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less-pro

Write and maintain Less stylesheets: variables, mixins, guards, imports, and build integration. Use when working with Less-based projects (e.g., Ant Design theming).

skills/less-pro/SKILL.md

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# Less Pro

A practical guide to Less: variables, mixins (parametric + guarded), operations, namespaced imports, and build integration — primarily for maintaining Less-based codebases and theming component libraries built on Less.

## Overview

Less is a CSS preprocessor in the Sass/Stylus family, notable for its JavaScript-based implementation and its role as the styling layer of major UI libraries (notably Ant Design, which themes via Less variables). New projects rarely choose Less today, but large existing codebases run on it — this skill is about working effectively in those codebases and customizing Less-based design systems.

## When to use

- Theming Ant Design or other Less-based component libraries (`@primary-color` overrides).
- Maintaining existing Less stylesheets.
- Build integration: `less-loader`, standalone `lessc`, or in-browser `less.js` (dev only).
- Deciding whether to migrate Less → modern CSS/Sass.