How to use

end

function

in

Request

readStream.pipe(writeStream);
readStream.on('end', function () {
 readStream.end();
 callback(null, 'success');
 writeStream.end();
 fs.unlinkSync(fileDownloadPath);
 readStream.end();
 callback(null, 'fail');
 setTimeout(() => {
})
writeStream.on("finish", function () {
  readStream.end();
  writeStream.end();
 })
 .on('error',function(err){
  readStream.end();
  writeStream.end();