import { ProtectedResourceMetadata } from '../types/protected-resource-metadata.js';
/**
 * OAuth 2.0 Protected Resource Metadata Discovery Client
 * Implements RFC 9728 for MCP servers
 */
export declare class ProtectedResourceDiscoveryClient {
    private serverUrl;
    constructor(serverUrl: string);
    /**
     * Discover protected resource metadata from MCP server
     * Implements RFC 9728 Section 3
     */
    discover(): Promise<ProtectedResourceMetadata>;
    /**
     * Discover metadata via WWW-Authenticate header
     */
    private discoverViaWWWAuthenticate;
    /**
     * Fetch and validate metadata from a URL
     */
    private fetchMetadata;
    /**
     * Get the first authorization server from metadata
     */
    getAuthorizationServer(): Promise<string>;
    /**
     * Get all authorization servers from metadata
     */
    getAuthorizationServers(): Promise<string[]>;
}
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