@dnb/eufemia/shared/detectCountryCode.js

DNB Eufemia Design System UI Library

import countryCodes from "./constants/countryCodes.js";
const strippedCodes = Array.from(new Set(countryCodes.map(c => c.replace(/-/g, '')))).sort((a, b) => b.length - a.length || a.localeCompare(b));
const cdcFormatMap = Object.fromEntries(countryCodes.map(c => [c.replace(/-/g, ''), c]));
export default function detectCountryCode(value) {
  if (typeof value !== 'string') {
    return undefined;
  }
  if (value.startsWith('00')) {
    value = `+${value.slice(2)}`;
  }
  if (!value.startsWith('+')) {
    return undefined;
  }
  const digits = value.slice(1);
  if (cdcFormatMap[digits] && cdcFormatMap[digits].includes('-')) {
    return {
      countryCode: `+${cdcFormatMap[digits]}`,
      phoneNumber: ''
    };
  }
  for (const code of strippedCodes) {
    if (digits.startsWith(code) && digits.length > code.length) {
      return {
        countryCode: `+${cdcFormatMap[code] || code}`,
        phoneNumber: digits.slice(code.length)
      };
    }
  }
  return undefined;
}
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