lib/index.js
function through(transform, flush, objectMode) {
  const stream = new TransformStream({objectMode})
  stream._transform = transform || pass
  if (flush) stream._flush = flush
  return stream
}
function through(transform, flush, objectMode) {
  const stream = new TransformStream({objectMode})
  stream._transform = transform || pass
  if (flush) stream._flush = flush
  return stream
}
function through ( transform , flush , objectMode ) { const stream = new TransformStream ( { objectMode } ) stream . _transform = transform || pass if ( flush ) stream . _flush = flush return stream }
Quickly create a object-mode duplex stream
@param {function?} transform(chunk, encoding, done)
@param {function?} flush(done)
@param {boolean} objectMode
@return {DuplexStream}
Quickly create a object - mode duplex stream