Add babel plugin to prod build

Author: CompuIves

packages/app/config/babel.prod.js

@@ -30,6 +30,7 @@ module.exports = {
     require.resolve('@babel/plugin-transform-async-to-generator'),
     require.resolve('@babel/plugin-proposal-object-rest-spread'),
     require.resolve('@babel/plugin-proposal-class-properties'),
+    require.resolve('@babel/plugin-proposal-optional-chaining'),
     require.resolve('@babel/plugin-transform-runtime'),
     require.resolve('babel-plugin-lodash'),
     require.resolve('@babel/plugin-syntax-dynamic-import'),