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If you generate a new project with Rails 7, it’s included in the Gemfile by default. The import maps feature is available in Rails as a Ruby gem. Install Import Maps in Your Rails Project Of course, the service provides some more options for requests, but this knowledge is enough to understand how Rails cooperates with JSPM in the import maps library.
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You can either download the source files to the vendor directory or serve the code directly from the URL.įor example, to access the jQuery library, you can call URL in your browser, and you will receive the URL to the minified source code in the JSON response. Rails uses JSPM to serve JavaScript libraries in your application. Thanks to this tool, you can load any NPM package inside the browser without extra tooling, and it will be fully optimized. JSPM is a shortcut for JavaScript Package Management. However, before I show you what happens inside the library, I would like to introduce the JSPM tool.
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This article will show you how to install, serve, and uninstall JavaScript libraries with import maps and what happens under the hood during each phase. This way, you can better understand the journey from installing a JavaScript library in your project to serving its content to your users. However, it’s also worth discovering what is happening under the hood. It’s essential you know how import maps work to benefit from the newest version of Rails (but don’t worry, you can still use tools like Webpack instead). Instead of one big file, though, your application serves many small JavaScript files. With this new mechanism, you can still manage your JavaScript libraries with a specific version. Import maps is the new feature in Rails 7 that allows us to say goodbye to Node.js and tools like Webpack.