/**
 * Minimal magic bytes detection for common media types.
 * This can be replaced with `file-type` package (https://npm.im/file-type)
 * if more comprehensive detection is needed. The API is designed to be
 * compatible: fileTypeFromBuffer(data) returns { mime: string, ext: string } | undefined
 */
export interface FileTypeResult {
    mime: string;
    ext: string;
}
export declare function fileTypeFromBuffer(data: Uint8Array): FileTypeResult | undefined;