/**
 * Image downloader for Azure DevOps.
 *
 * Downloads images from ADO URLs (attachments, inline images in HTML fields)
 * and converts them to base64 for MCP image content blocks.
 *
 * Handles ADO authentication by injecting the PAT as a Basic auth header.
 */
/**
 * Download an image from a URL and return as base64.
 * Supports ADO authenticated URLs.
 */
export declare function downloadImageAsBase64(url: string, pat: string): Promise<{
    base64: string;
    mimeType: string;
} | null>;
/**
 * Extract image URLs from ADO HTML content.
 *
 * ADO inline images come in several formats:
 *   - <img src="https://dev.azure.com/.../attachments/...">
 *   - <img src="https://{org}.visualstudio.com/.../attachments/...">
 *   - data:image URIs (already base64, rare)
 */
export declare function extractImageUrls(html: string | undefined | null): string[];
/**
 * Extract attachment URLs from work item relations.
 * Returns only AttachedFile relations that look like images.
 */
export declare function extractAttachmentInfo(relations: Array<{
    rel?: string;
    url?: string;
    attributes?: Record<string, any>;
}>): Array<{
    name: string;
    url: string;
    isImage: boolean;
}>;
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