/**
 * MCP Registry Client
 *
 * Client for discovering MCP servers from centralized registries.
 * Supports multiple registry sources including:
 * - Official MCP Registry
 * - NPM packages
 * - GitHub repositories
 * - Custom registries
 *
 * @module mcp/mcpRegistryClient
 * @since 8.39.0
 */
import { EventEmitter } from "events";
import type { MCPServerInfo, MCPRegistryClientConfig, RegistryConfig, RegistrySearchOptions, RegistrySearchResult, McpRegistryEntry } from "../types/index.js";
/**
 * MCP Registry Client
 *
 * Provides methods to discover and install MCP servers from registries.
 *
 * @example
 * ```typescript
 * const client = new MCPRegistryClient();
 *
 * // Search for servers
 * const results = await client.search({ query: "database" });
 *
 * // Get server details
 * const entry = await client.getEntry("postgres");
 *
 * // Convert to MCPServerInfo
 * const serverInfo = client.toServerInfo(entry);
 * ```
 */
export declare class MCPRegistryClient extends EventEmitter {
    private config;
    private cache;
    private customEntries;
    constructor(config?: MCPRegistryClientConfig);
    /**
     * Search the registry
     */
    search(options?: RegistrySearchOptions): Promise<RegistrySearchResult>;
    /**
     * Get a specific entry by ID
     */
    getEntry(id: string): Promise<McpRegistryEntry | undefined>;
    /**
     * Get all available entries
     */
    getAllEntries(): Promise<McpRegistryEntry[]>;
    /**
     * Get entries by category
     */
    getByCategory(category: string): Promise<McpRegistryEntry[]>;
    /**
     * Get entries by tag
     */
    getByTag(tag: string): Promise<McpRegistryEntry[]>;
    /**
     * Get all categories
     */
    getCategories(): Promise<string[]>;
    /**
     * Get all tags
     */
    getTags(): Promise<string[]>;
    /**
     * Convert registry entry to MCPServerInfo
     */
    toServerInfo(entry: McpRegistryEntry): MCPServerInfo;
    /**
     * Add a custom registry entry
     */
    addCustomEntry(entry: McpRegistryEntry): void;
    /**
     * Remove a custom registry entry
     */
    removeCustomEntry(id: string): boolean;
    /**
     * Add a registry configuration
     */
    addRegistry(config: RegistryConfig): void;
    /**
     * Clear the cache
     */
    clearCache(): void;
    /**
     * Check if required environment variables are set
     */
    checkRequiredEnvVars(entry: McpRegistryEntry): {
        ready: boolean;
        missing: string[];
    };
    /**
     * Get installation command for an entry
     */
    getInstallCommand(entry: McpRegistryEntry): string | undefined;
    /**
     * Get popular servers
     */
    getPopularServers(limit?: number): Promise<McpRegistryEntry[]>;
    /**
     * Get verified servers
     */
    getVerifiedServers(): Promise<McpRegistryEntry[]>;
    /**
     * Get statistics
     */
    getStatistics(): Promise<{
        totalEntries: number;
        verifiedEntries: number;
        categories: number;
        tags: number;
        customEntries: number;
    }>;
}
/**
 * Global MCP registry client instance
 */
export declare const globalMCPRegistryClient: MCPRegistryClient;
/**
 * Quick lookup function for well-known servers
 */
export declare function getWellKnownServer(id: string): McpRegistryEntry | undefined;
/**
 * Get all well-known servers
 */
export declare function getAllWellKnownServers(): McpRegistryEntry[];