44 lines
1.1 KiB
TypeScript
44 lines
1.1 KiB
TypeScript
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import { useCallback, useEffect, useRef, useState } from "react"
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import AsyncStorage from "@react-native-async-storage/async-storage"
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type UseLocalStorageResult<T> = [T, React.Dispatch<React.SetStateAction<T>>]
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export const useLocalStorage = <T extends unknown>(
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key: string,
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defaultValue: T,
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): UseLocalStorageResult<T> => {
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const hasSaved = useRef(false)
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const [value, setValue] = useState<T>(defaultValue)
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const getFromLocalStorage = useCallback(async (): Promise<T> => {
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const value = await AsyncStorage.getItem(key)
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hasSaved.current = true
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if (value == null) {
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return defaultValue
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}
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return JSON.parse(value) as T
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}, [key, defaultValue])
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useEffect(() => {
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if (!hasSaved.current) {
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return
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}
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AsyncStorage.setItem(key, JSON.stringify(value)).catch((error) => {
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console.error(error)
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})
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}, [key, value])
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useEffect(() => {
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getFromLocalStorage()
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.then((value) => {
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setValue(value)
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})
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.catch((error) => {
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setValue(defaultValue)
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console.error(error)
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})
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}, [defaultValue, getFromLocalStorage])
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return [value, setValue]
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}
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