Dependency Injection - consider alternative for resolving TypeScript interfaces

Relevant Package

This feature request is for @angular/core

Description

DI can’t handle TypeScript interfaces

Describe the solution you’d like

I noticed Aurelia has an interesting solution using Symbols for unique injection tokens to allow slick resolving of interfaces.

Described here

Describe alternatives you’ve considered

the current workaround is to use TypeScript abstract classes.

[ShawnTalbert]

Thanks @nzacca. Yes, I looked briefly at InjectionToken and I presume it would be an ingredient in the solution?

My point is it feels like Aurelia’s approach fairly cleanly hides the details from the application programmer and it would be nice if Angular could provide a similar (or better!) API.

I like how they have done rather minimal boilerplate and it allows a traditional IFoo -> Foo type registration, as shown at the end of the section linked above.

As far as I can tell, Angular’s answer to this erased-interface problem is abstract classes. I’m hoping they will consider this technique and/or improve upon it to give us a more natural feeling interface-to-concrete DI experience.

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