index.js
function Parser (opts) {
  opts = opts || {}
  stream.Transform.call(this, {objectMode: true})
  this._extract = parse.mkextract(opts)
}
function Parser (opts) {
  opts = opts || {}
  stream.Transform.call(this, {objectMode: true})
  this._extract = parse.mkextract(opts)
}
/* ------- Transform stream -------