/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
/**
 * Utility class for generating user agent strings for Copilot Studio client requests.
 */
export declare class UserAgentHelper {
    /**
     * Generates a user agent string appropriate for the current environment.
     * - For browser environments, includes the browser's user agent.
     * - For Node.js environments, includes Node version, platform, architecture, and release.
     * @returns A user agent string for HTTP headers.
     */
    static getProductInfo(): string;
    /**
     * Gets just the version string without environment details.
     * @returns The version string (e.g., "CopilotStudioClient.agents-sdk-js/0.1.0")
     */
    static getVersionString(): string;
    /**
     * Gets the SDK version number.
     * @returns The version number (e.g., "0.1.0")
     */
    static getVersion(): string;
}