import { Observable } from 'rxjs';
export declare class ClickOutsideService {
    constructor();
    /**
     * listen to click event from target and return true if this click happend outside of the monitor element
     * @param targetElement - the element to attach the click event handler to default window.
     * @param elementToMonitor - the element we want monitor that the click was outside it default element.nativeElement.
     */
    onClickOutside(elements: {
        target?: any;
        monitor: any;
    }): Observable<boolean>;
    private getPath;
    private getAllParent;
}