export function isPx(v: any): boolean;
export function isRem(v: any): boolean;
export function isEm(v: any): boolean;
export function isUnitlessNumber(v: any): boolean;
export function isNonNegativeUnitlessNumber(v: any): boolean;
export function isPercent(v: any): boolean;
export function isHex(v: any): boolean;
export function isRgb(v: any): boolean;
export function isRgba(v: any): boolean;
export function isHsl(v: any): boolean;
export function isHsla(v: any): boolean;
export function isNamedColor(v: any): boolean;
export function isMobileColor(v: any): boolean;
export function isWebColor(v: any): boolean;
