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README.md

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# JavaScript Bundling for Rails
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Use [esbuild](https://esbuild.github.io), [rollup.js](https://rollupjs.org), or [Webpack](https://webpack.js.org) to bundle your JavaScript, then deliver it via the asset pipeline in Rails. This gem provides installers to get you going with the bundler of your choice in a new Rails application, and a convention to use `app/assets/bundles` to hold your bundled output as artifacts that are not checked into source control (the installer adds this directory to `.gitignore` by default).
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Use [esbuild](https://esbuild.github.io), [rollup.js](https://rollupjs.org), or [Webpack](https://webpack.js.org) to bundle your JavaScript, then deliver it via the asset pipeline in Rails. This gem provides installers to get you going with the bundler of your choice in a new Rails application, and a convention to use `app/assets/builds` to hold your bundled output as artifacts that are not checked into source control (the installer adds this directory to `.gitignore` by default).
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You develop using this approach by running the bundler in watch mode in a terminal with `yarn build --watch` (and your Rails server in another, if you're not using something like [puma-dev](https://github.com/puma/puma-dev)). Whenever the bundler detects changes to any of the JavaScript files in your project, it'll bundle `app/javascript/application.js` into `app/assets/bundles/javascript.js` (and all other entry points placed in the root of `app/javascript`). You can refer to the build output in your layout using the standard asset pipeline approach with `<%= javascript_include_tag "application" %>`.
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You develop using this approach by running the bundler in watch mode in a terminal with `yarn build --watch` (and your Rails server in another, if you're not using something like [puma-dev](https://github.com/puma/puma-dev)). Whenever the bundler detects changes to any of the JavaScript files in your project, it'll bundle `app/javascript/application.js` into `app/assets/builds/javascript.js` (and all other entry points configured). You can refer to the build output in your layout using the standard asset pipeline approach with `<%= javascript_include_tag "application", defer: true %>`.
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When you deploy your application to production, the bundler attaches to the `assets:precompile` task to ensure that all your package dependencies from `package.json` have been installed via npm, and then runs `yarn build` to process all the entry points, as it would in development. The latter files are then picked up by the asset pipeline, digested, and copied into public/assets, as any other asset pipeline file.
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When you deploy your application to production, the `javascript:build` task attaches to the `assets:precompile` task to ensure that all your package dependencies from `package.json` have been installed via yarn, and then runs `yarn build` to process all the entry points, as it would in development. The latter files are then picked up by the asset pipeline, digested, and copied into public/assets, as any other asset pipeline file.
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This also happens in testing where the bundler attaches to the `test:prepare` task to ensure the JavaScript has been bundled before testing commences. (Note that this currently only applies to rails `test:*` tasks (like `test:all` or `test:controllers`), not "rails test", as that doesn't load `test:prepare`).
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That's it!
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You can configure your bundler options in the `build` script in `package.json` or via the installer-generated rollup.config.js for rollup.js or webpack.config.json for Webpack (esbuild does not have a default configuration format).
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You can configure your bundler options in the `build` script in `package.json` or via the installer-generated `rollup.config.js` for rollup.js or `webpack.config.json` for Webpack (esbuild does not have a default configuration format).
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## Installation

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