# WHATWG Streams

> ReadableStream, WritableStream, TransformStream, and their readers, writers, and strategies.

`ReadableStream`, `WritableStream`, `TransformStream`, their readers, writers, and controllers,
`CountQueuingStrategy`, and `ByteLengthQueuingStrategy` are globals. They follow the
[Streams Standard](https://streams.spec.whatwg.org/), including byte streams, BYOB readers, and `ReadableStream.from()`.

## Differences from browsers

- A stream cannot be transferred to a worker: naming one in a `postMessage` transfer list throws `DataCloneError`.

For byte transforms, see [Compression Streams](https://elide.help/docs/api-whatwg-compression).