source: node_modules/classnames/bind.js

/*!
        Copyright (c) 2018 Jed Watson.
        Licensed under the MIT License (MIT), see
        http://jedwatson.github.io/classnames
*/
/* global define */

(function () {
        'use strict';

        var hasOwn = {}.hasOwnProperty;

        function classNames () {
                var classes = '';

                for (var i = 0; i < arguments.length; i++) {
                        var arg = arguments[i];
                        if (arg) {
                                classes = appendClass(classes, parseValue.call(this, arg));
                        }
                }

                return classes;
        }

        function parseValue (arg) {
                if (typeof arg === 'string' || typeof arg === 'number') {
                        return this && this[arg] || arg;
                }

                if (typeof arg !== 'object') {
                        return '';
                }

                if (Array.isArray(arg)) {
                        return classNames.apply(this, arg);
                }

                if (arg.toString !== Object.prototype.toString && !arg.toString.toString().includes('[native code]')) {
                        return arg.toString();
                }

                var classes = '';

                for (var key in arg) {
                        if (hasOwn.call(arg, key) && arg[key]) {
                                classes = appendClass(classes, this && this[key] || key);
                        }
                }

                return classes;
        }

        function appendClass (value, newClass) {
                if (!newClass) {
                        return value;
                }
        
                if (value) {
                        return value + ' ' + newClass;
                }
        
                return value + newClass;
        }

        if (typeof module !== 'undefined' && module.exports) {
                classNames.default = classNames;
                module.exports = classNames;
        } else if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
                // register as 'classnames', consistent with npm package name
                define('classnames', [], function () {
                        return classNames;
                });
        } else {
                window.classNames = classNames;
        }
}());