WritableStreamDefaultWriter
This Streams API interface is the object returned by WritableStream.getWriter() and once created locks the < writer to the WritableStream ensuring that no other streams can write to the underlying sink.
interface WritableStreamDefaultWriter <W = any> {
readonly closed: Promise<void>;
readonly desiredSize: number | null;
readonly ready: Promise<void>;
abort(reason?: any): Promise<void>;
close(): Promise<void>;
releaseLock(): void;
write(chunk: W): Promise<void>;
}var WritableStreamDefaultWriter: {
readonly prototype: WritableStreamDefaultWriter;
new <W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W>;
};