polish-validators/dist/esm/credit-card.js

A set of validator functions that check common polish numbers.

import { removeDashesAndWhitespace } from './_utils';
const CREDIT_CARD_REGEX = /^\d{16}$/;
/**
 * Validates a credit card number using the Luhn algorithm. The function requires a
 * 16-digit credit card number. Any dashes or whitespace are ignored.
 *
 * @param {string} number - The 16-digit credit card number as a string.
 * @returns {boolean} `true` if the credit card number is valid; `false` otherwise.
 */
export function isCreditCardNumberValid(number) {
    number = removeDashesAndWhitespace(number);
    if (!CREDIT_CARD_REGEX.test(number)) {
        return false;
    }
    let checkSum = 0;
    let digits = '';
    let v = 0;
    for (let i = 0; i < number.length; i++) {
        v = parseInt(number[i]);
        if (i % 2 === 0) {
            v *= 2;
        }
        digits += v.toString();
    }
    for (let i = 0; i < digits.length; i++) {
        checkSum += parseInt(digits[i]);
    }
    return checkSum % 10 === 0;
}
/**
 * Validates a credit card number using the Luhn algorithm. The function requires a
 * 16-digit credit card number. Any dashes or whitespace are ignored.
 *
 * @param {string} number - The 16-digit credit card number as a string.
 * @returns {boolean} `true` if the credit card number is invalid; `false` otherwise.
 */
export const isCreditCardNumberInvalid = (number) => !isCreditCardNumberValid(number);
export const CreditCardType = {
    Airline: 'airline',
    ClubCard: 'clubcard',
    Visa: 'visa',
    MasterCard: 'mastercard',
    Finances: 'finances',
    Fuel: 'fuel',
    Telecommunication: 'telecommunication',
    Other: 'other',
};
/**
 * Determines the type of credit card based on the first digit of the card number.
 *
 * @param {string} number - The credit card number as a string.
 * @returns {CreditCardType | null} The credit card type, or `null` if the type cannot
 * be determined.
 */
export function getCreditCardType(number) {
    switch (parseInt(number[0])) {
        case 1:
        case 2:
            return CreditCardType.Airline;
        case 3:
            return CreditCardType.ClubCard;
        case 4:
            return CreditCardType.Visa;
        case 5:
            return CreditCardType.MasterCard;
        case 6:
            return CreditCardType.Finances;
        case 7:
            return CreditCardType.Fuel;
        case 8:
            return CreditCardType.Telecommunication;
        case 9:
            return CreditCardType.Other;
        default:
            return null;
    }
}