0xdevalias/microbundle

Microbundle is a tool that helps JavaScript developers prepare their code libraries for sharing. When someone builds a reusable piece of code (like a utility function or a UI component), they need to package it so that other developers can easily import and use it in their own projects. Microbundle handles this packaging process automatically, without requiring the author to write complex configuration files. At its core, the tool takes a developer's source code and produces several different versions of it. These versions exist because JavaScript can run in different environments, like in a web browser, on a server using Node.js, or through various package managers, and each environment expects the code to be structured slightly differently. Microbundle outputs all the common formats at once. It also has a "modern" mode that keeps newer JavaScript features intact for recent browsers, resulting in smaller, faster code, while still producing compatible versions for older environments. This tool is aimed at developers who are publishing JavaScript packages to registries like npm. For example, if a developer has written a helpful date-formatting function or a custom button component and wants to share it with the world, they would use this tool to bundle everything up before publishing. It is particularly appealing to creators of small, focused libraries who want to avoid the overhead of setting up a complicated build pipeline. It also works out of the box with TypeScript and CSS, and includes a watch mode that automatically rebuilds the code as the developer makes changes. What makes the project notable is its philosophy of zero configuration. A developer only needs to add a few lines to their project's package file pointing to their source code, and the tool figures out the rest. It automatically compresses the code to make file sizes as small as possible and tracks the gzipped size. For developers who want more control, there are optional command-line flags for things like visualizing what makes up the final bundle or renaming internal code properties to shave off extra bytes, but these are entirely optional.