/**
 * Easing functions for use with {@link Tween}.
 * Each family provides `In` (accelerate), `Out` (decelerate), and `InOut` (both) variants.
 *
 * Available families:
 * - `Linear.None` — constant speed
 * - `Quadratic` — power of 2
 * - `Cubic` — power of 3
 * - `Quartic` — power of 4
 * - `Quintic` — power of 5
 * - `Sinusoidal` — sine wave
 * - `Exponential` — base-2 exponential
 * - `Circular` — circular arc
 * - `Elastic` — spring overshoot
 * - `Back` — slight overshoot before settling
 * - `Bounce` — bouncing ball effect
 * @example
 * // use with Tween
 * new me.Tween(obj).to({ x: 100 }, {
 *     duration: 1000,
 *     easing: me.Tween.Easing.Bounce.Out,
 * }).start();
 * @see https://easings.net/ for visual reference
 * @category Tweens
 */
export type EasingFunction = (t: number) => number;
export declare const Easing: {
    Linear: {
        None: (k: number) => number;
    };
    Quadratic: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Cubic: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Quartic: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Quintic: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Sinusoidal: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Exponential: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Circular: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Elastic: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Back: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
    Bounce: {
        In: (k: number) => number;
        Out: (k: number) => number;
        InOut: (k: number) => number;
    };
};
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