import { NgxAnalytics } from 'ngx-analytics';
export declare class NgxAnalyticsFacebook {
    private ngxAnalytics;
    constructor(ngxAnalytics: NgxAnalytics);
    /**
     * Send interactions to the Pixel, i.e. for event tracking in Pixel
     *
     * @param action action associated with the event
     */
    eventTrack(action: string, properties?: any): void;
}