bad-vm-module.js

'use strict';

const { Module } = require('vm');

process.on('unhandledRejection', p => {
  process.nextTick(() => { throw p; });
});

(async () => {
  const rootModule = new Module('export default 5;');
  const slowModule = new Module(`import five from 'root'; export default five;`);
  const topModule = new Module(`import five from 'slow'; console.log(five);`);

  await rootModule.link(() => {});
  // This is never awaited!
  slowModule.link(() => new Promise((resolve, reject) => {
    setTimeout(resolve, 1000, rootModule);
  }));
  await topModule.link(() => slowModule);
  topModule.instantiate();
})();