(function (tms, window, $) {
  // Put any variables you need for the header stuff up here
  const header = $('header-class')

  // Have your toggle class function here,
  // then put any other functions related to the header in this area
  function toggleBackground() {
    header.toggleClass('class-to-add')
  }

  // Any functions that you need available in your application elsewhere,
  // put them inside of this
  tms.header = {
    showBackground: toggleBackground
  }
})(window.tms = window.tms || {}, window, jQuery);