Configuration

import { setDefaultConfig, registerFetcher, setQueryData, getQueryData, invalidateQuery, dangerClearCache } from "qortex-core";

// Set global defaults
setDefaultConfig({
  staleTime: 5 * 60 * 1000, // 5 minutes
  refetchOnSubscribe: "stale",
  throttleTime: 100,
  usePreviousDataOnError: false,
  usePlaceholderOnError: false,
  equalityFn: shallowEqual
});

// Register fetcher with custom options
registerFetcher(["live-data"], {
  fetcher: async () => {
    const response = await fetch("/api/live-data");
    return response.json();
  },
  staleTime: 0, // Always stale for live data
  placeholderData: { value: 0, timestamp: Date.now() }
});

// Use with additional options
const { data } = useQuery(["live-data"], {
  refetchOnSubscribe: "always", // Override global default
  enabled: isOnline // Conditional fetching
});

// Manual data updates
setQueryData(["todos"], newTodos);

// Get current data
const currentTodos = getQueryData(["todos"]);

// Clear all cached data (testing only)
dangerClearCache();

// Global error handling
setDefaultConfig({
  usePreviousDataOnError: true, // Keep previous data
  usePlaceholderOnError: false  // Don't use placeholder on error
});

// Per-query error handling
registerFetcher(["critical-data"], {
  fetcher: async () => {
    const response = await fetch("/api/critical-data");
    if (!response.ok) throw new Error('Failed to fetch critical data');
    return response.json();
  },
  placeholderData: { status: 'loading' },
  usePlaceholderOnError: true // Use placeholder on error
});

// In component
const { data, error, refetch } = useQuery(["critical-data"], {
  usePreviousDataOnError: false // Override for this query
});