Zust-API

zust-api is a lightweight, highly configurable state management solution built on top of Zustand. It offers advanced features such as:

• Deep State Updates: Easily update nested state properties using setDeep.
• Middleware & Plugins: Enhance your store with middleware functions and plugins.
• Persistence: Persist your state with advanced options:
  • Selective Persistence: Persist only specific keys (using dot-notation, e.g. user.profile.name).
  • Custom Storage Providers: Use localStorage, sessionStorage, or a custom storage adapter.
  • Versioning & Migration: Manage state schema changes with version numbers and migration functions.
  • Expiration: Set a maximum age (maxAge) for persisted data.
  • Custom Serialization: Override default JSON serialization/deserialization.
• Undo/Redo: Built-in undo/redo functionality to revert or reapply state changes.
• React Integration: Access your store via React hooks (useStore and useSelectors) for seamless UI updates.

This package is designed to be easily integrated into any React project and is reusable across multiple projects.

---

Features

• Deep State Updates:
  Update nested properties easily using the setDeep method.
• Middleware & Plugins:
  Extend your store with middleware and plugin support.
• Advanced Persistence:
  • Selective Persistence: Persist only the parts of the state you need.
  • Custom Storage Providers: Choose between localStorage, sessionStorage, or custom storage.
  • Versioning & Migration: Easily manage changes in your state structure.
  • Expiration: Automatically clear stale persisted data.
  • Custom Serialization: Override the default JSON behavior.
• Undo/Redo:
  Easily revert or reapply state changes with built-in undo/redo functions.
• React Integration:
  Use the useStore and useSelectors hooks to integrate state management into your React components.

---

Installation

Install zust-api using npm, bun, or Yarn:

npm install zust-api

or

yarn add zust-api

or

bun install zust-api

Usage

Here is a basic example of how to use Zust:

import { createStore, createPersistConfig } from "zust-api";

type MyTasks = { id: number; text: string; completed: boolean };

// Define the initial state
const initialState = {
  counter: 0,
  user: { name: "John Doe" as string, age: 30 },
  theme: "light" as "dark" | "light",
  todos: [] as MyTasks[],
  deepNested: { level1: { level2: { value: "Deep" as string } } },
};

// Create the store
const { useSelectors, setDeep } = createStore(initialState);

// Create the store with persistence
const { useSelectors, setDeep } = createStore(initialState, {
  persist: createPersistConfig("counter", "theme", "user.name"), // You can also pass `true` to persist the entire state.
  storageProvider: () => sessionStorage, // Optional: use a custom storage (e.g., sessionStorage). Default is localStorage
  version: 1, // Optional: version number for persisted state.
  migrate: async (persistedState, version) => {
    // Example migration: if an older version is detected, update the state.
    if (version < 1) {
      return {
        ...persistedState,
        user: { ...persistedState.user, migrated: true },
      };
    }
    return persistedState;
  },
  maxAge: 3600000, // Optional: expire persisted data after 1 hour (in milliseconds).
  serialize: JSON.stringify, // Optional: custom serialization.
  deserialize: JSON.parse, // Optional: custom deserialization.
});

 // You can now use the returned store API:
// For example:
console.log(store.getState());
store.setDeep("counter", (prev: number) => prev + 1);
store.undo();
store.redo();

// A modular setup would ideally export { useSelectors, useStore, setDeep } here.

export const ExampleComponent(): React.FC = () => {
  // Select state values
  const { name, age, theme } = useSelectors("user.name", "user.age", "theme");

  const [newName, setNewName] = React.useState("");
  const [newAge, setNewAge] = React.useState(age);

  // Update state values
  const updateUser = () => {
    if (newName.trim()) {
      setDeep("user.name", newName);
    }
    setDeep("user.age", newAge);
  };

  const toggleTheme = () =>
    setDeep("theme", (prev) => (prev === "light" ? "dark" : "light"));


  return (
    <div>
      <p>User Name: {name}</p>
      <p>Theme: {theme}</p>
      <button onClick={updateName}>Update User Name</button>
      <button onClick={toggleTheme}>Toggle Theme</button>
    </div>
  );
}

Accessing the Store in React

Using useStore

import React from 'react';
import { useStore } from from "../store"; // path to store logic

export function Counter() {
  // Access state, update functions, and undo/redo capabilities.
  const { counter, setDeep, undo, redo } = useStore();

  return (
    <div>
      <h2>Counter: {counter}</h2>
      <button onClick={() => setDeep('counter', (prev: number) => prev + 1)}>Increase</button>
      <button onClick={() => setDeep('counter', (prev: number) => prev - 1)}>Decrease</button>
      <button onClick={undo}>Undo</button>
      <button onClick={redo}>Redo</button>
    </div>
  );
}

Using useSelectors

Select only specific parts of the state:

import React from "react";
import { useSelectors } from "../store"; // path to store logic

export function UserInfo() {
  // Select the user's name from the state.
  const { name } = useSelectors("user.name");
  return <div>User Name: {name}</div>;
}

Undo/Redo Functionality

Each time setDeep updates the state, the previous state is saved in a history stack. Use undo() and redo() to navigate the state history:

<button onClick={undo}>Undo</button>
<button onClick={redo}>Redo</button>

---

Advanced Persistence Options

Selective Persistence

Persist only parts of the state using createPersistConfig:

// Persist only the "user" object and "settings.theme"
const persistOptions = createPersistConfig<typeof initialState>(
  "user",
  "settings.theme"
);

Custom Storage Provider

Use any Storage-compliant provider, such as sessionStorage:

const store = createStore(initialState, {
  persist: persistOptions,
  storageProvider: () => sessionStorage,
});

State Versioning & Migration

Version your state and provide a migration function:

const store = createStore(initialState, {
  persist: persistOptions,
  version: 1,
  migrate: async (persistedState, version) => {
    if (version < 1) {
      return {
        ...persistedState,
        user: { ...persistedState.user, migrated: true },
      };
    }
    return persistedState;
  },
});

Expiring Persisted Data

Set a maximum age for persisted data:

const store = createStore(initialState, {
  persist: persistOptions,
  maxAge: 3600000, // 1 hour in milliseconds
});

Custom Serialization/Deserialization

Override default JSON methods if needed:

const store = createStore(initialState, {
  persist: persistOptions,
  serialize: (data) => /* custom serialization logic */,
  deserialize: (str) => /* custom deserialization logic */,
});

---

Demo Application

A demo React application is included in the demo/ folder. It is built using Vite with the SWC-powered React plugin for fast builds.

Running the Demo

1. Install dependencies:

   yarn install

2. Start the demo server:

   yarn dev:demo

3. Testing

   Run tests to verify that state management, persistence, middleware, and undo/redo functionalities work as expected:

   yarn test
   
   

---

Contributing

Contributions are welcome! If you have ideas for improvements, additional features, or bug fixes, please open an issue or submit a pull request.

---

License

This project is licensed under the MIT License.

Enjoy building with zust-api!