ReadableStreamDefaultController : ReadableStreamController

Controls a ReadableStream's state and queue.

Instance Properties

desiredSize : Number readonly

Instance Methods

Causes the owning stream to close.

Example:

// Create a stream of strings.
const stringStream = new ReadableStream({
  start(controller) {
    controller.enqueue('a');
    controller.enqueue('b');
    controller.close();
  }
});

const reader = stringStream.getReader();
let result;
while (!(result = await reader.read()).done) {
  console.log(result.value);
}
console.log('done');

Run

Results:

enqueue(chunk : Object) : undefined

Causes the owning stream to return chunk.

Example:

// Create a stream of strings.
const stringStream = new ReadableStream({
  start(controller) {
    ['a', 'b', 'c'].forEach(s => controller.enqueue(s));
    controller.close();
  }
});

const reader = stringStream.getReader();
let result;
while (!(result = await reader.read()).done) {
  console.log(result.value);
}

Run

Results:

Spec

error(reason : Object) : undefined

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