CountQueuingStrategy: highWaterMark property

Baseline 2022

Newly available

Since June 2022, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

Note: This feature is available in Web Workers.

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

Specification
Streams Standard
# ref-for-cqs-high-water-mark①

Browser compatibility

BCD tables only load in the browser

See also