export interface ResolvedImage {
    base64: string;
    filename: string;
}
/**
 * Resolves an image from various sources to a base64 string.
 * Supports: direct base64, local file path, HTTP(S) URL.
 */
export declare class ImageResolver {
    /**
     * Determines the source type from a string value.
     */
    static detectSourceType(value: string): "base64" | "url" | "path";
    /**
     * Reads a local file and returns its base64-encoded content.
     */
    static fromPath(filePath: string): Promise<ResolvedImage>;
    /**
     * Fetches an image from a URL and returns its base64-encoded content.
     */
    static fromUrl(url: string): Promise<ResolvedImage>;
    /**
     * Resolves an image from any supported source string.
     */
    static resolve(source: string, fallbackFilename?: string): Promise<ResolvedImage>;
}