Fix: HMR not working when updating app/components/{component_name}.html.erb in Rails 7

 If Hot Module Replacement (HMR) is not working as expected when updating `.html.erb` files in a Rails 7 application, it might be related to how Webpacker is configured. Here are steps to troubleshoot and fix this issue:


1. **Check Webpacker Configuration**:


   Verify that your Webpacker configuration is set up correctly, and that it's watching for changes in your `.html.erb` files. Make sure you have the following configurations in your `config/webpacker.yml`:


   ```yaml

   # config/webpacker.yml

   hot: true

   extensions:

     - .erb

   ```


   The `hot` option enables HMR, and the `extensions` array includes `.erb` files.


2. **Check Development Server**:


   Ensure that you are running your development server using the `webpack-dev-server`. This is typically done using the `bin/webpack-dev-server` command. The development server should be responsible for handling HMR. Make sure you are not just using the Rails server (e.g., `rails server`) for development.


3. **HTML Layout File**: 


   Ensure that your `.html.erb` files are included in your layout or views properly. Any changes in these files should trigger a refresh. For example, if your layout includes a partial or view file, it should be updated automatically when the partial is changed.


4. **Asset Compilation**: 


   Make sure that you are not precompiling assets in development (unless it's necessary for your project). Run the development server without precompilation:


   ```bash

   DISABLE_SPRING=1 rails s

   ```


5. **Browser Console**: 


   Check your browser console for any error messages related to HMR. It might provide insights into why HMR is failing.


6. **Rails 7 and Stimulus 3**:


   If you're using Rails 7 with Stimulus 3, be aware that Stimulus 3 introduced changes to how it works with Webpacker. You might need to update your Stimulus controllers and code to work with the new version.


7. **Webpacker Version**: 


   Ensure that you are using a compatible version of Webpacker with Rails 7. Check for any known issues or updates related to Webpacker that might address HMR problems.


8. **Caching**: 


   Clear your browser cache, as it can sometimes interfere with HMR.


9. **Consult Documentation and GitHub Issues**: 


   Check the official Rails, Webpacker, and Stimulus documentation for any known issues, and look for discussions or bug reports related to HMR in Rails 7.


10. **Community and Forums**: 


    Consider seeking help on the Ruby on Rails community forums or other relevant discussion platforms where Rails developers share their experiences.


If you continue to face issues, please provide more specific details about your project setup, such as your Webpacker configuration and how your `.html.erb` files are structured. This additional information can help in diagnosing the problem more accurately.

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