import { EventEmitter } from '../event';
import { IIntersectionObserverExtOption, IIntersectionChangeData } from './types';
/**
 * IntersectionEvent Types
 * @event IntersectionObserver#INTERSECTION_EVENTS
 * @memberof IntersectionObserver
 * @property {String} CHANGE - 변경 시점
 */
/**
 * @export
 * @readonly
 * @enum {INTERSECTION_EVENTS}
 */
export declare const INTERSECTION_EVENTS: {
    CHANGE: string;
};
/**
 * @typedef {String} INTERSECTION_DIRECTIONS
 * @alias INTERSECTION_DIRECTIONS
 * @memberof IntersectionObserver
 * @property {String} UP
 * @property {String} DOWN
 * @property {String} UNKNOWN
 */
/**
 * @export
 * @readonly
 * @enum {INTERSECTION_DIRECTIONS}
 */
export declare enum INTERSECTION_DIRECTIONS {
    UP = "INTERSECTION_OBSERVER-DIRECTIONS-UP",
    DOWN = "INTERSECTION_OBSERVER-DIRECTIONS-DOWN",
    UNKNOWN = "INTERSECTION_OBSERVER-DIRECTIONS-UNKNOWN"
}
export declare class ExtIntersectionObserverEntry {
    private options;
    private target;
    private visibleRatio;
    constructor(initParams: Partial<IIntersectionObserverExtOption>);
    private checkForIntersections;
    private computeTargetAndRootIntersection;
    private computeRectIntersection;
    private parseRootMargin;
    private rootIsInDom;
    private rootContainsTarget;
    private containsDeep;
    private getParentNode;
    private getRootRect;
    private getBoundingClientRect;
    private getEmptyRect;
    private expandRectByRootMargin;
    getChangeData(): IIntersectionChangeData;
}
/**
 * element 가 viewport 영역에 노출되는지 변화를 감지
 * @export
 * @class IntersectionObserver
 * @alias observer/IntersectionObserver
 * @extends {EventEmitter}
 * @see https://developer.mozilla.org/ko/docs/Web/API/IntersectionObserver/IntersectionObserver
 * @see https://caniuse.com/#search=IntersectionObserver
 * @throws {Error} target 옵션을 지정하지 않은 경우 - throw new Error('IntersectionObserver target 설정은 필수 값 입니다.');
 * @param {Partial<IIntersectionObserverExtOption>} initParams
 * @param {Element} initParams.target
 * @param {Number} [initParams.visibleRatio=0]
 * @param {Number} [initParams.throttle=300]
 * @param {Function|null} [initParams.callback={@link noop}] callback function
 * @param {IntersectionObserverInit} [initParams.options={}]
 * @example
 .. TODO
 */
export declare class IntersectionObserver extends EventEmitter {
    private observer;
    private options;
    private target;
    private visibleRatio;
    private prevRatio;
    constructor(initParams: Partial<IIntersectionObserverExtOption>);
    /**
     * element 가 이미 노출된 경우 등, IntersectionObserver 등록으로 판단이 어려울 경우<br>
     * IntersectionObserver.getIntersectionEntry 를 이용하여 target 의 노출 여부를 판단
     * @static
     * @param {Partial<IIntersectionObserverExtOption>} initParams
     * @param {Element} initParams.target
     * @param {Number} [initParams.visibleRatio=0]
     * @param {Number} [initParams.throttle=300]
     * @param {Function|null} [initParams.callback={@link noop}] callback function
     * @param {IntersectionObserverInit} [initParams.options={}]
     * @returns {IIntersectionChangeData}
     * @memberof IntersectionObserver
     * @example
     .. TODO
     */
    static getIntersectionEntry(initParams: Partial<IIntersectionObserverExtOption>): IIntersectionChangeData;
    private onIntersectionCallback;
    /**
     * 변화 감지 이벤트 리스너
     * @private
     * @param {IntersectionObserverEntry[]} entries
     * [MDN IntersectionObserverEntry]{@link https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserverEntry}
     * @memberof IntersectionObserver
     * @fires IntersectionObserver#INTERSECTION_EVENTS
     */
    private onIntersectionListener;
    /**
     * 이벤트 감지 설정
     * @returns {IntersectionObserver}
     * @memberof IntersectionObserver
     */
    attach(): IntersectionObserver;
    /**
     * 이벤트 감지 해제
     * @returns {IntersectionObserver}
     * @memberof IntersectionObserver
     */
    detach(): IntersectionObserver;
    /**
     * destroy
     * @returns {IntersectionObserver}
     * @memberof IntersectionObserver
     */
    destroy(): IntersectionObserver;
}