code: function filterOptions(options, value)
  {
  	// If the input value is `undefined` or empty.
  	if (!value) {
  		return options
  	}
  
  	value = value.toLowerCase()
  
  	return options.filter(({ label }) => label.toLowerCase().indexOf(value) >= 0)
  }
docs: Filters options by substring inclusion (case-insensitive).