Webpack Configuration: custom setup for Webpack or rails/webpacker?

Version 9 of React on Rails added support for the rails/webpacker view helpers so that Webpack produced assets would no longer pass through the Rails asset pipeline. As part of this change, React on Rails added a configuration option to support customization of the node_modules directory. This allowed React on Rails to support the rails/webpacker configuration of the Webpack configuration.

A key decision in your use React on Rails is whether you go with the rails/webpacker default setup or the traditional React on Rails setup of putting all your client side files under the /client directory. While there are technically 2 independent choices involved, the directory structure and the mechanism of Webpack configuration, for simplicity sake we'll assume that these choices go together.

Until version 9, all React on Rails apps used the /client directory for configuring React on Rails in terms of the configuration of Webpack and location of your JavaScript and Webpack files, including the node_modules directory. Version 9 changed the default to / for the node_modules location using this value in config/initializers/react_on_rails.rb: config.node_modules_location. The

The ShakaCode Team recommends this approach for projects beyond the simplest cases as it provides the greatest transparency in your webpack and overall client-side setup. The big advantage to this is that almost everything within the /client directory will apply if you wish to convert your client-side code to a pure Single Page Application that runs without Rails. This allows you to google for how to do something with Webpack configuration and what applies to a non-Rails app will apply just as well to a React on Rails app.

The two best examples of this pattern are the react-webpack-rails-tutorial and the integration test example in spec/dummy.

In this case, you don't need to understand the nuances of customization of your Wepback config via the Webpacker mechanism.

Option 2: Default Generator Setup: rails/webpacker app/javascript

Typical rails/webpacker apps have a standard directory structure as documented here. If you follow the steps in the the basic tutorial, you will see this pattern in action. In order to customize the Webpack configuration, you need to consult with the rails/webpacker Webpack configuration.

The advantage of using rails/webpacker to configure Webpack is that there is very little code needed to get started and you don't need to understand really anything about Webpack customization. The big disadvantage to this is that you will need to learn the ins and outs of the rails/webpacker way to customize Webpack which differs from the plain Webpack way.

Overall, consider carefully if you prefer the rails/webpacker directory structure and Webpack configuration, over the placement of all client side files within the /client directory along with conventional Webpack configuration. Once again, the /client directory setup is recommended.

You can find more details on this topic in Recommended Project Structure.

See Issue 982: Tutorial Generating Correct Project Structure? to discuss this issue.

For more details on project setup, see Recommended Project Structure.

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