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);

  // "Leading digits" can't be used to rule out any countries.
  // So the "pre-fill with leading digits on country selection" feature had to be reverted.
  // https://gitlab.com/catamphetamine/react-phone-number-input/-/issues/10#note_1231042367
  // // Get "leading digits" for a phone number of the country.
  // // If there're "leading digits" then they can be part of the prefix too.
  // // https://gitlab.com/catamphetamine/react-phone-number-input/-/issues/10
  // metadata = new Metadata(metadata)
  // metadata.selectNumberingPlan(country)
  // // "Leading digits" patterns are only defined for about 20% of all countries.
  // // By definition, matching "leading digits" is a sufficient but not a necessary
  // // condition for a phone number to belong to a country.
  // // The point of "leading digits" check is that it's the fastest one to get a match.
  // // https://gitlab.com/catamphetamine/libphonenumber-js/blob/master/METADATA.md#leading_digits
  // const leadingDigits = metadata.numberingPlan.leadingDigits()
  // if (leadingDigits && ONLY_DIGITS_REGEXP.test(leadingDigits)) {
  // 	prefix += leadingDigits
  // }

  return prefix;
}
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