import { NominalRatio, NominalRatioTransform, UnitDefinition, UnitDefinitions, UnitConvertOptions } from '../types/convert';
export declare abstract class UnitSystem<T = unknown> {
    name: string;
    nominalRatio: NominalRatioTransform;
    private _baseUnit;
    private _units;
    constructor({ baseUnit, name, nominalRatio, }: {
        baseUnit: T;
        name: string;
        nominalRatio: NominalRatio;
    }, definitions: UnitDefinition<T>[]);
    readonly baseUnit: UnitDefinition<T>;
    readonly units: UnitDefinitions<T>;
    findUnit(unit: T): UnitDefinition<T>;
    convert(value: number | string, { from, to }: UnitConvertOptions<T>): number | string;
    fromNominal(value: number | string, { to }: Partial<UnitConvertOptions<T>>): number | string;
    toNominal(value: number | string, { from }: Partial<UnitConvertOptions<T>>): number | string;
    private nominalRatioHelper;
}