Update ServerTypeSelector for registration to use a server config

src/utils/TypeUtils.js

@@ -0,0 +1,30 @@
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/**
+ * Creates a class of a given type using the objects defined. This
+ * is a stopgap function while we don't have TypeScript interfaces.
+ * In future, we'd define the `type` as an interface and just cast
+ * it instead of cheating like we are here.
+ * @param {Type} Type The type of class to construct.
+ * @param {*} opts The options (properties) to set on the object.
+ * @returns {*} The created object.
+ */
+export function makeType(Type: any, opts: any) {
+    const c = new Type();
+    Object.assign(c, opts);
+    return c;
+}