se-panfilov/jsvat

import { Country } from '../jsvat';

export const france: Country = {
  name: 'France',
  codes: ['FR', 'FRA', '250'],
  calcFn: (vat: string): boolean => {
    let total;

    // Checks the check digits of a French VAT number.
    if (!/^\d{11}$/.test(vat)) return true;

    // Extract the last nine digits as an integer.
    total = Number(vat.substring(2));

    // Establish check digit.
    total = (total * 100 + 12) % 97;

    // Compare it with the last character of the VAT number. If it's the same, then it's valid.
    const expect = Number(vat.slice(0, 2));
    return total === expect;
  },
  rules: {
    multipliers: {},
    regex: [/^(FR)(\d{11})$/, /^(FR)([A-HJ-NP-Z]\d{10})$/, /^(FR)(\d[A-HJ-NP-Z]\d{9})$/, /^(FR)([A-HJ-NP-Z]{2}\d{9})$/]
  }
};