/**
 * Class responsible for tracking which Virgil SDK is being used to make requests, its version,
 * browser and platform.
 */
export declare class VirgilAgent {
    value: string;
    private userAgent;
    /**
     * Returns navigator.userAgent string or '' if it's not defined.
     * @return {string} user agent string
     */
    private getUserAgent;
    /**
     * Initializes a new instance of `VirgilAgent`.
     * @param {string} product - name of product eg (sdk, brainkey, bpp, keyknox, ratchet, e3kit, purekit)
     * argument of request methods.
     * @param {string} version - version of the product.
     * @param {string} [userAgent] - string with device user agent. Optional
     */
    constructor(product: string, version: string, userAgent?: string);
    /**
     * Detects device OS
     * @returns {string} returns OS if detected or 'other'.
     */
    getOsName(): string;
    /**
     * Detects device browser
     * @returns {string} returns browser if detected of 'other'.
     */
    getBrowser(): string;
    /**
     * Detect React Native.
     * @return {boolean} true if detects ReactNative .
     */
    private isReactNative;
    /**
     * Detect Cordova / PhoneGap / Ionic frameworks on a mobile device.
     * @return {boolean} true if detects Ionic.
     */
    private isIonic;
    /**
     * Return information for `virgil-agent` header.
     * @return {string} string in format: PRODUCT;FAMILY;PLATFORM;VERSION
     */
    private getHeaderValue;
}