WritableStreamDefaultController

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

The WritableStreamDefaultController interface of the Streams API represents a controller allowing control of a WritableStream's state. When constructing a WritableStream, the underlying sink is given a corresponding WritableStreamDefaultController instance to manipulate.

Constructor

None. WritableStreamDefaultController instances are created automatically during WritableStream construction.

Properties

None.

Methods

WritableStreamDefaultController.error()

Causes any future interactions with the associated stream to error.

Examples

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

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

Specifications

Specification
Streams Standard (Streams)
# ws-default-controller-class

Browser compatibility

BCD tables only load in the browser