include types folder

Author: Agney

playground/tsconfig.json

@@ -10,7 +10,8 @@
     "typeRoots": [
       "./node_modules/@types",
       "../node_modules/@types",
-      "./src/types"
+      "src/types"
     ]
-  }
+  },
+  "include": ["src/types"]
 }