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WritableStream: locked property

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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
locked 59 16 100 No 47 14.1 59 59 100 44 14.5 7.0

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https://developer.mozilla.org/en-US/docs/Web/API/WritableStream/locked