ByteLengthQueuingStrategy: size() method

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

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Note: This feature is available in Web Workers.

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

Syntax

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

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);