systemJsConfigWithES6Sniffing.htm

<script src="https://featuretests.io/rs.js"></script>
<script>
    var isEs6 = false;
    function webSocketAddress(path){
        return 'ws://' + window.location.host + (path || '');
    }

    var isDev = /localhost:3000/.test(window.location.href);
    if (isDev){
        loadSystemJs();
    } else {
        new Promise(function (res) {
            setTimeout(res, 500);
            window["Reflect.supports"]("all", function (results) {
                var needed = ['arrow', 'class', 'classes', 'conciseMethodProperty', 'constLoop', 'defaultParameter', 'destructuring',
                              'forOf', 'generator', 'letConst', 'letLoop', 'letLoopScope', 'letTDZ', 'spreadRest', 'templateString']
                isEs6 = !needed.some(function (prop) { return !results[prop] });
                res();
            });
        }).then(loadSystemJs);
    }

    function loadSystemJs() {
        var config = isDev ? systemJsDevConfig : systemJsLiveConfig;
        if (!isDev){
            config.map['dist-bundles'] = isEs6 ? 'dist-es6' : 'dist-es5';
            config.bundles = gBundlePathsTranspiled;
        }
        System.config(config);
        System.import('reactStartup');
    }
</script>