/**
 * Cubic Bezier Interpolation for MMD animation curves
 * @param x1 X1
 * @param x2 X2
 * @param y1 Y1
 * @param y2 Y2
 * @param x Weight
 * @returns Interpolated value
 */
export declare function BezierInterpolate(x1: number, x2: number, y1: number, y2: number, x: number): number;