',
    status,
  });
});

for (const scriptToRun of workerData.scriptsToRun) {
  runInThisContext(scriptToRun.code, { filename: scriptToRun.filename });
}