/**
 * @file LayoutShift
 * @author kaivean
 */
import { Module, LayoutShiftCB } from '../lib/interface';
export default class LayoutShift implements Module {
    private observer;
    private cb;
    private value;
    private finalValue;
    private onceLeave;
    constructor();
    listenLayoutShift(cb: LayoutShiftCB): void;
    leave(): void;
    callCB(): void;
    destroy(): void;
    private handle;
}