import { Session } from 'koishi';
export declare function handleImageUpload<T>(session: Session, content: string, handler: (imageData: Buffer[]) => Promise<T>): Promise<T>;
export declare function getImageType(buffer: Buffer, pure?: boolean): string;
export declare function generateId(): string;
export declare function formatFileSize(bytes: number): string;
export declare function chunkArray<T>(array: T[], size: number): T[][];