Commits on Mar 9, 2022

1. Created a typescript utility type to extract the target (generic) typ… …

   …e of an injection token.
   
   This allows to write injected dependencies like:
   - given the following injection token:
   ```ts
   const MyToken = new InjectionToken<Promise<Array<string | number>>>('my-token');
   ```
   
   you can write:
   ```ts
   type MyTokenTargetType = InjectionTokenTargetType<typeof MyToken>;
   
   class MyClass {
     constructor(@Inject(MyToken) someField: MyTokenTargetType) {}
   }
   ```
   
   instead of:
   
   ```ts
   const MyToken = new InjectionToken<Promise<Array<string | number>>>('my-token');
   
   class MyClass {
     constructor(@Inject(MyToken) someField: Promise<Array<string | number>>) {}
   }
   ```

   Ghislain Thau committed Mar 9, 2022
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