Thank you for the reply, but I am still confused. My package.json is almost 
the same as yours:

"dependencies": {
    "angular2": "^2.0.0-alpha.54",
    "bootstrap": "^3.3.6",
    "jquery": "^2.1.4",
    "moment": "^2.10.6",
    "systemjs": "^0.19.6",
    "es6-promise": "^3.0.2",
    "es6-shim": "^0.33.3",
    "reflect-metadata": "^0.1.2",
    "rxjs": "^5.0.0-alpha.14",
    "zone.js": "^0.5.8"
  },
  "devDependencies": {
    "del": "^2.2.0",
    "gulp": "^3.9.0",
    "gulp-live-server": "^0.0.29",
    "gulp-sourcemaps": "^1.6.0",
    "gulp-tslint": "^3.6.0",
    "gulp-typescript": "^2.10.0",
    "concurrently": "^1.0.0",
    "typescript": "^1.7.3"
  }

I am not clear what does it mean "*those external dependencies can be 
easily loaded into a browser using angular2-polyfills.js*"
I didn't see you using this library in any of your examples.
Thank you again for your help.


On Tuesday, December 15, 2015 at 10:46:19 AM UTC-5, Pawel Kozlowski wrote:
>
> Nope, this is related to this breaking change in alpha.54 
> (
> https://github.com/angular/angular/blob/master/CHANGELOG.md#200-alpha54-2015-12-15):
>  
>
>
> "Previously angular2.js, angular2.min.js and angular2.dev.js bundles 
> would have zone.js and reflect-metadata pre-appended. New bundles 
> don't contain zone.js nor reflect-metadata - those external 
> dependencies can be easily loaded into a browser using 
> angular2-polyfills.js" 
>
> Example projects that work correctly with alpha.54: 
> ES5: https://github.com/pkozlowski-opensource/ng2-es5-play 
> SystemJS loader: https://github.com/pkozlowski-opensource/ng2-play 
> WebPack: https://github.com/angular/angular2-seed 
>
> Cheers, 
> Pawel 
>
>
> On Tue, Dec 15, 2015 at 4:32 PM, JG <[email protected] <javascript:>> 
> wrote: 
> > just upgraded to ng2 alpha 54. getting "Uncaught reflect-metadata shim 
> is 
> > required when using class decorators". Guess it's related to "RxJS needs 
> to 
> > be loaded explicitly" but not sure how to "load" it. 
> > 
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>
> -- 
> AngularJS book: 
> http://www.packtpub.com/angularjs-web-application-development/book 
> Looking for bootstrap-based widget library for AngularJS? 
> http://angular-ui.github.com/bootstrap/ 
>

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