ByteLengthQueuingStrategy: size() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2019.

Note: This feature is available in Web Workers.

The size() method of the ByteLengthQueuingStrategy interface returns the given chunk's byteLength property.

Syntax

js
size(chunk)

Parameters

chunk

A chunk of data being passed through the stream.

Return value

An integer representing the byte length of the given chunk.

Examples

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

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

const size = queuingStrategy.size(chunk);

Specifications

Specification
Streams
# blqs-size

Browser compatibility

desktop mobile server
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Bun
Deno
Node.js
size
Chrome – Full support
Chrome 52 (Release date: 2016-07-20)
footnote Full support
Edge – Full support
Edge 16 (Release date: 2017-10-17)
footnote Full support
Firefox – Full support
Firefox 65 (Release date: 2019-01-29)
footnote Full support
Opera – Full support
Opera 39 (Release date: 2016-08-02)
footnote Full support
Safari – Full support
Safari 10.1 (Release date: 2017-03-27)
footnote Full support
Chrome Android – Full support
Chrome Android 52 (Release date: 2016-07-27)
footnote Full support
Firefox for Android – Full support
Firefox for Android 65 (Release date: 2019-01-29)
footnote Full support
Opera Android – Full support
Opera Android 41 (Release date: 2016-10-25)
footnote Full support
Safari on iOS – Full support
Safari on iOS 10.3 (Release date: 2017-03-27)
footnote Full support
Samsung Internet – Full support
Samsung Internet 6 (Release date: 2017-08-23)
footnote Full support
WebView Android – Full support
WebView Android 52 (Release date: 2016-07-27)
footnote Full support
WebView on iOS – Full support
WebView on iOS 10.3 (Release date: 2017-03-27)
footnote Full support
Bun – Full support
Bun 1 (Release date: 2023-09-08)
footnote Full support
Deno – Full support
Deno 1 (Release date: 2020-05-13)
footnote Full support
Node.js – Full support
Node.js 16.5 (Release date: 2021-07-14)
footnote Full support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also