/**
 * Image viewer service for handling system image display and caching.
 */
import { Cache, type CacheStats } from "./cache.js";
export declare enum ErrorCode {
    InvalidRequest = "INVALID_REQUEST",
    InternalError = "INTERNAL_ERROR",
    UnsupportedFormat = "UNSUPPORTED_FORMAT"
}
export declare class McpError extends Error {
    code: ErrorCode;
    constructor(code: ErrorCode, message: string);
}
export declare const IMAGE_MIME_TYPES: {
    readonly "image/jpeg": readonly [".jpg", ".jpeg"];
    readonly "image/png": readonly [".png"];
    readonly "image/gif": readonly [".gif"];
    readonly "image/webp": readonly [".webp"];
};
export type ImageFormat = keyof typeof IMAGE_MIME_TYPES;
interface ImageMetadata {
    format: ImageFormat;
    url: string;
    localPath?: string;
    width?: number;
    height?: number;
}
export declare const imageCache: Cache<ImageMetadata>;
export declare class ImageViewer {
    private static instance;
    private constructor();
    /**
     * Get singleton instance of ImageViewer
     */
    static getInstance(): ImageViewer;
    /**
     * Display an image in the system's default web browser
     */
    displayImage(url: string): Promise<void>;
    /**
     * Fetch metadata for an image URL
     */
    private fetchImageMetadata;
    /**
     * Open an image URL in the system's default web browser
     */
    private openInBrowser;
    /**
     * Clear the image cache
     */
    clearCache(): void;
    /**
     * Get statistics about the image cache
     */
    getCacheStats(): CacheStats;
}
export {};