Get region code from international phone number using javascript google-libphonenumber

libphonenumber_regioncode_from_international_number.md

const phoneUtil = require('google-libphonenumber').PhoneNumberUtil.getInstance();
const PNF = require('google-libphonenumber').PhoneNumberFormat;

const phoneNumber = '0461234567';
const regionCode = 'fi';
const parsed = phoneUtil.parse(phoneNumber, regionCode);
const internationalNumber = phoneUtil.format(parsed, PNF.INTERNATIONAL);
const internationalParsed = phoneUtil.parse(internationalNumber);
const regionCodeFromInternationalNumber = phoneUtil.getRegionCodeForNumber(internationalParsed);

console.log(`Region code is ${regionCodeFromInternationalNumber}`
  + ` for international phone number ${internationalNumber}`
);