WritableStreamDefaultWriter.closed

Baseline Widely available

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

WritableStreamDefaultWriter 接口的只读属性 closed 返回一个 Promise，这个 promise 在流关闭时兑现，而在流抛出错误或者 writer 的锁被释放时拒绝。

值

一个 Promise。

示例

js
const writableStream = new WritableStream({
  start(controller) {
  },
  write(chunk, controller) {
    ...
  },
  close(controller) {
    ...
  },
  abort(err) {
    ...
  }
}, queuingStrategy);

...

const writer = writableStream.getWriter();

..

// check if the stream is closed
writer.closed.then(() => {
  console.log('writer closed');
})

规范

Specification
Streams
# ref-for-default-writer-closed②

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