lib/logger.js
function format(color, messages) {
  var length = messages.length;

  if (length === 0 || typeof(color) !== 'string') {
    return;
  }

  return (util.format.apply(null, messages)[color]);
}
function format(color, messages) {
  var length = messages.length;

  if (length === 0 || typeof(color) !== 'string') {
    return;
  }

  return (util.format.apply(null, messages)[color]);
}
colorize strings and send to console.log