WritableStream: locked property

Note: This feature is available in Web Workers.

The locked read-only property of the WritableStream interface returns a boolean indicating whether the WritableStream is locked to a writer.

Value

A boolean value indicating whether or not the writable stream is locked.

Examples

js
const writableStream = new WritableStream(
  {
    write(chunk) {
      // ...
    },
    close() {
      // ...
    },
    abort(err) {
      // ...
    },
  },
  queuingStrategy,
);

// ...

const writer = writableStream.getWriter();

writableStream.locked;
// should return true, as the stream has been locked to a writer

Specifications

Specification
Streams
# ref-for-ws-locked②

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
locked

Legend

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Full support
Full support