![]() ![]() If you want to change these directories, you can adjust the source_path (default app/javascript) and source_entry_path (default packs) in the config/webpacker.yml file. Typically, the pack file itself is largely a manifest that uses import or require to load the necessary files and may also do some initialization. The default pack created for you by Webpacker will link to Rails' default JavaScript packages if they have been included in the project: Typically, the file in the actual packs directory will be a manifest that mostly loads other files, but it can also have arbitrary JavaScript code. ![]() With that in place, in development, Rails will recompile the application.js file every time it changes, and you load a page that uses that pack. So if you have a file called app/javascript/packs/application.js, Webpacker will create a pack called application, and you can add it to your Rails application with the code. With Webpacker installed, any JavaScript file in the app/javascript/packs directory will get compiled to its own pack file by default. 3 Usage 3.1 Using Webpacker for JavaScript The installation also calls the yarn package manager, creates a package.json file with a basic set of packages listed, and uses Yarn to install these dependencies. Installing Webpacker creates the following local files: FileĬonfiguration for the Babel JavaScript CompilerĬonfiguration for the PostCSS CSS Post-Processorīrowserlist manages target browsers configuration To add Webpacker to an existing project, add the webpacker gem to the project's Gemfile, run bundle install, and then run bin/rails webpacker:install. To include Webpacker in a new project, add -webpack to the rails new command. Yarn is a command-line utility that enables the installation and management of JavaScript dependencies, much like Bundler does for Ruby. NPM, the Node package manager registry, is the primary repository for publishing and downloading open-source JavaScript projects, both for Node.js and browser runtimes. To use Webpacker, you must install the Yarn package manager, version 1.x or up, and you must have Node.js installed, version 10.13.0 and up. Please note that each tool has a slightly different structure, and the concepts don't directly map onto each other. If you are familiar with Sprockets, the following guide might give you some idea of how to translate. You should choose Sprockets over Webpacker for legacy applications where migration might be costly, if you want to integrate using Gems, or if you have a very small amount of code to package. You should choose Webpacker over Sprockets on a new project if you want to use NPM packages and/or want access to the most current JavaScript features and tools. New Rails apps are configured to use webpack for JavaScript and Sprockets for CSS, although you can do CSS in webpack. However, webpack is better at integrating with more current JavaScript tools and NPM packages and allows for a wider range of integration. In particular, code can be added to Sprockets via a Ruby gem. Sprockets, which was designed to be used with Rails, is somewhat simpler to integrate. In a development environment, Sprockets and Webpacker allow you to incrementally change files. Both tools will compile your JavaScript into browser-friendly files and also minify and fingerprint them in production. Rails also ships with Sprockets, an asset-packaging tool whose features overlap with Webpacker. 1.2 How is Webpacker Different from Sprockets? See the webpack documentation for information. Webpack will allow you to write your code, reference other code in your application, transform your code, and combine your code into easily downloadable packs. With webpack, you can manage JavaScript, CSS, and static assets like images or fonts. The goal of webpack, or any front-end build system, is to allow you to write your front-end code in a way that is convenient for developers and then package that code in a way that is convenient for browsers. Webpacker is a Rails wrapper around the webpack build system that provides a standard webpack configuration and reasonable defaults. ![]()
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