WritableStreamDefaultController
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since May 2022.
Note: This feature is available in Web Workers.
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.
Instance properties
WritableStreamDefaultController.signalRead only-
Returns the
AbortSignalassociated with the controller.
Instance methods
WritableStreamDefaultController.error()-
Causes any future interactions with the associated stream to error.
Examples
js
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 # ws-default-controller-class |
Browser compatibility
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