import type { BinaryLike } from 'node:crypto';
export declare function randomStringGenerator(length: number): string;
export declare function renameFileNameWithTimestamp(oldName: string): string;
export declare function renameFileNameWithRandomString(oldName: string, length?: number): string;
export declare function renameFileNameWithCustomString(oldName: string, customFormat: string, affixFileName?: string, fileBuffer?: BinaryLike): string;