// https://streams.spec.whatwg.org/#writablestreamdefaultwriter
[Exposed=*]
interface WritableStreamDefaultWriter {
    constructor(WritableStream stream);

    readonly attribute Promise<undefined> closed;
    readonly attribute unrestricted double? desiredSize;
    readonly attribute Promise<undefined> ready;

    Promise<undefined> abort(optional any reason);
    Promise<undefined> close();
    undefined releaseLock();
    Promise<undefined> write(optional any chunk);
};