import { Locale } from "../Locale";
/**
 * This utility class consists exclusively of the static methods that operate on numeric values with localization taking into account
 * @since 0.4.0
 * @license MIT, (c) 2022 ALEXANDER STRELKOV, alv.strelkov@gmail.com
 */
export declare class NumberSpeller {
    /**
     *
     * @param amount
     * @param thousandGroup
     * @param words
     * @param options
     * @returns
     */
    private static _digitGroup;
    /**
     * Converts an integer value in words
     * @param value A number to convert
     * @param options An object containing certain properties and their values
     * @returns String
     * @static
     */
    static spellInteger(value: number, options?: {
        locale?: string | Locale;
    }): string;
    /**
     * Converts amount of money in words
     * @param value  Sum to convert
     * @param options Configuration object
     * @returns String
     * @throws Error if the _locale_ value is invalid in `options`
     * @static
     */
    static spellCurrency(value: number, options?: {
        currency?: string;
        locale?: string | Locale;
        fractionAsNumber?: boolean;
    }): string;
    /**
     * Gets the result of the specified _unit_ formatting
     * @param value A value in units
     * @param unit Required value in unit formatting. Possible values are [core unit identifiers](https://tc39.es/proposal-unified-intl-numberformat/section6/locales-currencies-tz_proposed_out.html#sec-issanctionedsimpleunitidentifier) that was selected for use in ECMAScript. Pairs of simple units can be concatenated with "-per-" to make a compound unit.
     * @param options Configuration object
     * @returns String
     * @throws Error if the _locale_ value is invalid in `options`
     * @static
     */
    static spellUnit(value: number, unit: string, options?: {
        locale?: string | Locale;
        unitDisplay?: "long" | "short" | "narrow";
        valueAsNumber?: boolean;
    }): string;
}