Function weekNumberingYearGetter

packages/common/src/i18n/format_date.ts:559–570

* Returns a date formatter that provides the week-numbering year for the input date.

(size: number, trim = false)

 * Returns a date formatter that provides the week-numbering year for the input date.
 */
function weekNumberingYearGetter(size: number, trim = false): DateFormatter {
  return function (date: Date, locale: string) {
    const thisThurs = getThursdayThisIsoWeek(date);
    const weekNumberingYear = thisThurs.getFullYear();
    return padNumber(
      weekNumberingYear,
      size,
      getLocaleNumberSymbol(locale, NumberSymbol.MinusSign),
      trim,
    );
  };
}

type DateFormatter = (date: Date, locale: string, offset: number) => string;