export declare function getFileExtension(fileName: string): string;
export declare function getMimeType(fileName: string): string;
export declare function getLanguage(fileName: string): string;
export declare function isAllowedExtension(fileName: string): boolean;
export declare function isDangerousExtension(fileName: string): boolean;
export declare function validateFileName(fileName: string): string;
export declare function validateFileKey(key: string): string;
export declare function validateFileSize(size: number, maxSize: number): void;
export declare function getContentSize(content: Buffer | Uint8Array | string): number;
export declare function encodeToBase64(content: Buffer | Uint8Array | string): string;
export declare function formatFileSize(bytes: number): string;
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