test/parallel/test-worker-process-env-shared.js

'use strict';
const common = require('../common');
const assert = require('assert');
const { Worker, parentPort, SHARE_ENV, workerData } = require('worker_threads');

if (!workerData) {
  process.env.SET_IN_PARENT = 'set';
  assert.strictEqual(process.env.SET_IN_PARENT, 'set');

  const w = new Worker(__filename, {
    workerData: 'runInWorker',
    env: SHARE_ENV
  }).on('exit', common.mustCall(() => {
    // Env vars from the child thread are not set globally.
    assert.strictEqual(process.env.SET_IN_WORKER, 'set');
  }));

  process.env.SET_IN_PARENT_AFTER_CREATION = 'set';
  w.postMessage({});
} else {
  assert.strictEqual(workerData, 'runInWorker');

  // Env vars from the parent thread are inherited.
  assert.strictEqual(process.env.SET_IN_PARENT, 'set');

  process.env.SET_IN_WORKER = 'set';
  assert.strictEqual(process.env.SET_IN_WORKER, 'set');

  parentPort.once('message', common.mustCall(() => {
    assert.strictEqual(process.env.SET_IN_PARENT_AFTER_CREATION, 'set');
  }));
}