WritableStreamDefaultWriter.closed

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 Standard
# ref-for-default-writer-closed②

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