WritableStream.locked

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

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

Syntax

var locked = writableStreamInstance.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
Streams
The definition of 'locked' in that specification.
Living Standard Initial definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support5916 No No47 ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support595916 No47 ?7.0

Document Tags and Contributors

 Contributors to this page: jpmedley, chrisdavidmills
 Last updated by: jpmedley,