Patch devcontainer.json

// threads.mjs
import { Worker, isMainThread,
  workerData, parentPort } from 'node:worker_threads';

if (isMainThread) {
  const data = 'some data';
  const worker = new Worker(import.meta.filename, { workerData: data });
  worker.on('message', msg => console.log('Reply from Thread:', msg));
} else {
  const source = workerData;
  parentPort.postMessage(btoa(source.toUpperCase()));
}

// run with `node threads.mjs`

.devcontainer/devcontainer.json

@@ -0,0 +1,5 @@
+{
+  "image": "mcr.microsoft.com/devcontainers/universal:2",
+  "features": {
+  }
+}