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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultWriter/closed below:

WritableStreamDefaultWriter: closed property - Web APIs

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Note: This feature is available in Web Workers.

The closed read-only property of the WritableStreamDefaultWriter interface returns a Promise that fulfills if the stream becomes closed, or rejects if the stream errors or the writer's lock is released.

A Promise.

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");
});

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