import { KeyValueCache } from 'fetchache';
import { fetch } from 'cross-fetch';
import isUrl from 'is-url';
export { isUrl };
interface ReadFileOrUrlOptions extends RequestInit {
    allowUnknownExtensions?: boolean;
    fallbackFormat?: 'json' | 'yaml';
    cwd?: string;
    fetch?: typeof fetch;
}
export declare function getCachedFetch(cache: KeyValueCache): typeof fetch;
export declare function readFileOrUrlWithCache<T>(filePathOrUrl: string, cache: KeyValueCache, config?: ReadFileOrUrlOptions): Promise<T>;
export declare function readFileWithCache<T>(filePath: string, cache: KeyValueCache, config?: ReadFileOrUrlOptions): Promise<T>;
export declare function readUrlWithCache<T>(path: string, cache: KeyValueCache, config?: ReadFileOrUrlOptions): Promise<T>;