Tsoverlay fix for checkeroptions (#252)

* fixes tsoverlay checkeroption to be empty

* Change files

change/just-scripts-2019-09-27-16-29-07-tsoverlay-fix.json

@@ -0,0 +1,8 @@
+{
+  "type": "patch",
+  "comment": "fixes tsoverlay checkeroption to be empty",
+  "packageName": "just-scripts",
+  "email": "odbuild@microsoft.com",
+  "commit": "ed1df82eafbed9f7576f00665dd6705a32064dcf",
+  "date": "2019-09-27T23:29:07.841Z"
+}

packages/just-scripts/src/webpack/overlays/tsOverlay.ts

@@ -56,9 +56,7 @@ export const tsOverlay = (overlayOptions?: TsOverlayOptions) => {
     transpileOnly: true
   };
 
-  overlayOptions.checkerOptions = overlayOptions.loaderOptions || {
-    transpileOnly: true
-  };
+  overlayOptions.checkerOptions = overlayOptions.checkerOptions || {};
 
   return {
     resolve: {