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ReadableStream.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 ReadableStream interface returns whether or not the readable stream is locked to a reader.

Syntax

var locked = readableStreamInstance.locked;

Value

A Boolean indicating whether or not the readable stream is locked.

Examples

const stream = new ReadableStream({
  ...
});

const reader = stream.getReader();

stream.locked
// should return true, as the stream has been locked to a reader

Specifications

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

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 43 16 57
Disabled
57
Disabled
Disabled From version 57: this feature is behind the dom.streams.enabled preference (needs to be set to true) and the javascript.options.streams preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 30 ?
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support 43 43 16 57
Disabled
57
Disabled
Disabled From version 57: this feature is behind the dom.streams.enabled preference (needs to be set to true) and the javascript.options.streams preference (needs to be set to true). To change preferences in Firefox, visit about:config.
30 ? 4.0

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/locked