types.js

var supported = [
  {
    name: 'Html',
    regex: /\.(html?)/gi
  },{
    name: 'Css',
    regex: /\.(css)/gi
  },{
    name: 'Js',
    regex: /\.(js)/gi
  },{
    name: 'Swf',
    regex: /\.(swf)/gi
  },{
    name: 'Img',
    regex: /\.(gif|png|jpe?g|bmp)/gi
  }
];

var pub = {};

function makeTypes(done) {
  if (supported.length > 0) {
    var type = supported.shift()
    pub['is' + type.name] = function(val) {
      var match = val.match(type.regex);
      return (match ? match.length > 0 : false);
    };
    makeTypes(done);
  } else {
    done(pub);
  }
}

makeTypes(function(types) {
  module.exports = types;
});