export declare const blur: (u: number, range?: number) => string;
export declare const brightness: (u: number) => string;
export declare const contrast: (u: number) => string;
export declare const dropShadow: (u: number, v: number, color: string, range: number) => string;
export declare const grayscale: (u: number) => string;
export declare const hueRotate: (u: number) => string;
export declare const invert: (u: number) => string;
export declare const opacity: (u: number) => string;
export declare const saturate: (u: number) => string;
export declare const sepia: (u: number) => string;