Silence a webpack warning

babel.config.js

@@ -53,6 +53,8 @@ module.exports = function (api) {
         loose: true,
       },
     ],
+    ['@babel/plugin-proposal-private-property-in-object', { loose: true }],
+    ['@babel/plugin-proposal-private-methods', { loose: true }],
     [
       '@babel/plugin-proposal-object-rest-spread',
       {