nfp_sites/nfp_moe/app/darkmode.js

const storageName = 'darkmode'

const Darkmode = {
  darkIsOn: false,

  setDarkMode: function(setOn) {
    if (setOn) {
      localStorage.setItem(storageName, true)
      document.body.className = 'darkmodeon' + ' ' + (window.supportsavif ? 'avifsupport' : 'jpegonly')
      Darkmode.darkIsOn = true
    } else {
      localStorage.removeItem(storageName)
      document.body.className = 'daymode' + ' ' + (window.supportsavif ? 'avifsupport' : 'jpegonly')
      Darkmode.darkIsOn = false
    }
  },

  isOn: function() {
    return Darkmode.darkIsOn
  },
}

Darkmode.darkIsOn = localStorage.getItem(storageName)

module.exports = Darkmode