test-vm-timeout-escape-promise-module.js

// Flags: --experimental-vm-modules
'use strict';

// https://github.com/nodejs/node/issues/3020
// Promises used to allow code to escape the timeout
// set for runInContext, runInNewContext, and runInThisContext.

const common = require('../common');
const assert = require('assert');
const vm = require('vm');

const NS_PER_MS = 1000000n;

const hrtime = process.hrtime.bigint;

function loop() {
  const start = hrtime();
  while (1) {
    const current = hrtime();
    const span = (current - start) / NS_PER_MS;
    if (span >= 2000n) {
      throw new Error(
        `escaped timeout at ${span} milliseconds!`);
    }
  }
}

assert.rejects(async () => {
  const module = new vm.SourceTextModule(
    'Promise.resolve().then(() => loop()); loop();',
    {
      context: vm.createContext({
        hrtime,
        loop
      }, { microtaskMode: 'afterEvaluate' })
    });
  await module.link(common.mustNotCall());
  await module.evaluate({ timeout: 5 });
}, {
  code: 'ERR_SCRIPT_EXECUTION_TIMEOUT',
  message: 'Script execution timed out after 5ms'
});