/**
 * Image utility functions for downloading and converting images
 */
/**
 * Download an image from URL and convert to base64
 */
export declare function downloadImageAsBase64(imageUrl: string): Promise<{
    data: string;
    mimeType: string;
} | null>;
/**
 * Get MIME type from image URL extension (fallback)
 */
export declare function getMimeTypeFromUrl(url: string): string;
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