export type Digit = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9;
export type Period = [Digit, Digit, Digit];
export type InputNumber = string | bigint;
export interface NumberData {
    isNegative: boolean;
    integralPart: Period[];
    fractionalPart: Digit[];
}
/**
 * The base error class for all errors in the library.
 */
export declare class ReadVietnameseNumberError extends Error {
}
/**
 * The error class used when the input number is invalid.
 */
export declare class InvalidNumberError extends ReadVietnameseNumberError {
}
/**
 * The reading configuration class containing default options for reading numbers.
 */
export declare class ReadingConfig {
    static readonly PERIOD_SIZE = 3;
    static readonly FILLED_DIGIT = "0";
    negativeSign: string;
    pointSign: string;
    thousandSign: string;
    separator: string;
    unit: string[];
    units: string[][];
    digits: string[];
    negativeText: string;
    pointText: string;
    oddText: string;
    tenText: string;
    hundredText: string;
    oneToneText: string;
    fourToneText: string;
    fiveToneText: string;
    tenToneText: string;
    skipTenTone: boolean;
}