zustand-slice-factory 🐻🍕🏭

A light-weight package with generic factory functions for common slice data structures

Inspired by redux-slice-factory 🍕🏭

Install 💾

npm install zustand-slice-factory

What's the goal? 🏆

This package will

• provide a more opinionated zustand experience
• provide build-in support for async workflow
• save you time & effort

What's a Slice? 🍕

A slice is a bundle of everything associated to a piece of zustand state { name, selectors, state, actions }

the name is the domain the slice is responsible for the selectors exposes functions to read data for state the state is the initial state used in the create method from zustand the action actions to be store along with state

Why use Slices?

Read this if you want to learn more

What's Included?

• createModelSlice() create a slice for a single synchronous model
• createEntitySlice() create a slice for a collection of synchronous entities
• createAsyncModelSlice() create a slice for a single asynchronous model with request information
• createAsyncEntitySlice() create a slice for a collection of asynchronous entities with request information

Why differentiate between async/sync slices?

• Not every slice needs to track request information (i.e. UI data like Menus, Alert etc.)
• Reduce amount of unused information in the store
• SyncSlice can be easily extends into AsyncSlice if need be.

Show Me the Code...

Zustand (with Hooks)

type UserProfileSliceActions = AsyncModelSliceStateActions<UserProfileModel> & {
  get: Action<[string], Promise<void>>;
};

type UserProfileModelState = AsyncModelSliceState<UserProfileModel, Error, UserProfileSliceActions>;

const slice = createAsyncModelSlice<AppState, UserProfileModel, Error, UserProfileSliceActions>({
  name: 'UserProfile',
  selectSliceState: (appState) => appState.UserProfile,
});

// Create your own actions
const get: SetAction<AppState, [string], Promise<void>> = (set) => async (id) => {
  slice.actions.setStatus(set)(StatusEnum.Requesting);
  slice.actions.setError(set)(null);
  try {
    const response = await getUser(id); 
    slice.actions.hydrate(set)(response);
    slice.actions.setStatus(set)(StatusEnum.Settled);
  } catch (error) {
    slice.actions.setStatus(set)(StatusEnum.Failed);
    slice.actions.setError(set)(error as Error);
  }
};

const allActions = {
  ...slice.actions,
  get,
};

// Create final slice state that will be saved to the store
const createUserProfileSlice = (set: SetState<AppState>) => createAsyncModelSliceState<AppState, UserProfileModel, Error, UserProfileSliceActions>(
  set,
  slice.state,
  allActions
);

const UserProfileDuck = {
  create: createUserProfileSlice,
  name: slice.name,
  selectors: slice.selectors,
};

type AppState = {
  UserProfile: AsyncModelSliceState<UserProfileModel, Error, UserProfileSliceActions>
};

const useStore = create<AppState>((set) => ({
  UserProfile: UserProfileDuck.create(set),
}));

const UserProfile: React.FC = () => {
   const userActions = useStore(slice.selectors.selectActions);
   const userModelState = useStore(slice.selectors.selectStateSlice);

   useEffect(() => {
      userActions.set({
         username: '[email protected]',
         url: 'https://github.com/kevineaton603',
         roles: [UserRoleEnum.Premium],
      })
   }, [])
   return(<div>{userModelState.model.username}</div>)
}

Zustand Vanilla (without Hooks)

...

const useStore = create<AppState>((set) => ({
  UserProfile: UserProfileDuck.create(set),
}));

const { UserProfile } = store.getState();
UserProfile.actions.set({
   username: '[email protected]',
   url: 'https://github.com/kevineaton603',
   roles: [UserRoleEnum.Premium],
});