classnames/index.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(arg));
			}
		}

		return classes;
	}

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

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

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