import { NgZone } from '@angular/core';
import { Instance, Options } from '@popperjs/core';
import { Observable } from 'rxjs';
export declare type PopperInstance = Instance;
export declare type PopperOptions = Options;
export declare class Popper {
    private zone;
    constructor(zone: NgZone);
    create(reference: Element, content: HTMLElement, options: Partial<PopperOptions>): Observable<PopperInstance>;
}