cloud-8.x-2.0-beta1/modules/cloud_service_providers/aws_cloud/js/aws_cloud_config.js

(function ($, Drupal) {
  'use strict';

  Drupal.CloudConfig = Drupal.CloudConfig || {};

  Drupal.CloudConfig = {
    showHide: function (element) {
      if ($(element).is(':checked')) {
        $('#edit-field-access-key-wrapper').hide();
        $('#edit-field-secret-key-wrapper').hide();
      }
      else {
        $('#edit-field-access-key-wrapper').show();
        $('#edit-field-secret-key-wrapper').show();
      }
    }
  };

  Drupal.behaviors.cloudConfig = {
    attach: function (context, settings) {
      $('#edit-field-use-instance-credentials-value', context).change(function () {
        Drupal.CloudConfig.showHide(this);
      });

      Drupal.CloudConfig.showHide($('#edit-field-use-instance-credentials-value'));
    }
  };

})(jQuery, Drupal);