// source: 
var FN_ARGS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m;
var FN_ARG_SPLIT = /,/;
var FN_ARG = /^\s*(_?)(\S+?)\1\s*$/;
var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
var SIGNATURE = '__signature_' + require('hat')();

exports.parse = parse;
function parse (fn) {
  if (typeof fn !== 'function') {
    throw new TypeError("Not a function: " + fn);
  }
  if (!fn[SIGNATURE]) {
    fn[SIGNATURE] = _parse(fn);
  }
  return fn[SIGNATURE];
}

exports.clobber = clobber;
function clobber (fn, names) {
  fn[SIGNATURE] = names;
  return fn;
}

exports.copy = copy;
function copy (fromFn, toFn) {
  toFn[SIGNATURE] = fromFn[SIGNATURE] || _parse(fromFn);
  return toFn;
}

/**
 * This code is adapted from the AngularJS v1 dependency injector
 */
function _parse (fn) {
  var fnText = fn.toString().replace(STRIP_COMMENTS, '');
  var argDecl = fnText.match(FN_ARGS);
  return argDecl[1].split(FN_ARG_SPLIT).map(function(arg){
    return arg.replace(FN_ARG, function(all, underscore, name){
      return name;
    });
  }).filter(Boolean);
}

var FN_ARGS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m;
var FN_ARG_SPLIT = /,/;
var FN_ARG = /^\s*(_?)(\S+?)\1\s*$/;
var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
var SIGNATURE = '__signature_' + require('hat')();

exports.parse = parse;
function parse (fn) {
  if (typeof fn !== 'function') {
    throw new TypeError("Not a function: " + fn);
  }
  if (!fn[SIGNATURE]) {
    fn[SIGNATURE] = _parse(fn);
  }
  return fn[SIGNATURE];
}

exports.clobber = clobber;
function clobber (fn, names) {
  fn[SIGNATURE] = names;
  return fn;
}

exports.copy = copy;
function copy (fromFn, toFn) {
  toFn[SIGNATURE] = fromFn[SIGNATURE] || _parse(fromFn);
  return toFn;
}

/**
 * This code is adapted from the AngularJS v1 dependency injector
 */
function _parse (fn) {
  var fnText = fn.toString().replace(STRIP_COMMENTS, '');
  var argDecl = fnText.match(FN_ARGS);
  return argDecl[1].split(FN_ARG_SPLIT).map(function(arg){
    return arg.replace(FN_ARG, function(all, underscore, name){
      return name;
    });
  }).filter(Boolean);
}

Remove noisy & pointless comment