import { ContentBlock, ImageMetadataBlock } from "./types";
/**
 * Detect MIME type from image binary data using magic bytes (file signatures)
 * Returns null if the format is not recognized
 */
export declare function detectMimeTypeFromBuffer(buffer: ArrayBuffer): string | null;
/**
 * Downloads images from image_metadata blocks and applies smart size/count limiting
 * Prioritizes keeping the most recent images (assumes content is ordered with newest items last)
 * Uses intelligent size calculation accounting for text content
 *
 * @param content Array of content blocks that may contain image_metadata blocks
 * @param maxImages Maximum number of images to keep (defaults to CONFIG.maxImages)
 * @param maxSizeMB Maximum response size in MB (defaults to CONFIG.maxResponseSizeMB)
 * @returns Promise resolving to content array with downloaded images or placeholders
 */
export declare function downloadImages(content: (ContentBlock | ImageMetadataBlock)[], maxImages?: number, maxSizeMB?: number): Promise<ContentBlock[]>;
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