text: //// [noEmitHelpers2.ts]
  
  declare var decorator: any;
  
  @decorator
  class A {
      constructor(a: number, @decorator b: string) {
      }
  }
  
  //// [noEmitHelpers2.js]
  var A = (function () {
      function A(a, b) {
      }
      A = __decorate([
          decorator,
          __param(1, decorator), 
          __metadata('design:paramtypes', [Number, String])
      ], A);
      return A;
  })();
  