/** Linear interpolation */
export declare const lerp: (a: number, b: number, t: number) => number;
/** Hermite interpolation (3rd order) */
export declare const smoothstep: (t: number) => number;
/** Hermite interpolation (5th order) */
export declare const smootherstep: (t: number) => number;
/** Easing function type */
export type EasingFunction = (t: number) => number;
/** Convert an ease-in (accelerate) function to an ease-out
 * (decelerate) function. */
export declare const easeOut: (fn: EasingFunction) => EasingFunction;
/** Convert an ease-in (accelerate) function to an ease-in-out
 * (accelerate then decelerate) function. */
export declare const easeInOut: (fn: EasingFunction) => EasingFunction;
/** Quadratic ease-in function, position equals `t ** 2` */
export declare const easeInQuad: (t: number) => number;
/** Quadratic ease-out function */
export declare const easeOutQuad: (t: number) => number;
/** Quadratic ease-in-out function */
export declare const easeInOutQuad: (t: number) => number;
/** Cubic ease-in function, position equals `t ** 3` */
export declare const easeInCubic: (t: number) => number;
/** Cubic ease-out function */
export declare const easeOutCubic: (t: number) => number;
/** Cubic ease-in-out function */
export declare const easeInOutCubic: (t: number) => number;
/** Sinusoidal ease-in function */
export declare const easeInSine: (t: number) => number;
/** Sinusoidal ease-out function */
export declare const easeOutSine: (t: number) => number;
/** Sinusoidal ease-in-out function */
export declare const easeInOutSine: (t: number) => number;