export declare function isValidFontSize(fontSize: string): boolean;
export declare function isValidFontWeight(fontWeight: string): boolean;
export declare function isValidCssColor(color: string): boolean;
export declare function isValidBorder(border: string): boolean;
export declare function isValidPadding(padding: string): boolean;
export declare function appendPxIfNumber(value: string | number | undefined): string | undefined;
