serenity/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.idl

// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller
[Exposed=*]
interface ReadableStreamDefaultController {
    readonly attribute unrestricted double? desiredSize;

    undefined close();
    undefined enqueue(optional any chunk);
    undefined error(optional any e);
};