/**
 * Linear interpolation.
 * @param a start point
 * @param b stop point
 * @param t blend factor in the interval [0, 1]
 */
export declare function lerp(a: number, b: number, t: number): number;
export declare function clamp(a: number, b: number, c: number): number;
/**
 * Quadratic Bezier Curve
 */
export declare function bezier2(p0: number, p1: number, p2: number, t: number): number;
/**
 * Cubic Bezier Curve
 */
export declare function bezier3(p0: number, p1: number, p2: number, p3: number, t: number): number;