WritableStreamDefaultWriter.closed

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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.

Value

A Promise.

Examples

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

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

Browser compatibility

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