webpack+angular2 error: Uncaught ReferenceError: __decorate is not defined

remove from tsconfig.json

"declaration": true,
"noEmitHelpers": false,
"isolatedModules": false

This happened to me when creating the code sharing NativeScript https://docs.nativescript.org/angular/code-sharing/intro

but I only had to coment out this 2 lines:

    //"declaration": false,  
    //"noEmitHelpers": true,