Add boolean filter to babel plugins

Author: charrondev

packages/react-scripts/config/webpack.config.js

@@ -421,7 +421,7 @@ module.exports = function(webpackEnv) {
                       },
                     },
                     isEnvDevelopment && require.resolve('react-refresh/babel'),
-                  ],
+                  ].filter(Boolean),
                 ],
                 // This is a feature of `babel-loader` for webpack (not Babel itself).
                 // It enables caching results in ./node_modules/.cache/babel-loader/