import type { EasingType } from '@visactor/vrender-core';
import { CommonIn, CommonOut } from './common';
export declare class GroupFadeIn extends CommonIn {
    valid: boolean;
    constructor(from: null, to: null, duration: number, easing: EasingType, params?: any);
}
export declare class GroupFadeOut extends CommonOut {
    valid: boolean;
    constructor(from: null, to: null, duration: number, easing: EasingType, params?: any);
}