How to import scripts from node_modules folder

I'm trying to get an ASP.NET Core application to run with Angular 2.0 following a tutorial. After a few steps in I realized it did not work when I try to work on it without an internet connection (I'm usually working on it while I'm sitting in a train). Of course the imports suggested by the tutorial won't work without an internet connection:

<script src="https://code.angularjs.org/2.0.0-beta.1/angular2-polyfills.js"></script>
<script src="https://code.angularjs.org/tools/system.js"></script>
<script src="https://code.angularjs.org/2.0.0-beta.1/Rx.js"></script>
<script src="https://code.angularjs.org/2.0.0-beta.1/angular2.dev.js"></script>


Thus, I tried to include the local files from my node_modules folder like this:

<script src="node_modules/angular2/bundles/angular2-polyfills.js"></script>
<script src="node_modules/systemjs/dist/system.js"></script>
<script src="node_modules/rxjs/Rx.js"></script>
<script src="node_modules/angular2/bundles/angular2.dev.js"></script>


The files exist and are correct. But when I try to debug the project I'll get the following error for all four files:

SyntaxError: missing ; before statement
​

When I look at the files via browser, all I receive is files with Hello World! written in it. I obviously seem to be missing something but as I've never worked with the whole npm part before, I have no idea why this would happen and after googling for hours nobody else seems to have that problem.

Is it access restriction? Missing JS module? Can anyone explain how I can include files from my node_modules folder in my HTML?

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