import type { EasingType } from '@visactor/vrender-core';
import { CommonIn, CommonOut } from './common';
export interface IScaleAnimationOptions {
    direction?: 'x' | 'y' | 'xy';
}
export declare class FadeIn extends CommonIn {
    valid: boolean;
    constructor(from: null, to: null, duration: number, easing: EasingType, params?: IScaleAnimationOptions);
}
export declare class FadeOut extends CommonOut {
    valid: boolean;
    constructor(from: null, to: null, duration: number, easing: EasingType, params?: IScaleAnimationOptions);
}