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WritableStreamDefaultWriter: closed property

files/en-us/web/api/writablestreamdefaultwriter/closed/index.md

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{{APIRef("Streams")}}{{AvailableInWorkers}}

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

Value

A {{jsxref("Promise")}}.

Examples

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");
});

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}