/**
 * 缓动函数
 * t: current time（当前时间）
 * b: beginning value（初始值）
 * c: change in value（变化量）
 * d: duration（持续时间）
 *
 * 感谢张鑫旭大佬 https://github.com/zhangxinxu/Tween
 */
interface SpeedType {
    easeIn: (...arr: number[]) => number;
    easeOut: (...arr: number[]) => number;
}
export declare const quad: SpeedType;
export declare const cubic: SpeedType;
export declare const quart: SpeedType;
export declare const quint: SpeedType;
export declare const sine: SpeedType;
export declare const expo: SpeedType;
export declare const circ: SpeedType;
export {};