WritableStream.locked

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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

Syntax

var locked = writableStream.locked;

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

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
No
No
47
14.1
59
59
No
44
14.5
7.0

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