Blog/September 11, 2025

Yumma CSS 3.3

Introduction of the .mjs configuration format & improves configuration file generation.

Using MJS Configuration

Yumma CSS v3.3 transitions from .js to .mjs for configuration files, removing the need for type="module" in package.json & optimizing CLI module detection.

yumma.config.js
yumma.config.mjs

Configuration File Generation

This release fixes JSON syntax issues in the configuration file generation. The init command now generates valid configuration properties.

export default {
  source: [""],
  output: "",
  buildOptions: {
    reset: true,
    minify: false,
  },
};

Upgrade

Check the Upgrading Guide for a full list of utility renames & removals.

pnpm up yummacss@latest