![]() The webpack config used to invoke webpack, config/webpack/development.js merges settings from config/webpacker.yml and the config provided by the NPM package (3).Įxecuting webpack will generate assets in the public/packs/ directory along with the important manifest.json (4). To do so, the Rails server will run webpack in a child process if the compiled assets are missing or stale (2). ![]() Rails must be able to determine the URL for webpack JS, CSS, and image assets. Here's how webpack fits into the picture.Īs it processes an HTML request (1), Rails will render the View, including "pack" tags such as the following: This mode is enabled when the compile option is set to true in config/webpacker.yml. Webpacker supports two development "modes": bin/webpack and bin/webpack-dev-serverįor the purpose of illustration, we'll focus on how Webpacker works in development. javascript_pack_tag and stylesheet_link_tag i.e., config/webpacker.yml and config/webpack/.js.Webpacker provides the glue, which includes: Rails needs some "glue" to help it communicate with webpack. Therefore, webpack must run in a separate process. While the Rails asset pipeline lives within the Rails server process, webpack, as you may know, is written in JavaScript and executes within the Node.js runtime. This time, the request is processed by (1) the ActionDispatch::Static middleware, which recognizes the asset lives on disk in the public/assets/ directory (2). Much of the detail has been omitted for simplicity and to draw attention to the salient aspects.Īs the browser parses the HTML response and finds that script tag, it must make an additional request to fetch the linked JavaScript resource from your Rails server. Note: Please consider the diagrams in this post as approximations of how the pieces fit together. The asset pipeline is responsible for creating the bundled assets in the public/assets/ directory and providing URLs to those assets to be rendered in the View. With the asset pipeline, when an HTML request is processed (1), bundling takes place within your Rails server (2). ![]() Subscribe to my newsletter for occasional emails with new content. Let's see how things look when requests are served with the Rails asset pipeline in development. How webpack and Rails work together in boxes and arrowsĬonfused about how Webpacker works in Rails? Let's unpack it with some diagrams.įirst, we'll take a look at the "classic" way of bundling assets with Rails: the Rails asset pipeline. ![]()
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