공부기록, 2021-08-31(recoil persist)

- recoil persist 저장방식
```
import { atom, RecoilRoot, useRecoilState } from 'recoil'
import { recoilPersist } from 'recoil-persist'

const { persistAtom } = recoilPersist()

const counterState = atom({
key: 'count',
default: 0,
effects_UNSTABLE: [persistAtom],
})
```