refactor(reactive): update tsconfig

tsconfig.json

@@ -4,7 +4,7 @@
     "moduleResolution": "node",
     "jsx": "react",
     "module": "commonjs",
-    "target": "es2015",
+    "target": "es5",
     "allowJs": false,
     "noUnusedLocals": false,
     "removeComments": true,