Merge pull request #275 from OfficeDev/TS-config-best-practices

TS config best practices and ensure that '=>' transpiles

Author: Rick-Kirkham

babel.config.json

@@ -1,3 +1,13 @@
 {
-  "presets": ["@babel/preset-typescript"]
-}
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "esmodules": false
+        }
+      }
+    ],
+    "@babel/preset-typescript"
+  ]
+}