/**
 * @param file
 * @param fs - User provided file system, defaults to fs-extra.
 * @returns True if the file exists.
 */
export declare function existsSync(file: string, fs?: any): boolean;
/**
 * @param file
 * @param fs - User provided file system, defaults to fs-extra.
 * @returns True if the file exists.
 */
export declare function exists(file: string, fs?: any): Promise<boolean>;