11/24/2023 0 Comments Browse bundle filesThe file is an ES module which exports a default object that sets Rollup.js options. The default name is and it should be placed in the root of your project (typically, the directory where you run rollup from). Rollup.js can use a JavaScript configuration file to define bundling options. The examples above are already long and you’ve not begun to add plugins! build/bundle.js -format iife -watch -no-watch.clearScreenĬommand-line flags can quickly become unwieldy. The terminal screen is cleared on every run, but you can disable this with -no-watch.clearScreen: npx rollup. The -watch (or -w) flag monitors your source files for changes and automatically builds the bundle. You’ll see the original src code and line numbers. Open your developer tools and navigate to the Sources tab in Chrome-based browsers or the Debugger tab in Firefox. build/bundle.js: //# sourceMappingURL=data:application/json charset=utf-8 base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiY.etc.Īfter generating the source map, you can load an example page which references the script. Rather than producing an additional file, a base64-encoded version of the source map is appended to. build/bundle.js: //# sourceMappingURL=bundle.js.mapĪlternatively, you can create an inline source map with -sourcemap inline. You can view it, although it’s mostly gibberish and not intended for human consumption! The map is referenced as a comment at the end of. This makes it easier to set breakpoints or locate problems when errors occur.Īn external source map can be created by adding a -sourcemap flag to the rollup command: npx rollup. Output a Source MapĪ source map provides a reference back to the source files so they can be examined in browser developer tools. es6 will produce a slightly smaller bundle, but be wary of global variables and functions which could conflict with other libraries. Unless you’re using a specific module system, iife will be the best option for client-side JavaScript. Universal Module Definition for use on both the client and server For example: "scripts" : ()) block so it cannot conflict with other libraries Alternatively, rollup commands can be added to the package.json "scripts" section. You won’t be able to run the rollup command directly, but npx rollup can be used. Presuming you have an existing Node.js package.json file within a project folder, run: npm install rollup -save-dev However, if you’re on a larger team creating a Node.js project, it can be preferable to install Rollup.js locally to ensure all developers are using the same version. This permits the rollup command to be run in any project directory containing JavaScript files - such as a PHP, WordPress, Python, Ruby or other project. Rollup.js requires Node.js v8.0.0 or above and can be installed globally with: npm install rollup -global This tutorial explains how to use typical configurations within your own projects. It has a daunting number of options, but it’s easy to get started and bundling is fast. Rollup.js primarily concentrates on JavaScript (although there are plugins for HTML templates and CSS). This works well when you’re happy with the default settings, but custom configurations can be difficult and processing is slower. Other bundler options, such as webpack, Snowpack, and Parcel, attempt to magically handle everything: HTML templating, image optimization, CSS processing, JavaScript bundling, and more. production bundles can be minified and have logging removed.multiple output files can be generated - for example, your library could be provided in ES5, ES6 modules, and Node.js-compatible CommonJS. ![]() ![]() transpiling to ES5 for backward compatibility is possible.the source can be linted, prettified, and syntax-checked during bundling.development is easier to manage when using smaller, self-contained source files.It compiles multiple source files into a single bundle. Rollup.js is a next-generation JavaScript module bundler from Rich Harris, the author of Svelte.
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