带有通用类型 TypeScript 的自定义钩子

I have a problem with making interfaces to my custom hook usePagination. I need a help to create this hook as generic, because the interface User does'nt relate to rest of interfaces in this moment. dataEntries are array of users with id, firstName and lastName. ElementsOnPage is set to 50 as default.function usePagination(dataEntries,elementsOnPage = 50) { const [actualPageIdx, setActualPageIdx] = useState(1) const lastPageIdx = Math.ceil(dataEntries.length / elementsOnPage) const [isBusy, setIsBusy] = useState(false) const timeoutRef = useRef<any>(null) useEffect(() => { setIsBusy(true) if (timeoutRef.current) { clearTimeout(timeoutRef.current) } timeoutRef.current = setTimeout(() => { setIsBusy(false) }, 333) }, [actualPageIdx]) const entriesOnSelectedPage = () => { const firstEntry = (actualPageIdx - 1) * elementsOnPage const lastEntry = firstEntry + elementsOnPage console.log(dataEntries.slice(firstEntry, lastEntry)) return dataEntries.slice(firstEntry, lastEntry) } const goToFirstPage = useCallback(() => { setActualPageIdx(1) }, []) const goToLastPage = () => { setActualPageIdx(lastPageIdx) } const goToPage = (page: number) => { setActualPageIdx(page) } const goToPrevPage = () => { setActualPageIdx((actualPageIdx) => (actualPageIdx === 1 ? actualPageIdx : actualPageIdx - 1)) } const goToNextPage = () => { setActualPageIdx((actualPageIdx) => actualPageIdx === lastPageIdx ? actualPageIdx : actualPageIdx + 1 ) } return [ { actualPageIdx, lastPageIdx, entriesOnSelectedPage, isBusy }, { goToFirstPage, goToPrevPage, goToPage, goToNextPage, goToLastPage, }, ]}I have tried to do sth like this:interface User { id: number firstName: string lastName: string}interface PaginationState { lastPageIdx: number actualPageIdx: number entriesOnSelectedPage: () => User[] isBusy: boolean}interface PaginationActions { goToFirstPage: () => void goToPrevPage: () => void goToNextPage: () => void goToLastPage: () => void goToPage: (number: number) => void}but rather I would like to retrieve sth like this using generic types:function usePagination<T>(dataEntries: T[], elementsOnPage = 50): [PaginationState, PaginationActions] { return [ { actualPageIdx, lastPageIdx, entriesOnSelectedPage, isBusy }, { goToFirstPage, goToPrevPage, goToPage, goToNextPage, goToLastPage, }, ]} 解决方案 You almost have it. You just have to make your PaginationState interface generic:interface PaginationState<T> { lastPageIdx: number actualPageIdx: number entriesOnSelectedPage: () => T[] isBusy: boolean}And then pass T to PaginationState in your usePagination function.function usePagination<T>( dataEntries: T[], elementsOnPage = 50): [PaginationState<T>, PaginationActions] { //...}Now usePagination can infer it's generic type and pass it along through to PaginationState<T>const users: User[] = []const [state, action] = usePagination(users) // state has type PaginationState<User>Playground 这篇关于带有通用类型 TypeScript 的自定义钩子的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！