Function shouldPolyfill

packages/intl-pluralrules/should-polyfill.ts:12–22

(locale = 'en')

}

export function shouldPolyfill(locale = 'en'): string | undefined {
  if (
    typeof Intl === 'undefined' ||
    !('PluralRules' in Intl) ||
    new Intl.PluralRules('en', {minimumFractionDigits: 2} as any).select(1) ===
      'one' ||
    !supportedLocalesOf(locale)
  ) {
    return locale ? match([locale], supportedLocales, 'en') : undefined
  }
}