@tanstack/query-core
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The framework agnostic core that powers TanStack Query
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{"version":3,"sources":["../../src/infiniteQueryObserver.ts"],"sourcesContent":["import { QueryObserver } from './queryObserver'\nimport {\n hasNextPage,\n hasPreviousPage,\n infiniteQueryBehavior,\n} from './infiniteQueryBehavior'\nimport type { Subscribable } from './subscribable'\nimport type {\n DefaultError,\n DefaultedInfiniteQueryObserverOptions,\n FetchNextPageOptions,\n FetchPreviousPageOptions,\n InfiniteData,\n InfiniteQueryObserverBaseResult,\n InfiniteQueryObserverOptions,\n InfiniteQueryObserverResult,\n QueryKey,\n} from './types'\nimport type { QueryClient } from './queryClient'\nimport type { Query } from './query'\n\ntype InfiniteQueryObserverListener<TData, TError> = (\n result: InfiniteQueryObserverResult<TData, TError>,\n) => void\n\nexport class InfiniteQueryObserver<\n TQueryFnData = unknown,\n TError = DefaultError,\n TData = InfiniteData<TQueryFnData>,\n TQueryData = TQueryFnData,\n TQueryKey extends QueryKey = QueryKey,\n TPageParam = unknown,\n> extends QueryObserver<\n TQueryFnData,\n TError,\n TData,\n InfiniteData<TQueryData, TPageParam>,\n TQueryKey\n> {\n // Type override\n subscribe!: Subscribable<\n InfiniteQueryObserverListener<TData, TError>\n >['subscribe']\n\n // Type override\n getCurrentResult!: ReplaceReturnType<\n QueryObserver<\n TQueryFnData,\n TError,\n TData,\n InfiniteData<TQueryData, TPageParam>,\n TQueryKey\n >['getCurrentResult'],\n InfiniteQueryObserverResult<TData, TError>\n >\n\n // Type override\n protected fetch!: ReplaceReturnType<\n QueryObserver<\n TQueryFnData,\n TError,\n TData,\n InfiniteData<TQueryData, TPageParam>,\n TQueryKey\n >['fetch'],\n Promise<InfiniteQueryObserverResult<TData, TError>>\n >\n\n constructor(\n client: QueryClient,\n options: InfiniteQueryObserverOptions<\n TQueryFnData,\n TError,\n TData,\n TQueryData,\n TQueryKey,\n TPageParam\n >,\n ) {\n super(client, options)\n }\n\n protected bindMethods(): void {\n super.bindMethods()\n this.fetchNextPage = this.fetchNextPage.bind(this)\n this.fetchPreviousPage = this.fetchPreviousPage.bind(this)\n }\n\n setOptions(\n options: InfiniteQueryObserverOptions<\n TQueryFnData,\n TError,\n TData,\n TQueryData,\n TQueryKey,\n TPageParam\n >,\n ): void {\n super.setOptions({\n ...options,\n behavior: infiniteQueryBehavior(),\n })\n }\n\n getOptimisticResult(\n options: DefaultedInfiniteQueryObserverOptions<\n TQueryFnData,\n TError,\n TData,\n TQueryData,\n TQueryKey,\n TPageParam\n >,\n ): InfiniteQueryObserverResult<TData, TError> {\n options.behavior = infiniteQueryBehavior()\n return super.getOptimisticResult(options) as InfiniteQueryObserverResult<\n TData,\n TError\n >\n }\n\n fetchNextPage(\n options?: FetchNextPageOptions,\n ): Promise<InfiniteQueryObserverResult<TData, TError>> {\n return this.fetch({\n ...options,\n meta: {\n fetchMore: { direction: 'forward' },\n },\n })\n }\n\n fetchPreviousPage(\n options?: FetchPreviousPageOptions,\n ): Promise<InfiniteQueryObserverResult<TData, TError>> {\n return this.fetch({\n ...options,\n meta: {\n fetchMore: { direction: 'backward' },\n },\n })\n }\n\n protected createResult(\n query: Query<\n TQueryFnData,\n TError,\n InfiniteData<TQueryData, TPageParam>,\n TQueryKey\n >,\n options: InfiniteQueryObserverOptions<\n TQueryFnData,\n TError,\n TData,\n TQueryData,\n TQueryKey,\n TPageParam\n >,\n ): InfiniteQueryObserverResult<TData, TError> {\n const { state } = query\n const parentResult = super.createResult(query, options)\n\n const { isFetching, isRefetching, isError, isRefetchError } = parentResult\n const fetchDirection = state.fetchMeta?.fetchMore?.direction\n\n const isFetchNextPageError = isError && fetchDirection === 'forward'\n const isFetchingNextPage = isFetching && fetchDirection === 'forward'\n\n const isFetchPreviousPageError = isError && fetchDirection === 'backward'\n const isFetchingPreviousPage = isFetching && fetchDirection === 'backward'\n\n const result: InfiniteQueryObserverBaseResult<TData, TError> = {\n ...parentResult,\n fetchNextPage: this.fetchNextPage,\n fetchPreviousPage: this.fetchPreviousPage,\n hasNextPage: hasNextPage(options, state.data),\n hasPreviousPage: hasPreviousPage(options, state.data),\n isFetchNextPageError,\n isFetchingNextPage,\n isFetchPreviousPageError,\n isFetchingPreviousPage,\n isRefetchError:\n isRefetchError && !isFetchNextPageError && !isFetchPreviousPageError,\n isRefetching:\n isRefetching && !isFetchingNextPage && !isFetchingPreviousPage,\n }\n\n return result as InfiniteQueryObserverResult<TData, TError>\n }\n}\n\ntype ReplaceReturnType<\n TFunction extends (...args: Array<any>) => unknown,\n TReturn,\n> = (...args: Parameters<TFunction>) => 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