source: public/vendors/dataTable/Buttons-1.6.1/js/buttons.bootstrap4.js

/*! Bootstrap integration for DataTables' Buttons
 * ©2016 SpryMedia Ltd - datatables.net/license
 */

(function( factory ){
        if ( typeof define === 'function' && define.amd ) {
                // AMD
                define( ['jquery', 'datatables.net-bs4', 'datatables.net-buttons'], function ( $ ) {
                        return factory( $, window, document );
                } );
        }
        else if ( typeof exports === 'object' ) {
                // CommonJS
                module.exports = function (root, $) {
                        if ( ! root ) {
                                root = window;
                        }

                        if ( ! $ || ! $.fn.dataTable ) {
                                $ = require('datatables.net-bs4')(root, $).$;
                        }

                        if ( ! $.fn.dataTable.Buttons ) {
                                require('datatables.net-buttons')(root, $);
                        }

                        return factory( $, root, root.document );
                };
        }
        else {
                // Browser
                factory( jQuery, window, document );
        }
}(function( $, window, document, undefined ) {
'use strict';
var DataTable = $.fn.dataTable;

$.extend( true, DataTable.Buttons.defaults, {
        dom: {
                container: {
                        className: 'dt-buttons btn-group flex-wrap'
                },
                button: {
                        className: 'btn btn-secondary'
                },
                collection: {
                        tag: 'div',
                        className: 'dropdown-menu',
                        button: {
                                tag: 'a',
                                className: 'dt-button dropdown-item',
                                active: 'active',
                                disabled: 'disabled'
                        }
                }
        },
        buttonCreated: function ( config, button ) {
                return config.buttons ?
                        $('<div class="btn-group"/>').append(button) :
                        button;
        }
} );

DataTable.ext.buttons.collection.className += ' dropdown-toggle';
DataTable.ext.buttons.collection.rightAlignClassName = 'dropdown-menu-right';

return DataTable.Buttons;
}));