If you really need to customize Jest, you need to eject, you'll be provided with Jest config that CRA uses and you can extend. I've got it referencing my github fork in my package.json, deleted and How To resolve Syntax Error Support for the experimental syntax 'JSX isn't currently enabled Solution 1 To create a .babelrc file and 31 Webpack+BabelでReactの環境構築時に"Support for the experimental syntax 'jsx' isn't currently enabled"が出たときの解消メモ Hi man, absolutely amazing tutorial, my dev team ... - DEV Community Babel throwing Support for the experimental syntax 'jsx' isn't currently enabled. $ bin/rails g webpacker:install:react. javascript - Support for the experimental syntax 'jsx' isn't currently ... [Fixed] SyntaxError: Support for the experimental syntax 'jsx' isn't ... 1.3 Solution 3 : Add the command. I am trying to use webpack to create bundle.js file for my react-app but getting error:-Support for the experimental syntax 'classProperties' isn't currently enabled. For me that just meant replacing ts-loader with babel-loader, so that my config looks something like this now: plugin - React native project 2, Failed to compile, Error: 'Support for ... 123. SyntaxError: unknown: Support for the experimental syntax ... Syntax only. Yet overall, the RC version of React 18 feels stable enough to be used in PROD. rails6 Support for the experimental syntax 'jsx' isn't currently ...