const instance = new BoxSelection({
  container: document.getElementById('container'), // The scope in which BoxSelection should function.
  itemSelector: '.item', // The CSS class BoxSelection will use to target items.
  selectedClass: '.selected', // The CSS class that will be added to the HTML elements that fall within the selection box.
  selectionClass: '.selection', // The CSS class that will be added to the selection box.
  mode: 'loose', // 'loose' or 'strict'
  onSelectionChange: (selectedItems) => {
    console.log(selectedItems) // Array of HTML elements that fall within the selection box.
  }
})

instance.unbind() // Function you can call to unbind all of BoxSelection's events.