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CountQueuingStrategy: highWaterMark property

The read-only CountQueuingStrategy.highWaterMark property returns the total number of chunks that can be contained in the internal queue before backpressure is applied.

Values

An integer representing a number of chunks.

Examples

js

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

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

const size = queuingStrategy.size(chunk);
console.log(`highWaterMark value: ${queuingStrategy.highWaterMark}$`);

Specifications

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
highWaterMark 52 16 65 No 39 10.1 52 52 65 41 10.3 6.0

See also

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https://developer.mozilla.org/en-US/docs/Web/API/CountQueuingStrategy/highWaterMark