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CountQueuingStrategy

The CountQueuingStrategy interface of the Streams API provides a built-in chunk counting queuing strategy that can be used when constructing streams.

Constructor

CountQueuingStrategy()

Creates a new CountQueuingStrategy object instance.

Instance properties

CountQueuingStrategy.highWaterMark Read only

The total number of chunks that can be contained in the internal queue before backpressure is applied.

Instance methods

CountQueuingStrategy.size()

Always returns 1.

Examples

js

const queueingStrategy = new CountQueuingStrategy({ highWaterMark: 1 });

const writableStream = new WritableStream(
  {
    // Implement the sink
    write(chunk) {
      // …
    },
    close() {
      // …
    },
    abort(err) {
      console.log("Sink error:", err);
    },
  },
  queueingStrategy,
);

const size = queueingStrategy.size();

Specifications

Specification
Streams Standard
# cqs-class

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
CountQueuingStrategy 52 16 65 No 39 10.1 52 52 65 41 10.3 6.0
CountQueuingStrategy 52 16 65 No 39 10.1 52 52 65 41 10.3 6.0
highWaterMark 52 16 65 No 39 10.1 52 52 65 41 10.3 6.0
size 52 16 65 No 39 10.1 52 52 65 41 10.3 6.0

See also

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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/CountQueuingStrategy