node:worker_threads API Reference

The namespace includes Worker, MessageChannel, MessagePort, BroadcastChannel, thread metadata, environment data, and transfer markers.

Export	Purpose
`Worker`	Construct a worker from a file or evaluated source.
`isMainThread`, `isInternalThread`, `threadId`	Identify the current thread.
`parentPort`, `workerData`	Communicate with a parent worker.
`MessageChannel`, `MessagePort`, `BroadcastChannel`	Messaging primitives.
`getEnvironmentData()`, `setEnvironmentData()`	Worker environment data.
`receiveMessageOnPort()`	Read a queued port message synchronously.
transfer-marker functions	Control cloning and transfer.
`SHARE_ENV`, `resourceLimits`	Worker configuration values.

Heap snapshots, port-to-context movement, and direct thread posting are not complete.

In 1.5, a new worker does not keep elide run alive. A standalone script can exit before worker event handlers run. Do not rely on Worker for standalone background work until lifecycle integration is complete.

For same-realm channels, see Web Messaging.

See also