Minor code and style fixes (#5398)

* type fixes

* import fixes

* fix typos

* fix warning for private props that init in ctor only

* typing fixes

* typing fixes

* style cleanup

* fix test template

lib/insights/src/lib/diagram/components/diagram.element.options.ts

@@ -0,0 +1,24 @@
+/*!
+ * @license
+ * Copyright 2019 Alfresco Software, 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.
+ */
+
+export interface DiagramElementOptions {
+    stroke?: string;
+    fillColors?: string;
+    fillOpacity?: string;
+    strokeWidth?: number;
+    radius?: number;
+}