export type Easing = (t: number) => number;
/** Linearly interpolate from `from` to `to` by fraction `t` (unclamped).
 * @internal
 */
export declare function lerp(from: number, to: number, t: number): number;
/** Constrain `t` to the unit range `[0, 1]`.
 * @internal
 */
export declare function clamp01(t: number): number;
/** Smooth Hermite interpolation of `t` across `[0, 1]`, easing both ends.
 * @internal
 */
export declare function smoothstep(t: number): number;
/** @internal */
export declare function easeInQuad(t: number): number;
/** @internal */
export declare function easeOutQuad(t: number): number;
/** @internal */
export declare function easeInOutQuad(t: number): number;
/** @internal */
export declare function easeInCubic(t: number): number;
/** @internal */
export declare function easeOutCubic(t: number): number;
/** @internal */
export declare function easeInOutCubic(t: number): number;
/** @internal */
export declare function easeOutBack(t: number): number;
/** @internal */
export declare function easeOutElastic(t: number): number;
/** @internal */
export declare function tween(from: number, to: number, t: number, easing?: Easing): number;
/** @internal */
export declare function timedProgress(startedAt: number, now: number, durationMs: number): number;