import type { TftRawData } from './types.js';
/**
 * Fetch TFT data from CommunityDragon with file-based caching.
 *
 * - Uses cached data if less than 6 hours old
 * - Uses If-Modified-Since for conditional requests
 * - Falls back to cached data on network failure
 * - Throws if no cache exists and fetch fails
 *
 * @param cacheDir - Directory for cached files. Defaults to ~/.tft-oracle/.
 * @param fetchFn - Optional fetch implementation (for testing/DI).
 */
export declare function fetchTftData(cacheDir?: string, fetchFn?: typeof fetch): Promise<TftRawData>;
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