- core-js/client/shim - used for ES6 shims and polyfills. This is for
solving browser missing features etc.
- zone.js - used for creating isolated environments in Javascript, used
by Angular2.
- Reflect.js - ?
- systemjs - Used by angular for configuration, loading parts, and some
other stuff. I'm not that sure because I use webpack, but they fill the
same "spot" in the build.
as for `System.import('app')`, it tells System.js (or ES6 compatible
browser) to import your remote application code. This call will actually
load your code and bootstrap Angular2. it will return a promise, and we
use a `catch(...)` clause to handle any errors in importing or
boostrapping.
On Tuesday, November 29, 2016 at 2:55:32 AM UTC+2, foysal foysal wrote:
>
> I am learning angularjs 2. I am following this
> <https://github.com/angular/quickstart/blob/master/index.html> git repo.
> Here I got below codes in *index.html*.
>
> <script src="node_modules/core-js/client/shim.min.js"></script><script
> src="node_modules/zone.js/dist/zone.js"></script><script
> src="node_modules/reflect-metadata/Reflect.js"></script><script
> src="node_modules/systemjs/dist/system.src.js"></script><script
> src="systemjs.config.js"></script><script>
> System.import('app').catch(function(err){ console.error(err); });</script>
>
> Why these codes used in *index.html* ?
>
> What are the necessitys of including these JavaScript files ?
>
> What do they do here ?
>
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