/** Cubic ease-in-out: Bevy `EaseFunction::CubicInOut`, clamped to [0, 1]. */
export declare function cubicInOut(t: number): number;
/**
 * Smoothstep S-curve: `3t² − 2t³` on the clamped input. GLSL `smoothstep` (with edges 0/1),
 * Bevy `EaseFunction::SmoothStep`. f(0)=0, f(1)=1, f′(0)=f′(1)=0 (slow-in / slow-out).
 * Input clamped to [0, 1]. Use to ease a normalized time / lerp factor instead of a linear ramp.
 */
export declare function smoothstep(t: number): number;
/**
 * Smootherstep (Perlin) S-curve: `6t⁵ − 15t⁴ + 10t³` on the clamped input. Bevy
 * `EaseFunction::SmootherStep`. Like {@link smoothstep} but ALSO has zero 2nd derivatives at
 * the endpoints (f″(0)=f″(1)=0), so acceleration is continuous — a gentler, more natural ease.
 * Input clamped to [0, 1].
 */
export declare function smootherstep(t: number): number;
/** Elastic ease-in-out: Bevy `EaseFunction::ElasticInOut`, clamped to [0, 1]. */
export declare function elasticInOut(t: number): number;
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