store.js

import { useMemo } from 'react'
import { createStore, applyMiddleware } from 'redux'
import { composeWithDevTools } from '@redux-devtools/extension'

import reducers from './reducers'

let store

const initStore = preloadedState => createStore(reducers, preloadedState, composeWithDevTools(applyMiddleware()))

export const initializeStore = preloadedState => {
  let _store = store ?? initStore(preloadedState)

  // After navigating to a page with an initial Redux state, merge that state
  // with the current state in the store, and create a new store
  if (preloadedState && store) {
    _store = initStore({ ...store.getState(), ...preloadedState })

    // Reset the current store
    store = undefined
  }

  // For SSG and SSR always create a new store
  if (typeof window === 'undefined')
    return _store

  // Create the store once in the client
  if (!store)
    store = _store

  return _store
}

export const useStore = initialState => {
  const store =
    useMemo(
      () => initializeStore(initialState),
      [initialState],
    )

  return store
}