import multer from 'multer';
/**
 * Shared multer instance used by all upload endpoints.
 * Files are kept in memory so services receive a Buffer — no temp-file cleanup needed.
 */
export declare const imageUpload: multer.Multer;
type DetectedFile = {
    mime: string;
    ext: string;
};
export declare function detectImageType(buffer: Buffer): DetectedFile | null;
/**
 * Asserts that a file was provided and is an image by content, not by client claims.
 */
export declare function assertImageFile(file: Express.Multer.File | undefined, fieldLabel?: string): asserts file is Express.Multer.File;
/**
 * Asserts that at least one file was provided and all files are image content.
 */
export declare function assertImageFiles(files: Express.Multer.File[], fieldLabel?: string): void;
export {};
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