/**
 * Image Loader for Multi-Modal RAG
 *
 * Loads image files (from disk or URLs) into ImageDocument objects
 * that can be embedded and stored in a vector store alongside text chunks.
 *
 * @example
 * ```typescript
 * import { ImageLoader } from './imageLoader.js';
 *
 * const loader = new ImageLoader();
 *
 * // Load from file path
 * const doc = await loader.load('./photo.jpg');
 *
 * // Load from URL
 * const doc2 = await loader.load('https://example.com/image.png');
 *
 * // Load from buffer
 * const doc3 = loader.loadFromBuffer(imageBuffer, 'image/jpeg');
 * ```
 */
import type { ImageDocument, ImageLoaderOptions } from "../../types/index.js";
/**
 * ImageLoader for multi-modal RAG.
 * Loads images from file paths, URLs, or buffers into ImageDocument objects.
 */
export declare class ImageLoader {
    private options;
    constructor(options?: ImageLoaderOptions);
    /**
     * Load an image from a file path or URL.
     */
    load(source: string, options?: Partial<ImageLoaderOptions>): Promise<ImageDocument>;
    /**
     * Load an image from a local file path.
     */
    private loadFromPath;
    /**
     * Load an image from a URL.
     */
    private loadFromURL;
    /**
     * Load an image directly from a Buffer.
     */
    loadFromBuffer(buffer: Buffer, mimeType: string, source?: string, options?: Partial<ImageLoaderOptions>): ImageDocument;
    /**
     * Check if a file path or extension is a supported image format.
     */
    static isImageFile(source: string): boolean;
    /**
     * Get the MIME type for a file extension.
     */
    static getMimeType(filePath: string): string | undefined;
}