import { ValidationResult } from './types';
export declare function calculateCheckDigit(digits: ReadonlyArray<number>, multipliers: ReadonlyArray<number>): number;
export declare function stringToDigitArray(input: string): ReadonlyArray<number>;
export declare function removeNonDigits(input: string): string;
export declare function areAllDigitsSame(input: string): boolean;
export declare function stripDocumentFormatting(input: string): string;
export declare function removeNonAlphanumeric(input: string): string;
export declare function charToBase36Value(char: string): number;
export declare function stringToBase36ValueArray(input: string): ReadonlyArray<number>;
export declare function validResult(): ValidationResult;
export declare function invalidResult(error?: string): ValidationResult;