refactor(flatten-threads): migrate to the new DI architecture

Bug: twpowertools:176
Change-Id: I7a24fb504ce53697112f11128d2d5249a5a7c7e7
diff --git a/src/infrastructure/presentation/nodeWatcher/handlers/CssSelectorHandler.adapter.ts b/src/infrastructure/presentation/nodeWatcher/handlers/CssSelectorHandler.adapter.ts
index bf57020..5617130 100644
--- a/src/infrastructure/presentation/nodeWatcher/handlers/CssSelectorHandler.adapter.ts
+++ b/src/infrastructure/presentation/nodeWatcher/handlers/CssSelectorHandler.adapter.ts
@@ -28,5 +28,5 @@
     return this.cssSelector;
   }
 
-  abstract onMutatedNode(nodeMutation: NodeMutation): void;
+  abstract onMutatedNode(nodeMutation: NodeMutation<HTMLElement>): void;
 }