Web/API/WritableStream/locked

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This is an experimental technologyCheck 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 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

Specification	Status	Comment
StreamsThe definition of 'locked' in that specification.	Living Standard	Initial definition.

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
locked	Chrome Full support 59	Edge Full support 16	Firefox No support No	IE No support No	Opera Full support 47	Safari ?	WebView Android Full support 59	Chrome Android Full support 59	Firefox Android No support No	Opera Android Full support 44	Safari iOS ?	Samsung Internet Android Full support 7.0

Legend

Full support  

Full support

No support  

No support

Compatibility unknown  

Compatibility unknown

WritableStream.locked by Mozilla Contributors is licensed under CC-BY-SA 2.5.