![]() ![]() To make sure your ES modules are immediately usable by tools that work with CommonJS such as Node.js and webpack, you can use Rollup to compile to UMD or CommonJS format, and then point to that compiled version with the main property in your package.json file. Rollup can import existing CommonJS modules through a plugin. ![]() Since this approach can utilise explicit import and export statements, it is more effective than simply running an automated minifier to detect unused variables in the compiled output code. then (handleResponse) īecause Rollup includes the bare minimum, it results in lighter, faster, and less complicated libraries and applications. Js // import the ajax function with an ES6 import statement import ` ). This allows you to build on top of existing tools and modules without adding extra dependencies or bloating the size of your project.įor example, with CommonJS, the entire tool or library must be imported. In addition to enabling the use of ES modules, Rollup also statically analyzes the code you are importing, and will exclude anything that isn't actually used. This means that you get to write future-proof code, and you also get the tremendous benefits of… Tree-Shaking Rollup allows you to write your code using the new module system, and will then compile it back down to existing supported formats such as CommonJS modules, AMD modules, and IIFE-style scripts. The specification is now fixed, but it is only implemented in modern browsers and not finalised in Node.js. This finally changed with the ES6 revision of JavaScript, which includes a syntax for importing and exporting functions and data so they can be shared between separate scripts. ![]() Unfortunately, JavaScript has not historically included this capability as a core feature in the language. Shell # UMD format requires a bundle name rollup main.js -file bundle.js -format umd -name " myBundle " The Why ĭeveloping software is usually easier if you break your project into smaller separate pieces, since that often removes unexpected interactions and dramatically reduces the complexity of the problems you'll need to solve, and simply writing smaller projects in the first place isn't necessarily the answer. ![]()
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