Function loadDatesFields

packages/intl-datetimeformat/scripts/extract-dates.ts:167–515

(
  locale: string
)

const tzToMetaZoneMap = extractTimezoneToMetazoneMap()

async function loadDatesFields(
  locale: string
): Promise<RawDateTimeLocaleInternalData> {
  const [caGregorianImport, tznImport, numbersImport] = await Promise.all([
    import(`cldr-dates-full/main/${locale}/ca-gregorian.json`, {
      with: {type: 'json'},
    }) as Promise<{default: typeof DateFields}>,
    import(`cldr-dates-full/main/${locale}/timeZoneNames.json`, {
      with: {type: 'json'},
    }) as Promise<{default: typeof TimeZoneNames}>,
    import(`cldr-numbers-full/main/${locale}/numbers.json`, {
      with: {type: 'json'},
    }).catch(_ => undefined) as Promise<
      {default: typeof NumberFields} | undefined
    >,
  ])
  const gregorian =
    caGregorianImport.default.main[locale as 'en'].dates.calendars.gregorian
  const timeZoneNames =
    tznImport.default.main[locale as 'en'].dates.timeZoneNames
  const numbers = numbersImport?.default.main[locale as 'en'].numbers
  const nu = numbers
    ? numbers.defaultNumberingSystem === 'latn'
      ? ['latn']
      : [numbers.defaultNumberingSystem, 'latn']
    : []

  let hc: string[] = []
  let region: string | undefined
  try {
    if (locale !== 'root') {
      region = new IntlLocale(locale).maximize().region
    }
    // Reduce the date fields data down to allowlist of fields needed in the
    // FormatJS libs.
    hc = (
      processedTimeData[locale] ||
      processedTimeData[region || ''] ||
      processedTimeData[`${locale}-001`] ||
      processedTimeData['001']
    ).map(resolveDateTimeSymbolTable)
    // Ensure all locales support at least one 24-hour and one 12-hour format
    // This allows users to explicitly override via hourCycle option per ECMA-402 spec
    // See: https://github.com/formatjs/formatjs/issues/6020
    if (!hc.includes('h23') && !hc.includes('h24')) {
      hc.push('h23')
    }
    if (!hc.includes('h12') && !hc.includes('h11')) {
      hc.push('h12')
    }
  } catch (e) {
    console.error(`Issue extracting hourCycle for ${locale}`)
    throw e
  }
  let timeZoneName: RawDateTimeLocaleInternalData['timeZoneName'] = {}
  try {
    timeZoneName = !timeZoneNames.metazone
      ? {}