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| import React, { useMemo, useContext, createContext } from "react" | |
| import { useImmer } from "use-immer" | |
| const initialState = { | |
| count: 0 | |
| } | |
| function makeStore() { | |
| const Context = createContext() | |
| const stateFromStorage = () => | |
| JSON.parse(localStorage.getItem("state")) || initialState | |
| const Provider = ({ children }) => { | |
| const [state, setState] = useImmer(stateFromStorage) | |
| useMemo(() => localStorage.setItem("state", JSON.stringify(state)), [state]) | |
| const contextValue = { | |
| state, | |
| setState | |
| } | |
| return <Context.Provider value={contextValue}>{children}</Context.Provider> | |
| } | |
| const useStore = () => useContext(Context) | |
| return { | |
| Provider, | |
| useStore | |
| } | |
| } | |
| export default makeStore() |
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