libphonenumber-js/es6-modern/helpers/getCountryByCallingCode.js

A simpler (and smaller) rewrite of Google Android's libphonenumber library in javascript

import getCountryByNationalNumber from './getCountryByNationalNumber.js';
const USE_NON_GEOGRAPHIC_COUNTRY_CODE = false;

/**
 * Returns the exact country that a given national (significant) number belongs to
 * in case of ambiguity, i.e. when multiple countries share the same "country calling code".
 * @param {string} [callingCode]
 * @param {string} [options.nationalNumber] — National (significant) number.
 * @param {Metadata} options.metadata — Metadata instance.
 * @returns {string?} Returns the most suitable country for this calling code and national (significant) number.
 */
export default function getCountryByCallingCode(callingCode, {
  nationalNumber,
  metadata
}) {
  /* istanbul ignore if */
  if (USE_NON_GEOGRAPHIC_COUNTRY_CODE) {
    if (metadata.isNonGeographicCallingCode(callingCode)) {
      return '001';
    }
  }
  const possibleCountries = metadata.getCountryCodesForCallingCode(callingCode);
  if (!possibleCountries) {
    return;
  }
  // If there's just one country corresponding to the country code,
  // then just return it, without further phone number digits validation.
  if (possibleCountries.length === 1) {
    return possibleCountries[0];
  }
  return getCountryByNationalNumber(nationalNumber, possibleCountries, metadata.metadata);
}
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