module.exports = shift function shift (stream) { var rs = stream._readableState if (!rs) return null return (rs.objectMode || typeof stream._duplexState === 'number') ? stream.read() : stream.read(getStateLength(rs)) } function getStateLength (state) { if (state.buffer.length) { var idx = state.bufferIndex || 0 // Since node 6.3.0 state.buffer is a BufferList not an array if (state.buffer.head) { return state.buffer.head.data.length } else if (state.buffer.length - idx > 0 && state.buffer[idx]) { return state.buffer[idx].length } } return state.length }