Try tweaking Babel to make this loose error stop

Author: markerikson

.babelrc.js

@@ -12,6 +12,7 @@ module.exports = {
         // Use the equivalent of `babel-preset-modules`
         bugfixes: true,
         modules: false,
+        loose: false,
       },
     ],
     '@babel/preset-typescript',
@@ -21,6 +22,7 @@ module.exports = {
     '@babel/transform-react-jsx',
     '@babel/plugin-proposal-class-properties',
     '@babel/plugin-proposal-private-methods',
+    '@babel/plugin-proposal-private-property-in-object',
     cjs && ['@babel/transform-modules-commonjs'],
     [
       '@babel/transform-runtime',