text: import toInteger from '../toInteger/index.js'
  import getUTCWeekYear from '../getUTCWeekYear/index.js'
  import startOfUTCWeek from '../startOfUTCWeek/index.js'
  
  // This function will be a part of public API when UTC function will be implemented.
  // See issue: https://github.com/date-fns/date-fns/issues/376
  export default function startOfUTCWeekYear(dirtyDate, dirtyOptions) {
    if (arguments.length < 1) {
      throw new TypeError(
        '1 argument required, but only ' + arguments.length + ' present'
      )
    }
  
    var options = dirtyOptions || {}
    var locale = options.locale
    var localeFirstWeekContainsDate =
      locale && locale.options && locale.options.firstWeekContainsDate
    var defaultFirstWeekContainsDate =
      localeFirstWeekContainsDate == null
        ? 1
        : toInteger(localeFirstWeekContainsDate)
    var firstWeekContainsDate =
      options.firstWeekContainsDate == null
        ? defaultFirstWeekContainsDate
        : toInteger(options.firstWeekContainsDate)
  
    var year = getUTCWeekYear(dirtyDate, dirtyOptions)
    var firstWeek = new Date(0)
    firstWeek.setUTCFullYear(year, 0, firstWeekContainsDate)
    firstWeek.setUTCHours(0, 0, 0, 0)
    var date = startOfUTCWeek(firstWeek, dirtyOptions)
    return date
  }
  