worker: export workerData to ESM workers

Fixes: https://github.com/nodejs/node/issues/25765

PR-URL: https://github.com/nodejs/node/pull/25768
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

2 files changed, 19 insertions, 0 deletions

diff --git a/test/fixtures/worker-data.mjs b/test/fixtures/worker-data.mjs
new file mode 100644
index 0000000000..1ec884aadb
--- /dev/null
+++ b/test/fixtures/worker-data.mjs
@@ -0,0 +1,3 @@
+import { workerData, parentPort } from 'worker_threads';
+
+parentPort.postMessage(workerData);
diff --git a/test/parallel/test-worker-mjs-workerdata.js b/test/parallel/test-worker-mjs-workerdata.js
new file mode 100644
index 0000000000..c107730ea4
--- /dev/null
+++ b/test/parallel/test-worker-mjs-workerdata.js
@@ -0,0 +1,16 @@
+'use strict';
+const common = require('../common');
+const fixtures = require('../common/fixtures');
+const assert = require('assert');
+const { Worker } = require('worker_threads');
+
+const workerData = 'Hello from main thread';
+
+const worker = new Worker(fixtures.path('worker-data.mjs'), {
+  workerData,
+  execArgv: ['--experimental-modules']
+});
+
+worker.on('message', common.mustCall((message) => {
+  assert.strictEqual(message, workerData);
+}));