ByteLengthQueuingStrategy

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

The ByteLengthQueuingStrategy interface of the the Streams API provides a built-in byte length queuing strategy that can be used when constructing streams.

Constructor

ByteLengthQueuingStrategy()
Creates a new ByteLengthQueuingStrategy object instance.

Properties

None.

Methods

ByteLengthQueuingStrategy.size()
Returns the given chunk’s byteLength property.

Examples

const queuingStrategy = new ByteLengthQueuingStrategy({ highWaterMark: 1 });

const readableStream = new ReadableStream({
  start(controller) {
    ...
  },
  pull(controller) {
    ...
  },
  cancel(err) {
    console.log("stream error:", err);
  }
}, queuingStrategy);

var size = queueingStrategy.size(chunk);

Specifications

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

Browser Compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Experimental
Chrome Full support 59Edge Full support 16Firefox Full support 57
Disabled
Full support 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.
IE No support NoOpera Full support 46Safari ? WebView Android Full support 59Chrome Android Full support 59Edge Mobile Full support 16Firefox Android Full support 57
Disabled
Full support 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.
Opera Android Full support 46Safari iOS ? Samsung Internet Android Full support 7.0
ByteLengthQueuingStrategy() constructor
Experimental
Chrome Full support 59Edge Full support 16Firefox Full support 57
Disabled
Full support 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.
IE No support NoOpera Full support 46Safari ? WebView Android Full support 59Chrome Android Full support 59Edge Mobile Full support 16Firefox Android Full support 57
Disabled
Full support 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.
Opera Android Full support 46Safari iOS ? Samsung Internet Android Full support 7.0
size
Experimental
Chrome Full support 59Edge Full support 16Firefox Full support 57
Disabled
Full support 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.
IE No support NoOpera Full support 46Safari ? WebView Android Full support 59Chrome Android Full support 59Edge Mobile Full support 16Firefox Android Full support 57
Disabled
Full support 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.
Opera Android Full support 46Safari iOS ? Samsung Internet Android Full support 7.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.
User must explicitly enable this feature.

Document Tags and Contributors

Contributors to this page: fscholz, chrisdavidmills, ricea
Last updated by: fscholz,