ByteLengthQueuingStrategy: highWaterMark property
The read-only ByteLengthQueuingStrategy.highWaterMark property returns the total number of bytes that can be contained in the internal queue before backpressure is applied.
Note: Unlike CountQueuingStrategy() where the highWaterMark property specifies a simple count of the number of chunks, with ByteLengthQueuingStrategy(), the highWaterMark parameter specifies a number of bytes — specifically, given a stream of chunks, how many bytes worth of those chunks (rather than a count of how many of those chunks) can be contained in the internal queue before backpressure is applied.
Values
Examples
const queuingStrategy = new ByteLengthQueuingStrategy({
highWaterMark: 1 * 1024,
});
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