gruntfile.js

grunt.registerMultiTask('pack', function() {
    var objects = {
      "meta": {
        "generated": Date.now(),
        "version": "1.0",
        "app": "Pumpkinator Asset Packer",
        "url": "http://some.url",
        "copyright": "Hyfn 2015"
      }
    };
    var imageObj = {
      //   Loads an Image
      "type": "image",
      "key": "ball",
      "url": "assets/sprites/shinyball.png",
      "overwrite": true
    };
    this.filesSrc.forEach(function(filepath) {
      var matches = filepath.match(/\.\/src\/images\/anims\/(\S+)\/(\S+)/);
      var objName = _.kebabCase(matches[1]);
      var img = _.assign({}, imageObj, {key: _.kebabCase(matches[2].split('.')[0]), url:filepath.replace('./src/','')});
      if(!objects[objName]) {
        objects[objName] = [];
      }

      objects[objName].push(img);
    });

    var json = JSON.stringify(objects, null, 2);
    json = json.replace(/^( *)"(\w+)"/gm, '$1$2').replace(/"/gm, '\'').replace(/(\'images\S+\')/gm, 'require($1)');
    grunt.file.write('src/creator/packs/anims.js', 'module.exports = ' + json);
  });