import { type WritableStreamDefaultWriter } from "https://deno.land/x/deno@v1.41.0/ext/web/lib.deno_web.d.ts";
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.
import { WritableStreamDefaultWriter } from "https://deno.land/x/deno@v1.41.0/ext/web/lib.deno_web.d.ts";
type
{ readonly prototype: WritableStreamDefaultWriter; new <W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W>; }