/**
 * @typedef {Object} Unit
 * @property {Array<string>} names
 * @property {number} ratio
 */
/**
 * @typedef {Object<Unit>} UnitMap
 */
/**
 * Convert a value from one unit to another
 *
 * @param   {UnitMap} unitSet Units set to work with
 * @param   {string|number} value
 * @param   {string} from_ Source unit name
 * @param   {string} to_ Target unit name
 *
 * @returns {number}
 * @private
 */
export default function convert(unitSet: UnitMap, value: string | number, from_: string, to_?: string): number;
export type Unit = {
    names: Array<string>;
    ratio: number;
};
export type UnitMap = any;