/**
 * Simple numeric interpolator function
 */
export function number(fromValue: any, toValue: any, progress: any): any;
/**
 * Interpolator for color values; decomposes the color into r/g/b channels and does
 * numeric interpolation on each individually. The result is a 24-bit integer value
 * holding the r/g/b channels in its 3 bytes.
 */
export function color(fromValue: any, toValue: any, progress: any): number;