export declare abstract class fs {
    static isTsNode: boolean;
    static exists(pathToDirOrFile: string): Promise<boolean>;
    static readDir(dir: string, recursive?: boolean): Promise<string[]>;
    static writeJson(filePath: string, json: Record<string, unknown>): Promise<boolean>;
    static readJson<T>(filePath: string): Promise<T>;
    static resolveZenPath(key: string): string;
    static resolveZenFileExtension(filename?: string): string;
    static sanitizeFilename(filename: string): string;
    static appDir(): string;
    static isDev(): boolean;
}