function copyNView codecopyN(r: Reader,dest: Writer,size: number): Promise<number>Deprecated(will be removed after 1.0.0) Use the Web Streams API instead. Copy N size at the most. If read size is lesser than N, then returns nread Parametersr: ReaderView codeReader dest: WriterView codeWriter size: numberView codeRead size Return TypePromise<number>View code