How to use the quasar.LocalStorage.has function in quasar

toggle (key) {
      if (LocalStorage.has(key)) {
        LocalStorage.remove(key)
      }
      else {
        LocalStorage.set(key, `${key}-value`)
      }
      this.update()
    },
    clear () {

created () {
    if (!LocalStorage.has('lists')) {
      LocalStorage.set('lists', [])
    }
    this.$root.lists = LocalStorage.get.item('lists')
  },
  methods: {

mounted () {
    if (LocalStorage.has('chosen')) {
      dispatch({type: 'LOAD_LOCAL_CHOSEN'})
    }

    if (!this.state.spells.loaded) {
      fetchSpells()
    }
  }
}