code: function extract(npmignore) {
    if (npmignore == null) {
      throw new Error('npmignore expects a string.');
    }
  
    var lines = split(npmignore);
    var len = lines.length;
    var npmignored = false;
    var git = [];
    var npm = [];
    var i = 0;
  
    while (i < len) {
      var line = lines[i++];
      if (re.test(line)) {
        npmignored = true;
      }
  
      if (npmignored) {
        npm.push(line);
      } else {
        git.push(line);
      }
    }
  
    return npm;
  }
docs: Extract relevant lines from `.npmignore`
  
  @param  {String} `npmignore` string
  @return {Array} Array of lines