chore: commnet in babel

.babelrc

@@ -0,0 +1,27 @@
+// Parceljs cann't compile babel.config.js
+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "modules": false
+      }
+    ]
+  ],
+  "plugins": ["transform-vue-jsx", "@babel/plugin-transform-object-assign"],
+  "env": {
+    "test": {
+      "presets": [
+        [
+          "@babel/preset-env",
+          {
+            "targets": {
+              "node": "current"
+            }
+          }
+        ]
+      ],
+      "plugins": ["transform-vue-jsx"]
+    }
+  }
+}

babel.config.js

@@ -1,3 +1,4 @@
+// need to compile node_modules (eg: vue-runtime-helps)
 module.exports = api => {
   api.cache(false);
   return {