Bootstrap version detect

bootstrap-version-detect.js

/**
 * Hacks to detect Bootstrap version (2 vs. 3) from JavaScript.
 * Does some detection of stringified functions - should be safe against most minification, but please test!
 * 
 * Example:
 * ```js
 * bootstrapVersionDetect.isVersion('2', $);
 * ```
 * 
 * May not be necessary soon for Bootstrap 3+, @see https://github.com/twbs/bootstrap/pull/13578
 */
define([] , function () {

	var bootstrapVersionDetect = {};

	/**
	 * 
	 * @param $ A jQuery instance loaded with Bootstrap plugins.
	 * @param {string} [pluginName=modal] Optional Bootstrap plugin name used to detect version,
	 *   if the default 'modal' plugin used isn't included in your JS.
	 * @return {string} Bootstrap version string, or empty string on failure to lookup.
	 */
	bootstrapVersionDetect.getVersion = function ($, pluginName) {
		if (! $) throw new Error('bootstrap-version-detect needs a jQuery instance');
		pluginName = pluginName || 'modal';
		var pluginFn = $.fn[pluginName];
		if (pluginFn) {
			if (pluginFn.VERSION) {
				return pluginFn.VERSION;
			}
			if (pluginName === 'modal') {
				// Bootstrap 2 doesn't use namespace on modal data (at least for now...)
				return pluginFn.toString().indexOf('bs.modal') === -1 ? '2.x' : '3.x';
			}
		}
		return '';
	};

	/**
	 * Check for Bootstrap version. If we can't detect the version, returns false.
	 * 
	 * @param {string} version A version string to check for, e.g. '2' or '3.2'.
	 * @param $
	 * @param {string} [pluginName]
	 * @return {boolean}
	 */
	bootstrapVersionDetect.isVersion = function (version, $, pluginName) {
		version = typeof version === 'string' ? version : version + ''; // coerce to string
		var detectedVersion = bootstrapVersionDetect.getVersion($, pluginName);
		return !! ( detectedVersion && ( detectedVersion.indexOf(version) === 0 ) );
	};

	return bootstrapVersionDetect;
});

bootstrap-version-detect.test.js

define(['bootstrap-version-detect'], function (bootstrapVersionDetect) {
	describe('detect bootstrap version', function () {
		it('should detect 2 correctly', function (done) {
			require(['jquery', 'bootstrap2'], function ($) {
				assert.ok(bootstrapVersionDetect.isVersion('2', $));
				assert.notOk(bootstrapVersionDetect.isVersion('3', $));
				done();
			});
		});
		it('should detect 3 correctly', function (done) {
			require(['jquery', 'bootstrap3'], function ($) {
				assert.ok(bootstrapVersionDetect.isVersion('3', $));
				assert.notOk(bootstrapVersionDetect.isVersion('2', $));
				done();
			});
		});
	});
});