import { Decimal } from 'decimal.js';
import { SymbolTable } from '../evaluator/symboltable';
declare type callbackFuncFmt = () => Decimal | number;
/**
 * IUseUnit
 * Interface for UseUnit functions param
 */
interface IUseUnit {
    id: string;
    type: string;
    ratio: Decimal | number | string | callbackFuncFmt;
    bias?: Decimal | number | string | callbackFuncFmt;
    phrases: string[];
    singular?: string;
    plural?: string;
}
declare class UnitMeta {
    id: string;
    r: Decimal | callbackFuncFmt;
    b: Decimal | callbackFuncFmt;
    unitType: string;
    singular: string;
    plural: string;
    constructor(id: string, ratio: Decimal | callbackFuncFmt, unitType: string);
    get ratio(): Decimal;
    get bias(): Decimal;
    setBias(value: Decimal | callbackFuncFmt): void;
    setPlural(value: string): void;
    setSingular(value: string): void;
}
/**
 * Represents unit with info
 */
declare class Unit {
    phrases: string[];
    meta: UnitMeta;
    constructor(id: string, ratio: Decimal | number | string | callbackFuncFmt, unitType: string, phrases: string[]);
    setBias(value: Decimal | number | string | callbackFuncFmt): Unit;
    Plural(value: string): Unit;
    Singular(value: string): Unit;
}
declare namespace Unit {
    const LENGTH_ID = "LENGTH";
    const SPEED_ID = "SPEED";
    const TIME_ID = "TIME";
    const TEMPERATURE_ID = "TEMPERATURE";
    const MASS_ID = "MASS";
    const DIGITAL_ID = "DIGITAL STORAGE";
    /**
     * List of {Unit} sunits
     */
    class List {
        symbolTable: SymbolTable;
        units: Map<string, Unit>;
        constructor(symbolTable: SymbolTable);
        /**
         * Add a new unit
         * @param {Unit} unit
         * @throws {FcalError} Error if phrases already exists
         */
        push(unit: Unit): void;
        /**
         * get the unit by its phrase
         * @param {string} phrase
         * @returns {UnitMeta | null }
         */
        get(phrase: string): UnitMeta | null;
    }
}
export { Unit, UnitMeta, callbackFuncFmt, IUseUnit };