zustand.js

// 1 install
npm install zustand

// 2 create
// store.js
import { create } from 'zustand';

const useStore = create((set) => ({
  count: 0, // Initial state
  increase: () => set((state) => ({ count: state.count + 1 })),
  decrease: () => set((state) => ({ count: state.count - 1 })),
}));
export default useStore;

// 3 use
// App.js
import React from 'react';
import useStore from './store';

const Counter = () => {
  const { count, increase, decrease } = useStore((state) => ({
    count: state.count,
    increase: state.increase,
    decrease: state.decrease,
  }));
  return (
    <div>
      <h1>Count: {count}</h1>
      <button onClick={increase}>Increase</button>
      <button onClick={decrease}>Decrease</button>
    </div>
  );
};
export default Counter;


//4 optional - middleware
import { create } from 'zustand';
import { persist } from 'zustand/middleware';

const useStore = create(
  persist(
    (set) => ({
      count: 0,
      increase: () => set((state) => ({ count: state.count + 1 })),
    }),
    { name: 'counter-storage' } // Key for localStorage
  )
);
export default useStore;