Custom feature for resetting signal store to initial state

[dquirion]

I would like to know if there a way of reseting to initial state all signal store as the metareducer did with Redux Store.

Previous way with redux store:

export function logoutClearState(reducer) {
    return function (state, action) {
        if (action.type === ActionTypes.LOGOUT) {
            state = undefined;
        }
        return reducer(state, action);
    };
}

@NgModule({
    imports: [
        StoreModule.forRoot(reducers, { metaReducers: [logoutClearState] }),
    ],
    declarations: [],
    providers: [],
})

I planned of using a custom feature like this:

export function withReset() {
  return signalStoreFeature(
    withHooks(store => ({
      onInit: () => {
        const auth = inject(AuthService);
        auth.isLogged()
          .pipe(filter(logged => !logged))
          .subscribe(() => {
            patchState(store, undefined);
          });
      }
    }))
  );
}

but using undefined in patch store is ignored.

Another solution could be to provide the feature a method initialState to call patchState with:

export function withReset() {
  return signalStoreFeature(
    { state: type<T>(), methods: type<{ initialState(): T }>() },
    withHooks(store => ({
      onInit: () => {
        const auth = inject(AuthService);
        auth.isLogged()
          .pipe(filter(logged => !logged))
          .subscribe(() => {
            patchState(store, store.initialState());
          });
      }
    }))
  );
}

Still, i feel that a proper way to reset to initial state would be simpler and better.

[rainerhahnekamp]

I'd say a combination of that #4574 (comment) and #4580 might be a proper solution?

So a reset feature which could be triggered by an event