/**
 * Image MIME type detection by reading file magic bytes.
 *
 * Only recognizes image formats supported by the LLM vision APIs
 * (JPEG, PNG, GIF, WebP). Returns null for unsupported or non-image files.
 */
/** Detect if a file is a supported image by sniffing its first bytes. Returns the MIME type or null. */
export declare function detectSupportedImageMimeTypeFromFile(filePath: string): Promise<string | null>;
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