chore: update babel.config.js

babel.config.js

@@ -1,3 +1,7 @@
 module.exports = {
   presets: ["@vue/cli-plugin-babel/preset"],
+  plugins: [
+    "@babel/plugin-proposal-nullish-coalescing-operator",
+    "@babel/plugin-proposal-optional-chaining",
+  ],
 };