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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) {
// Since node 6.3.0 state.buffer is a BufferList not an array
if (state.buffer.head) {
return state.buffer.head.data.length
}
return state.buffer[0].length
}
return state.length
}