1_before.js

import {Component as _Component, Template as _Template} from 'angular2/src/core/annotations/annotations';

function makeDecorator(annotationClass) {
  return (options) => {
    return (klass) => {
      klass.annotations = klass.annotations || [];
      klass.annotations.push(new annotationClass(options));
      return klass;
    };
  };
}

const Component = makeDecorator(_Component);
const Template = makeDecorator(_Template);

@Component({
  selector: 'hello'
})
@Template({
  inline: '<p>Hello, World!</p>'
})
class HelloComponent {
}

2_after.js

"use strict";

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

var _angular2SrcCoreAnnotationsAnnotations = require("angular2/src/core/annotations/annotations");

var _Component = _angular2SrcCoreAnnotationsAnnotations.Component;
var _Template = _angular2SrcCoreAnnotationsAnnotations.Template;

function makeDecorator(annotationClass) {
  return function (options) {
    return function (klass) {
      klass.annotations = klass.annotations || [];
      klass.annotations.push(new annotationClass(options));
      return klass;
    };
  };
}

var Component = makeDecorator(_Component);
var Template = makeDecorator(_Template);

var HelloComponent = (function () {
  function HelloComponent() {
    _classCallCheck(this, HelloComponent);
  }

  HelloComponent = Component({
    selector: "hello"
  })(HelloComponent) || HelloComponent;
  HelloComponent = Template({
    inline: "<p>Hello, World!</p>"
  })(HelloComponent) || HelloComponent;
  return HelloComponent;
})();