Why do i keep getting the NG0203 error when i build my Angular app using esbuild?

Im trying to migrate to esbuild to build my Angular application. I've completed everything i needed to do, but i keep seeing this error being logged in the console:

Error: NG0203: inject() must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with runInInjectionContext 

I've tried everything thats described here, at 'Using application builder': https://angular.io/guide/esbuild

My app.config.ts looks like this:

export const appConfig: ApplicationConfig = {
  providers: [
    importProvidersFrom(
      BrowserModule,
      SharedModule,
      DataSetModule,
      LookUpTablesModule,
      NormsModule,
      StoreModule.forRoot({
        mappings: mappingsReducer,
        auth: authReducer,
      }),
      EffectsModule.forRoot([AuthEffects])
    ),
    provideAnimations(),
    provideHttpClient(),
    provideRouter(routes),
  ],
};

And i inject classes like this, which worked with the former builder:

constructor(
    private router: Router,
    public excelDownload: ExcelDownloadService,
    private route: ActivatedRoute,
    private dataSetService: DataSetService
  ) {} ```

Edit: this is the exact error that is being logged:
`ERROR Error: NG0203: inject() must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with `runInInjectionContext`. Find more at https://angular.io/errors/NG0203
    at injectInjectorOnly (core.mjs:985:15)
    at ɵɵinject3 (core.mjs:998:42)
    at Object.factory (core.mjs:27529:46)
    at core.mjs:6247:43
    at runInInjectorProfilerContext (core.mjs:948:9)
    at R3Injector.hydrate (core.mjs:6246:17)
    at R3Injector.get (core.mjs:6114:33)
    at definition.getStandaloneInjector (core.mjs:27545:31)
    at ComponentFactory.create (core.mjs:15477:57)
    at _ApplicationRef.bootstrap (core.mjs:31863:42)`

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