POC of IoC compiler for Angular DI providers
$ npm install$ npm run compile
See /src/test folder at *.compiled.ts files
Angular application is platform independent, meaning that we can target multiple platforms with one codebase.
But different platform are different - so they require different implementations of the same things (views, services etc.).
So we need a robust way of injecting right things for right target platforms and Angular provides for us necessary tool - Dependency Injection. That is great and powerful tool but when it comes to targeting multiple platforms we end up with having multiple providers for each of the platform.
And you have to provide all tokens your application require for each platform to work properly. But you can easily make a mistake or even forget to provide one or few tokens for some platform and you will only know about it when you actually run the app on that platform and see it crashes.
Wouldn't that be great to see this kind of errors ahead of time, because you already know which tokens your app needs?
That is where this compiler comes into the game - it allows you to couple token with exact interface which particular implementation should implement and gives you static analisys (thanks to Typescript) if something is missing or implementation does not satisfy token requirement.
But of course this is custom format of storing providers and it works fine with JIT compilation strategy of Angular but it fails with AOT - because Angular compiler is unable to locate those providers at compile time. So we need a way to precomile this to the normal list of Angular providers so that NGC can use it as usual.
Please have a look into /src/test folder where you can find what excatly happening at compilation time.