fix(useAsyncStorage): make more robust #760
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@@ -61,3 +61,4 @@ buck-out/ | |
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| # builds by bob | ||
| lib/ | ||
| coverage | ||
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| @@ -0,0 +1,84 @@ | ||
| /** | ||
| * @format | ||
| */ | ||
| /* eslint-disable no-shadow */ | ||
| import { renderHook, act } from '@testing-library/react-hooks'; | ||
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| import AsyncStorage, { useAsyncStorage } from '../src'; | ||
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| afterEach(AsyncStorage.clear); | ||
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| function expectStableCallbacks(result: any, rerender: () => void) { | ||
| const previousFunctions = Object.values(result.current).filter( | ||
| (item) => typeof item === 'function' | ||
| ); | ||
| rerender(); | ||
| const nowFunctions = Object.values(result.current).filter( | ||
| (item) => typeof item === 'function' | ||
| ); | ||
| expect(nowFunctions).toHaveLength(previousFunctions.length); | ||
| expect(nowFunctions).toEqual(previousFunctions); | ||
| } | ||
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| describe('useAsyncStorage', () => { | ||
| it('should export only stable output', async () => { | ||
| const { result, rerender } = renderHook(() => useAsyncStorage('key')); | ||
| expect(result.error).toBeUndefined(); | ||
| expectStableCallbacks(result, rerender); | ||
| }); | ||
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| it('can read/write data to/from storage', async () => { | ||
| const newData = Math.floor(Math.random() * 1000).toString(); | ||
| const { result } = renderHook(() => useAsyncStorage('key')); | ||
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| await result.current.setItem(newData); | ||
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| const data = await result.current.getItem(); | ||
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| expect(data).toBe(newData); | ||
| }); | ||
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| it('can remove from storage', async () => { | ||
| await AsyncStorage.setItem('key', 'value'); | ||
| const { result } = renderHook(() => useAsyncStorage('key')); | ||
| await act(() => result.current.removeItem()); | ||
| expect(await AsyncStorage.getItem('key')).toBeNull(); | ||
| }); | ||
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| it.skip('should throw when mergeItem is not supported', async () => { | ||
| const { result } = renderHook(() => useAsyncStorage('key')); | ||
| const mergeItem = AsyncStorage.mergeItem; | ||
| delete AsyncStorage.mergeItem; | ||
| expect(result.current.mergeItem({})).rejects.toThrow(); | ||
| AsyncStorage.mergeItem = mergeItem; | ||
| }); | ||
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| it('can use merge with current data in storage', async () => { | ||
| let originalPerson = { | ||
| name: 'Jerry', | ||
| age: 21, | ||
| characteristics: { | ||
| hair: 'black', | ||
| eyes: 'green', | ||
| }, | ||
| }; | ||
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| const { result } = renderHook(() => useAsyncStorage('person')); | ||
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| await result.current.setItem(JSON.stringify(originalPerson)); | ||
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| originalPerson.name = 'Harry'; | ||
| originalPerson.characteristics.hair = 'red'; | ||
| // @ts-expect-error | ||
| originalPerson.characteristics.shoeSize = 40; | ||
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| await result.current.mergeItem(JSON.stringify(originalPerson)); | ||
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| const currentPerson = await result.current.getItem(); | ||
| const person = JSON.parse(currentPerson); | ||
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| expect(person).toHaveProperty('name', 'Harry'); | ||
| expect(person.characteristics).toHaveProperty('hair', 'red'); | ||
| expect(person.characteristics).toHaveProperty('shoeSize', 40); | ||
| }); | ||
| }); | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,13 +1,35 @@ | ||
| import React from 'react'; | ||
| import AsyncStorage from './AsyncStorage'; | ||
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| export function useAsyncStorage(key: string) { | ||
| const getItem = React.useCallback( | ||
| (...args) => AsyncStorage.getItem(key, ...args), | ||
| [key] | ||
| ); | ||
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| const setItem = React.useCallback( | ||
| //@ts-ignore | ||
|
There was a problem hiding this comment. We shouldn't add any There was a problem hiding this comment. Yes its required because TS complains: |
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| (...args) => AsyncStorage.setItem(key, ...args), | ||
| [key] | ||
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There was a problem hiding this comment. Do we have to create a new array for each of the callbacks? Can we create it once and reuse? There was a problem hiding this comment. No, this doesn't work. Eslint will complain: const dep = [key]
const getItem = React.useCallback(
(...args) => AsyncStorage.getItem(key, ...args),
dep
); |
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| ); | ||
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| const mergeItem = React.useCallback( | ||
| (...args) => | ||
| //@ts-ignore | ||
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There was a problem hiding this comment. We shouldn't add any |
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| AsyncStorage.mergeItem?.(key, ...args) ?? | ||
| Promise.reject('Not implemented'), | ||
| [key] | ||
| ); | ||
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| const removeItem = React.useCallback( | ||
| (...args) => AsyncStorage.removeItem(key, ...args), | ||
| [key] | ||
| ); | ||
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| return { | ||
| getItem, | ||
| setItem, | ||
| mergeItem, | ||
| removeItem, | ||
| }; | ||
| } | ||
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Why is this ESLint disable necessary?