/**
 * Creates cubic-bezier easing functions for animation engines.
 *
 * @see http://svn.webkit.org/repository/webkit/trunk/Source/WebCore/platform/graphics/UnitBezier.h
 *
 * @class
 */
declare class CubicBezier {
    cx: number;
    bx: number;
    ax: number;
    cy: number;
    by: number;
    ay: number;
    /**
     * @constructor
     * @param x1 - first point horizontal position
     * @param y1 - first point vertical position
     * @param x2 - second point horizontal position
     * @param y2 - second point vertical position
     * @param functionName - an optional function name
     * @returns a new CubicBezier easing function
     */
    constructor(x1?: number, y1?: number, x2?: number, y2?: number, functionName?: string);
    /**
     * @param t - progress [0-1]
     * @return - sampled X value
     */
    sampleCurveX(t: number): number;
    /**
     * @param t - progress [0-1]
     * @return - sampled Y value
     */
    sampleCurveY(t: number): number;
    /**
     * @param t - progress [0-1]
     * @return - sampled curve derivative X value
     */
    sampleCurveDerivativeX(t: number): number;
    /**
     * @param x - progress [0-1]
     * @return - solved curve X value
     */
    solveCurveX(x: number): number;
}
export default CubicBezier;

export { }