react-phone-number-input/modules/helpers/getInternationalPhoneNumberPrefix.js

Telephone number input React component

import { getCountryCallingCode, Metadata } from 'libphonenumber-js/core';
var ONLY_DIGITS_REGEXP = /^\d+$/;
export default function getInternationalPhoneNumberPrefix(country, metadata) {
  // Standard international phone number prefix: "+" and "country calling code".
  var prefix = '+' + getCountryCallingCode(country, metadata); // Get "leading digits" for a phone number of the country.
  // If there're "leading digits" then they can be part of the prefix too.

  metadata = new Metadata(metadata);
  metadata.country(country);

  if (metadata.numberingPlan.leadingDigits() && ONLY_DIGITS_REGEXP.test(metadata.numberingPlan.leadingDigits())) {
    prefix += metadata.numberingPlan.leadingDigits();
  }

  return prefix;
}
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