code-formatter

name	code-formatter
description	Execute automatically formats and validates code files using Prettier and other formatting tools. Use when users mention "format my code", "fix formatting", "apply code style", "check formatting", "make code consistent", or "clean up code formatting". Handles JavaScript, TypeScript, JSON, CSS, Markdown, and many other file types. Trigger with relevant phrases based on skill purpose.
allowed-tools	Read, Write, Edit, Grep, Glob, Bash(cmd:*)
version	2.26.0
author	Jeremy Longshore <[e-mail]>
license	MIT
tags	["example","typescript","code-formatter"]
compatibility	Designed for Claude Code

Code Formatter

Overview

Formats and validates code files using Prettier and related formatting tools. Supports JavaScript, TypeScript, JSON, CSS, Markdown, and many other file types.

Prerequisites

• Node.js (v16+) and npm/npx installed
• Prettier available globally (npm install -g prettier) or locally in the project
• Write permissions for target files and configuration directories
• Supported file types present in the project (.js, .jsx, .ts, .tsx, .json, .css, .md)

Instructions

1. Check whether Prettier is available by running npx prettier --version. If missing, install it locally with npm install --save-dev prettier or globally with npm install -g prettier.
2. Detect existing configuration by searching for .prettierrc, .prettierrc.json, prettier.config.js, or a "prettier" key in package.json. If no configuration exists, create a .prettierrc with sensible defaults (see ${CLAUDE_SKILL_DIR}/references/implementation.md).
3. Run npx prettier --check "**/*.{js,jsx,ts,tsx,json,css,md}" --ignore-path .prettierignore to identify files that need formatting. Report the count and list of non-conforming files.
4. Apply formatting to identified files using npx prettier --write on the target paths. For single files, specify the exact path; for directories, use glob patterns.
5. Create or update .prettierignore to exclude generated outputs (dist/, build/, *.min.js, *.min.css), dependencies (node_modules/, vendor/), and lock files.
6. Optionally set up pre-commit enforcement by installing husky and lint-staged, then configuring lint-staged in package.json to run prettier --write on staged files matching supported extensions.
7. Run a final npx prettier --check to confirm all target files now conform to the configured style rules.