use new practice better emit helpers

Author: piotrwitek

jspm.config.js

@@ -146,7 +146,9 @@ SystemJS.config({
     "preserveConstEnums": true,
     "removeComments": true,
     "typeCheck": false,
-    "tsconfig": false
+    "tsconfig": false,
+    "noEmitHelpers": true,
+    "importHelpers": true
   },
   packages: {
     "app": {
@@ -552,4 +554,4 @@ SystemJS.config({
       }
     }
   }
-});
+});

src/tsconfig.json

@@ -16,8 +16,8 @@
     "allowJs": false,
     "allowSyntheticDefaultImports": false,
     "noEmitOnError": true,
-    "noEmitHelpers": false,
-    "importHelpers": false,
+    "noEmitHelpers": true,
+    "importHelpers": true,
     "experimentalDecorators": true,
     "emitDecoratorMetadata": true,
     "pretty": true,