@Laurensvdw looks like that problem exists for all functions.
I'm using ngrx signal store and there are a lot of functions with injected TranslateService instance. Unfortunately, everything is ignored by the extract tool.

This is happening because the service parser checks only inside class declarations. I did an attempt to extend it and see if it would have been easy to parse function expressions but while it looked that it worked it fell apart in some edge cases. For example, from the code below it extracted the ' , ' from the join instead of the translation.key

export const errorInterceptor: HttpInterceptorFn = (req, next) => {
  const translateService = inject(TranslateService);
  const router = inject(Router);

  translateService.instant('translation.key').join(', ');
};

I will give it another try when I find some more time to check it out.

This is now published as a pre-release v9.2.0-next.0, under the "next" tag. Let me know any feedback once you have tried it on your code base and all being well, I'll do a general release.

I would gladly test this but the client's apps are still on Angular 16, being 8.x of this package 😭 Quite an important detail I forgot to mention... So move along, we'll update probably during the summer. 😨 As LTS is 8 Nov. 2024 for ng16