export declare class ImageValidator {
    private static readonly SUPPORTED_MIME_TYPES;
    private static readonly SUPPORTED_EXTENSIONS;
    static validateMimeType(mimeType: string): void;
    static validateExtension(filename: string): void;
    static validateFileSize(buffer: Buffer, maxSizeInBytes?: number): void;
    static validateFile(buffer: Buffer, filename: string, mimeType?: string, maxSizeInBytes?: number): void;
    private static getFileExtension;
}