import type { AuthStrategy } from '../../../mcp-server/transports/auth/strategies/authStrategy.js';
/**
 * Creates and returns an authentication strategy instance based on the
 * application's configuration (`config.mcpAuthMode`).
 *
 * @returns An instance of a class that implements the `AuthStrategy` interface,
 *          or `null` if authentication is disabled (`none`).
 * @throws {Error} If the auth mode is unknown or misconfigured.
 */
export declare function createAuthStrategy(): AuthStrategy | null;
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