
We should not migrate the reference from `useExisting`. This is because developers can only use the `useExisting` value as a token. e.g. ```ts @NgModule({ providers: [ {provide: AppRippleConfig, useValue: rippleOptions}, {provide: MAT_RIPPLE_OPTIONS, useExisting: AppRippleConfig}, ] }) export class AppModule {} ``` In the case above, nothing should be decorated with `@Injectable`. The `AppRippleConfig` class is just used as a token for injection. PR Close #33286
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