export interface CachedFetchOptions {
    /** The cache file path for storing data. If not provided, no caching is performed. */
    cacheFile?: string;
    /** Fallback max-age in milliseconds when server sends no Cache-Control header. Defaults to 5 minutes. */
    defaultMaxAgeMs?: number;
}
/** Extracts max-age value in milliseconds from a Response's Cache-Control header. Returns undefined if not present. */
export declare function parseMaxAge(response: {
    headers: {
        get(name: string): string | null;
    };
}): number | undefined;
/**
 * Fetches data from a URL with file-based HTTP conditional caching.
 *
 * Data is stored as raw JSON in the cache file (same format as the server returns).
 * Caching metadata (ETag, expiry) is stored in a separate sidecar `.meta` file.
 * This keeps the data file human-readable and backward-compatible with older code.
 *
 * @param url - The URL to fetch from
 * @param options - Caching options
 * @param fetch - Fetch implementation (defaults to globalThis.fetch)
 * @param log - Logger instance
 * @returns The fetched and parsed JSON data, or undefined if fetch fails
 */
export declare function cachedFetch<T = any>(url: string, options: CachedFetchOptions, fetch?: typeof globalThis.fetch, log?: import("@aztec/aztec.js/log").Logger): Promise<T | undefined>;
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