WritableStream: locked property

Available in 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

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