import { Digit, InputNumber, NumberData, Period, ReadingConfig } from './type.js';
/**
 * Read the last two digits of a number.
 *
 * @param config the reading configuration
 * @param b the digit in the tens place
 * @param c the digit in the units place
 * @returns an array of words
 */
export declare function readLastTwoDigits(config: ReadingConfig, b: Digit, c: Digit): string[];
/**
 * Read three digits in a period of a number.
 *
 * @param config the reading configuration
 * @param a the digit in the hundreds place
 * @param b the digit in the tens place
 * @param c the digit in the units place
 * @param readZeroHundred whether to read "zero" in the hundreds place
 * @returns an array of words
 */
export declare function readThreeDigits(config: ReadingConfig, a: Digit, b: Digit, c: Digit, readZeroHundred: boolean): string[];
/**
 * Remove thousands separators from the number string.
 *
 * @param config the reading configuration
 * @param number the number string
 * @returns the number string without thousands separators
 */
export declare function removeThousandsSeparators(config: ReadingConfig, number: string): string;
/**
 * Remove redundant zeros from the number string from both ends.
 *
 * @param config the reading configuration
 * @param number the number string
 * @returns the number string without redundant zeros from both ends
 */
export declare function trimRedundantZeros(config: ReadingConfig, number: string): string;
/**
 * Add leading zeros to the number string so its length is a multiple of the period size.
 *
 * @param number the number string
 * @returns the number string with leading zeros added
 */
export declare function addLeadingZerosToFitPeriod(number: string): string;
/**
 * Group the digits in the integral part into periods of three digits each.
 *
 * @param digits the digits in the integral part
 * @returns an array of periods
 */
export declare function zipIntegralPeriods(digits: Digit[]): Period[];
/**
 * Parse the number string into a number data.
 *
 * @param config the reading configuration
 * @param number the number string
 * @returns a parsed number data
 * @throws InvalidNumberError if the number string is invalid
 */
export declare function parseNumberData(config: ReadingConfig, number: string): NumberData;
/**
 * Read the periods in the integral part of a number.
 *
 * @param config the reading configuration
 * @param periods the periods in the integral part
 * @returns an array of words
 */
export declare function readIntegralPart(config: ReadingConfig, periods: Period[]): string[];
/**
 * Read the digits in the fractional part of a number.
 *
 * @param config the reading configuration
 * @param digits the digits in the fractional part
 * @returns an array of words
 */
export declare function readFractionalPart(config: ReadingConfig, digits: Digit[]): string[];
/**
 * Read the parsed number data.
 *
 * @param config the reading configuration
 * @param numberData the parsed number data
 * @returns a string representation of the number
 */
export declare function readNumber(config: ReadingConfig, numberData: NumberData): string;
/**
 * Validate, parse, and read the input number.
 *
 * @param number the input number
 * @param config the reading configuration
 * @returns a string representation of the number
 */
export declare function doReadNumber(number: InputNumber, config?: ReadingConfig): string;