creditCard formatCreditCardNumber.ts

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  import { number } from 'card-validator';
 
import unformatCreditCardNumber from './unformatCreditCardNumber';
 
export default function formatCreditCardNumber(value: string, separator: string = ' '): string {
    const { card } = number(value);
 
    if (!card) {
        return value;
    }
 
    const unformattedValue = unformatCreditCardNumber(value, separator);
 
    return card.gaps
        .filter(gapIndex => unformattedValue.length > gapIndex)
        .reduce((output, gapIndex, index) => (
            [
                output.slice(0, gapIndex + index),
                output.slice(gapIndex + index),
            ].join(separator)
        ), unformattedValue);
}