A JS file to initialise flexslider.js in Drupal 8

flexslider-init.js

(function ($, Drupal) {

  'use strict';

  /**
   * Initialise the flexslider JS.
   */
  Drupal.behaviors.felxsliderInit = {
    attach: function (context, settings) {
      var slider = $(context).find('.js-slider');
      if (slider.length) {
        $(slider).flexslider({
          animation: "slide",
          selector: ".homepage__slider .slider__slide"
        });
      }
    }
  };

})(jQuery, Drupal);