InjectionToken<T> is poorly typed

[waterplea]

Which @angular/* package(s) are the source of the bug?

core

Is this a regression?

No

Description

Issue

I have made a function that expects a particular value from DI, say:

function getNumber(token: ProviderToken<number>): number {
  return inject(token);
}

There is no type error if I try to call it with following token:

const token = new InjectionToken<string>('');

Proposition

This happens because <T> in InjectionToken is only used inside factory function that you can pass inside constructor. I suggest we add a dummy prop inside InjectionToken class to protect against this issue:

/** @internal */
private readonly _guard!: T;

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/stackblitz-starters-crs76u

Please provide the exception or error you saw

No type error when using `InjectionToken` of a wrong type

Please provide the environment you discovered this bug in (run ng version)

17.2.0

Anything else?

No response

[JoostK]

Closing as a duplicate of #46815

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