I have this piece of code written in typescript for zustand state management library
export const useStore = <T, F>(
store: (callback: (state: T) => unknown) => unknown,
callback: (state: T) => F,
) => {
const result = store(callback) as F;
const [data, setData] = useState<F>();
useEffect(() => {
setData(result);
}, [result]);
return data;
};
how can I convert this piece of code to normal Context API code ?
Create an StoreContext.tsx
import React, { createContext, useContext, useState, useEffect, ReactNode } from 'react';
interface StoreContextType<T> {
state: T;
setState: React.Dispatch<React.SetStateAction<T>>;
}
const StoreContext = createContext<StoreContextType<any> | undefined>(undefined);
export const StoreProvider = <T,>({ children, initialState }: { children: ReactNode; initialState: T }) => {
const [state, setState] = useState<T>(initialState);
return (
<StoreContext.Provider value={{ state, setState }}>
{children}
</StoreContext.Provider>
);
};
create a custom hook
export const useStore = <T, F>(callback: (state: T) => F): F => {
const context = useContext(StoreContext);
if (!context) {
throw new Error('useStore must be used within a StoreProvider');
}
const { state, setState } = context as StoreContextType<T>;
const [data, setData] = useState<F>();
useEffect(() => {
const result = callback(state);
setData(result);
}, [state, callback]);
return data as F;
};
wrap the index file with store provider
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import { StoreProvider, initialState, AppState } from './StoreContext';
ReactDOM.render(
<React.StrictMode>
<StoreProvider<AppState> initialState={initialState}>
<App />
</StoreProvider>
</React.StrictMode>,
document.getElementById('root')
);
use the context in your relevant componenet
type AppState = {
count: number;
};
const initialState: AppState = {
count: 0,
};
const MyComponent = () => {
const count = useStore((state: AppState) => state.count);
return <div>Count: {count}</div>;
};