function copyNimport { copyN } from "https://dotland.deno.dev/std@0.119.0/io/mod.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 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>