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postcss-config-builder skill

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This skill generates a ready-to-use PostCSS configuration with Tailwind and autoprefixer, speeding CSS processing and project setup.

npx playbooks add skill ehtbanton/claudeskillsrepo --skill postcss-config-builder

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SKILL.md

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---
name: postcss-config-builder
description: Generate PostCSS configuration files with plugins for CSS processing, autoprefixing, and optimizations. Triggers on "create postcss config", "generate postcss configuration", "postcss setup", "css processing config".
---

# PostCSS Config Builder

Generate PostCSS configuration files with appropriate plugins for CSS processing.

## Output Requirements

**File Output:** `postcss.config.js` or `postcss.config.cjs`
**Format:** Valid PostCSS configuration
**Standards:** PostCSS 8.x

## When Invoked

Immediately generate a complete PostCSS configuration with plugins for the project needs.

## Configuration Template

```javascript
module.exports = {
  plugins: {
    tailwindcss: {},
    autoprefixer: {},
  },
};
```

## Example Invocations

**Prompt:** "Create postcss config for Tailwind with autoprefixer"
**Output:** Complete `postcss.config.js` with Tailwind and autoprefixer.

Overview

This skill generates a ready-to-use PostCSS configuration file tailored to your project needs. It produces valid PostCSS 8.x configs (postcss.config.js or postcss.config.cjs) with commonly used plugins like Tailwind, autoprefixer, cssnano, and other optimizers. The output is immediately usable and follows conventional module.exports format. Use the trigger phrases to create or update a PostCSS setup quickly.

How this skill works

Given a short prompt describing the desired CSS toolchain, the skill selects and composes appropriate PostCSS plugins and writes a complete configuration file. It validates plugin compatibility with PostCSS 8.x and formats the result as module.exports with a plugins object. The generator can include conditional comments or variations (CJS vs. JS) based on your project's module system.

When to use it

Initializing a new project that uses Tailwind CSS and needs autoprefixing
Adding CSS optimizations (minification, preset-env) before production builds
Migrating an older PostCSS setup to PostCSS 8.x compatible config
Creating a minimal config for modern CSS features with postcss-preset-env
Generating a config for tools that require postcss.config.js (e.g., webpack, Vite)

Best practices

Choose postcss.config.cjs for CommonJS projects; use postcss.config.js if your toolchain supports ESM
Include autoprefixer for broader browser compatibility, and postcss-preset-env to polyfill future CSS features
Use cssnano or cssnano-preset-advanced only for production builds and keep it off during development
Keep plugin order intentional: transform plugins (preset-env) before optimization plugins (cssnano)
Document any custom plugin options in comments so future maintainers know why they were chosen

Example use cases

Create postcss.config.js for Tailwind + autoprefixer when scaffolding a frontend project
Generate a production config with cssnano and autoprefixer to reduce CSS bundle size
Produce a config using postcss-preset-env to enable nesting, custom media queries, and stage features
Migrate an older config by outputting a PostCSS 8.x compatible plugins object
Provide a minimal config for component libraries that only need autoprefixer

FAQ

Which filename should I use, postcss.config.js or .cjs?

Use .cjs for CommonJS environments and tools that load config via require. Use .js if your build system supports ESM and you prefer that style.

Does the generated config include production-only optimizers?

Yes — the generator can include cssnano or similar optimizers and annotate them as production-only so you can wrap them in NODE_ENV checks.