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WritableStreamDefaultController: error() method - Web APIs

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The error() method of the WritableStreamDefaultController interface causes any future interactions with the associated stream to error.

This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the normal lifecycle of interactions with the underlying sink.

message

A string representing the error you want future interactions to fail with.

None (undefined).

TypeError

The stream you are trying to error is not a WritableStream.

const writableStream = new WritableStream({
  start(controller) {
    // do stuff with controller

    // error stream if necessary
    controller.error("My error is broken");
  },
  write(chunk, controller) {
    // …
  },
  close(controller) {
    // …
  },
  abort(err) {
    // …
  },
});

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