react-query/es/core/infiniteQueryBehavior.js

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

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

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

        var queryFn = context.options.queryFn || function () {
          return Promise.reject('Missing queryFn');
        };

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


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

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

          var queryFnContext = {
            queryKey: context.queryKey,
            pageParam: param
          };
          var queryFnResult = queryFn(queryFnContext);
          var promise = Promise.resolve(queryFnResult).then(function (page) {
            return buildNewPages(pages, param, page, previous);
          });

          if (isCancelable(queryFnResult)) {
            var promiseAsAny = promise;
            promiseAsAny.cancel = queryFnResult.cancel;
          }

          return promise;
        };

        var promise; // Fetch first page?

        if (!oldPages.length) {
          promise = fetchPage([]);
        } // Fetch next page?
        else if (isFetchingNextPage) {
            var manual = typeof pageParam !== 'undefined';
            var param = manual ? pageParam : getNextPageParam(context.options, oldPages);
            promise = fetchPage(oldPages, manual, param);
          } // Fetch previous page?
          else if (isFetchingPreviousPage) {
              var _manual = typeof pageParam !== 'undefined';

              var _param = _manual ? pageParam : getPreviousPageParam(context.options, oldPages);

              promise = fetchPage(oldPages, _manual, _param, true);
            } // Refetch pages
            else {
                (function () {
                  newPageParams = [];
                  var manual = typeof context.options.getNextPageParam === 'undefined';
                  var 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

                  var _loop = function _loop(i) {
                    promise = promise.then(function (pages) {
                      var shouldFetchNextPage = refetchPage && oldPages[i] ? refetchPage(oldPages[i], i, oldPages) : true;

                      if (shouldFetchNextPage) {
                        var _param2 = manual ? oldPageParams[i] : getNextPageParam(context.options, pages);

                        return fetchPage(pages, manual, _param2);
                      }

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

                  for (var i = 1; i < oldPages.length; i++) {
                    _loop(i);
                  }
                })();
              }

        var finalPromise = promise.then(function (pages) {
          return {
            pages: pages,
            pageParams: newPageParams
          };
        });
        var finalPromiseAsAny = finalPromise;

        finalPromiseAsAny.cancel = function () {
          cancelled = true;

          if (isCancelable(promise)) {
            promise.cancel();
          }
        };

        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)) {
    var 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)) {
    var previousPageParam = getPreviousPageParam(options, pages);
    return typeof previousPageParam !== 'undefined' && previousPageParam !== null && previousPageParam !== false;
  }
}