export declare abstract class AnimationClip<Value = unknown> {
    abstract get duration(): number;
    /**
     * 每次状态更新时的回调
     */
    protected _onUpdate: (value: Value) => void;
    /**
     * 计算状态用到的方程
     */
    protected abstract _equation: (...args: unknown[]) => Value;
    /**
     * 状态更新
     * @param context
     */
    abstract update(frameTime: number): void;
}