import { InputNumber, NormalizeOptions, SpellerConfig } from './types';
/**
 * Validates an input number, ensures it's a valid string representation.
 * @param input The input number to validate
 * @param config NormalizeOptions
 * @returns A valid string representation of the number
 */
export declare function cleanInputNumber(input: InputNumber, config: NormalizeOptions): string;
/**
 * Normalizes a number string by cleaning whitespace and special characters.
 * Compatible with IE11 and older browsers.
 * @param input The string to normalize
 * @param options Options for normalization
 * @returns Normalized number string
 */
export declare function normalizeNumberString(input: string, options?: NormalizeOptions): string;
/**
 * Removes leading zeros from a string
 * @param str The input string
 * @param char The character to trim (default '0')
 * @returns The string with leading chars removed
 */
export declare function trimLeft(str: string, char?: string): string;
/**
 * Removes trailing zeros from a string
 * @param str The input string
 * @param char The character to trim (default '0')
 * @returns The string with trailing chars removed
 */
export declare function trimRight(str: string, char?: string): string;
/**
 * Trims redundant zeros at the beginning and end of a number string with configurable behavior
 * For integral part: trims leading zeros but always keeps at least one if at start
 * For fractional part: trims trailing zeros with configurable behavior
 * @param config Configuration object with trim settings
 * @param numberStr The number string to process
 * @returns The trimmed number string
 */
export declare function handleRedundantZeros(config: SpellerConfig, numberStr: string): string;