export declare namespace Tween {
    function Linear(t: number, b?: number, c?: number, d?: number): number;
    namespace Quad {
        function easeIn(t: number, b?: number, c?: number, d?: number): number;
        function easeOut(t: number, b?: number, c?: number, d?: number): number;
        function easeInOut(t: number, b?: number, c?: number, d?: number): number;
    }
    namespace Cubic {
        function easeIn(t: number, b?: number, c?: number, d?: number): number;
        function easeOut(t: number, b?: number, c?: number, d?: number): number;
        function easeInOut(t: number, b?: number, c?: number, d?: number): number;
    }
    namespace Quart {
        function easeIn(t: number, b?: number, c?: number, d?: number): number;
        function easeOut(t: number, b?: number, c?: number, d?: number): number;
        function easeInOut(t: number, b?: number, c?: number, d?: number): number;
    }
    namespace Quint {
        function easeIn(t: number, b?: number, c?: number, d?: number): number;
        function easeOut(t: number, b?: number, c?: number, d?: number): number;
        function easeInOut(t: number, b?: number, c?: number, d?: number): number;
    }
    namespace Sine {
        function easeIn(t: number, b?: number, c?: number, d?: number): number;
        function easeOut(t: number, b?: number, c?: number, d?: number): number;
        function easeInOut(t: number, b?: number, c?: number, d?: number): number;
    }
    namespace Expo {
        function easeIn(t: number, b?: number, c?: number, d?: number): number;
        function easeOut(t: number, b?: number, c?: number, d?: number): number;
        function easeInOut(t: number, b?: number, c?: number, d?: number): number;
    }
    namespace Circ {
        function easeIn(t: number, b?: number, c?: number, d?: number): number;
        function easeOut(t: number, b?: number, c?: number, d?: number): number;
        function easeInOut(t: number, b?: number, c?: number, d?: number): number;
    }
    namespace Elastic {
    }
    namespace Back {
    }
    namespace Bounce {
        function easeIn(t: number, b?: number, c?: number, d?: number): number;
        function easeOut(t: number, b?: number, c?: number, d?: number): number;
        function easeInOut(t: number, b?: number, c?: number, d?: number): number;
    }
}