import { LengthObject } from "../interfaces";
/**
 * If size is a number, append px to the value as default unit.
 * If size is a string, validate against list of valid units.
 * If unit is valid, return size as is.
 * If unit is invalid, console warn issue, replace with px as the unit.
 *
 * @param {(number | string)} size
 * @return {LengthObject} LengthObject
 */
export declare function parseLengthAndUnit(size: number | string): LengthObject;
/**
 * Take value as an input and return valid css value
 *
 * @param {(number | string)} value
 * @return {string} valid css value
 */
export declare function cssValue(value: number | string): string;