SyntaxError: /mnt/c/myAppFile/hello-rails-react/app/javascript/components/Greeting.js: Support for the experimental syntax 'jsx' isn't currently enabled rails

The error message you encountered is a SyntaxError in a Ruby file. It specifically states that support for the experimental syntax 'jsx' is not currently enabled in Rails. To resolve this issue, you need to enable support for JSX in your Rails application. Here are the steps to do so:

Step 1: Install the react-rails gem

To enable JSX support in Rails, you need to install the react-rails gem. This gem provides integration between Rails and React.js.

Step 2: Add the react-rails gem to your Gemfile

Open your Gemfile and add the following line:

gem 'react-rails'

Save the file and run the bundle install command to install the gem.

Step 3: Generate the necessary files

Run the following command to generate the necessary files for React integration:

rails generate react:install

This command will generate the necessary JavaScript files and directories for React integration.

Step 4: Enable JSX support

Open the config/webpacker.yml file and add the following line under the default section:

  source_path: app/javascript

Save the file.

Step 5: Restart your Rails server

After making these changes, restart your Rails server to apply the configuration changes.

Now, you should have JSX support enabled in your Rails application. You can use JSX syntax in your JavaScript files without encountering the 'jsx' experimental syntax error.

Please note that the steps provided are based on general knowledge of integrating React.js with Rails. It's always a good idea to consult the official documentation or relevant resources for more detailed instructions specific to your Rails version and setup.