CountQueuingStrategy: highWaterMark プロパティ

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since June 2022.

CountQueuingStrategy.highWaterMark は読み取り専用プロパティで、背圧が適用される前の内部キューに含まれているチャンクの総数です。

値

チャンク数を表す整数です。

例

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: ${queuingStrategy.highWaterMark}$`);

仕様書

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

ブラウザーの互換性

BCD tables only load in the browser

関連情報