function copyNimport { copyN } from "https://deno.land/std@0.177.0/io/copy_n.ts"; copyN(r: Reader,dest: Writer,size: number,): Promise<number>Copy N size at the most. If read size is lesser than N, then returns nread Parametersr: ReaderReader dest: WriterWriter size: numberRead size ReturnsPromise<number>