CountQueuingStrategy

Note: This feature is available in Web Workers.

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
# cqs-class

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
CountQueuingStrategy
CountQueuingStrategy() constructor
highWaterMark
size

Legend

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Full support
Full support
Partial support
Partial support
Has more compatibility info.

See also