function copyNimport { copyN } from "https://deno.land/x/deno@v0.28.0/std/io/ioutil.ts"; copyN(dest: Writer,r: Reader,size: number,): Promise<number>copy N size at the most. If read size is lesser than N, then returns nread Parametersdest: Writerr: Readersize: numberReturnsPromise<number>