import { EventEmitter } from './utils/event-emitter';
import type { Debounce } from './types';
import type { Widget } from './widget';
/**
 * Container element
 */
export interface ContainerElement extends HTMLElement {
    rcWidget?: Widget;
}
/**
 * Options for waiting when the container enters the viewport
 */
export interface EnterViewportOptions {
    /** Enable lazy loading, default is false */
    lazy?: boolean;
    /** Offset for lazy loading, default is 300 */
    offset?: number;
}
/**
 * Container for widgets
 */
export declare class Container extends EventEmitter {
    private element;
    private reduceViewportChange?;
    private ready?;
    private viewportManager?;
    private destroyed;
    /**
     * Container constructor
     *
     * @param element Container's DOM element
     * @param reduceViewportChange Function to throttle viewport change events
     */
    constructor(element: ContainerElement, reduceViewportChange?: Debounce);
    getElement(): ContainerElement;
    /**
     * Append content element
     */
    appendChild(element: HTMLElement): void;
    /**
     * Manually destroy the container
     */
    destroy: () => void;
    updateViewport(): void;
    private subscribeScroll;
    private onScroll;
    /**
     * Returns a Promise that resolves when the container enters the viewport from the top
     */
    whenEnterViewportFromTop(options: EnterViewportOptions): Promise<void>;
}