polymate-utils.html

<link rel="import" href="../polymer/polymer.html">

<script>
  (() => {

    PolymateUtils = function(superClass) {
      return class extends superClass {

        /**
         * @desc check if object is empty
         * @param {Object} object
         * @return {Boolean} empty
         */
        isEmpty(obj) {
          for (var prop in obj) {
            if (obj.hasOwnProperty(prop)) return false;
          }

          return true;
        }
      }
    }

  })();
</script>