react-query/es/core/infiniteQueryBehavior.js

Hooks for managing, caching and syncing asynchronous and remote data in React

import { getAbortController } from './utils';
export function infiniteQueryBehavior() {
  return {
    onFetch: context => {
      context.fetchFn = () => {
        var _context$fetchOptions, _context$fetchOptions2, _context$fetchOptions3, _context$fetchOptions4, _context$state$data, _context$state$data2, _context$signal;

        const refetchPage = (_context$fetchOptions = context.fetchOptions) == null ? void 0 : (_context$fetchOptions2 = _context$fetchOptions.meta) == null ? void 0 : _context$fetchOptions2.refetchPage;
        const fetchMore = (_context$fetchOptions3 = context.fetchOptions) == null ? void 0 : (_context$fetchOptions4 = _context$fetchOptions3.meta) == null ? void 0 : _context$fetchOptions4.fetchMore;
        const pageParam = fetchMore == null ? void 0 : fetchMore.pageParam;
        const isFetchingNextPage = (fetchMore == null ? void 0 : fetchMore.direction) === 'forward';
        const isFetchingPreviousPage = (fetchMore == null ? void 0 : fetchMore.direction) === 'backward';
        const oldPages = ((_context$state$data = context.state.data) == null ? void 0 : _context$state$data.pages) || [];
        const oldPageParams = ((_context$state$data2 = context.state.data) == null ? void 0 : _context$state$data2.pageParams) || [];
        const abortController = getAbortController();
        const abortSignal = abortController == null ? void 0 : abortController.signal;
        let newPageParams = oldPageParams;
        let cancelled = false; // Get query function

        const queryFn = context.options.queryFn || (() => Promise.reject('Missing queryFn'));

        const buildNewPages = (pages, param, page, previous) => {
          newPageParams = previous ? [param, ...newPageParams] : [...newPageParams, param];
          return previous ? [page, ...pages] : [...pages, page];
        }; // Create function to fetch a page


        const fetchPage = (pages, manual, param, previous) => {
          if (cancelled) {
            return Promise.reject('Cancelled');
          }

          if (typeof param === 'undefined' && !manual && pages.length) {
            return Promise.resolve(pages);
          }

          const queryFnContext = {
            queryKey: context.queryKey,
            signal: abortSignal,
            pageParam: param,
            meta: context.meta
          };
          const queryFnResult = queryFn(queryFnContext);
          const promise = Promise.resolve(queryFnResult).then(page => buildNewPages(pages, param, page, previous));
          return promise;
        };

        let promise; // Fetch first page?

        if (!oldPages.length) {
          promise = fetchPage([]);
        } // Fetch next page?
        else if (isFetchingNextPage) {
          const manual = typeof pageParam !== 'undefined';
          const param = manual ? pageParam : getNextPageParam(context.options, oldPages);
          promise = fetchPage(oldPages, manual, param);
        } // Fetch previous page?
        else if (isFetchingPreviousPage) {
          const manual = typeof pageParam !== 'undefined';
          const param = manual ? pageParam : getPreviousPageParam(context.options, oldPages);
          promise = fetchPage(oldPages, manual, param, true);
        } // Refetch pages
        else {
          newPageParams = [];
          const manual = typeof context.options.getNextPageParam === 'undefined';
          const shouldFetchFirstPage = refetchPage && oldPages[0] ? refetchPage(oldPages[0], 0, oldPages) : true; // Fetch first page

          promise = shouldFetchFirstPage ? fetchPage([], manual, oldPageParams[0]) : Promise.resolve(buildNewPages([], oldPageParams[0], oldPages[0])); // Fetch remaining pages

          for (let i = 1; i < oldPages.length; i++) {
            promise = promise.then(pages => {
              const shouldFetchNextPage = refetchPage && oldPages[i] ? refetchPage(oldPages[i], i, oldPages) : true;

              if (shouldFetchNextPage) {
                const param = manual ? oldPageParams[i] : getNextPageParam(context.options, pages);
                return fetchPage(pages, manual, param);
              }

              return Promise.resolve(buildNewPages(pages, oldPageParams[i], oldPages[i]));
            });
          }
        }

        const finalPromise = promise.then(pages => ({
          pages,
          pageParams: newPageParams
        }));
        (_context$signal = context.signal) == null ? void 0 : _context$signal.addEventListener('abort', () => {
          cancelled = true;
          abortController == null ? void 0 : abortController.abort();
        });
        return finalPromise;
      };
    }
  };
}
export function getNextPageParam(options, pages) {
  return options.getNextPageParam == null ? void 0 : options.getNextPageParam(pages[pages.length - 1], pages);
}
export function getPreviousPageParam(options, pages) {
  return options.getPreviousPageParam == null ? void 0 : options.getPreviousPageParam(pages[0], pages);
}
/**
 * Checks if there is a next page.
 * Returns `undefined` if it cannot be determined.
 */

export function hasNextPage(options, pages) {
  if (options.getNextPageParam && Array.isArray(pages)) {
    const nextPageParam = getNextPageParam(options, pages);
    return typeof nextPageParam !== 'undefined' && nextPageParam !== null && nextPageParam !== false;
  }
}
/**
 * Checks if there is a previous page.
 * Returns `undefined` if it cannot be determined.
 */

export function hasPreviousPage(options, pages) {
  if (options.getPreviousPageParam && Array.isArray(pages)) {
    const previousPageParam = getPreviousPageParam(options, pages);
    return typeof previousPageParam !== 'undefined' && previousPageParam !== null && previousPageParam !== false;
  }
}