export declare type Options = {
    controlGroup?: 'A' | 'B';
    cookieDomain?: string;
    enableLocalhost?: boolean;
    trackClientUrlChanges?: boolean;
    trackClientHashChanges?: boolean;
};
export default class Funnelbranch {
    private readonly delegate;
    static scriptVersion(): Promise<string>;
    static initialize(projectId: string, options?: Options): Promise<Funnelbranch>;
    private static loadScript;
    private constructor();
    submitAction(action?: string): void;
    destroy(): void;
}