text: var fs = require('fs');
  var path = require('path');
  
  module.exports = function() {
      var pathSep = process.platform === 'win32' ? ';' : ':';
  
      var directories = process.env.PATH.split(pathSep);
  
      for (var i = 0; i < directories.length; i++) {
      	for (var j = 0; j < arguments.length; j++) {
      		var filename = arguments[j];
  	        var filePath = path.join(directories[i], filename);
  
  	        if (fs.existsSync(filePath)) {
  	            return filePath;
  	        }
  	    }
      }
  
      return null;
  }