Git Hooks Automation

Native Git Hooks (No Framework)

# Create a pre-commit hook manually
cat > .git/hooks/pre-commit << 'EOF'
#!/bin/sh
set -e

# Run linter on staged files only
STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(js|ts|jsx|tsx)$' || true)

if [ -n "$STAGED_FILES" ]; then
  echo "🔍 Linting staged files..."
  echo "$STAGED_FILES" | xargs npx eslint --fix
  echo "$STAGED_FILES" | xargs git add  # Re-stage after fixes
fi
EOF
chmod +x .git/hooks/pre-commit

Problem: .git/hooks/ is local-only and not shared with the team. Use a framework instead.

Husky + lint-staged (Node.js Projects)

The modern standard for JavaScript/TypeScript projects. Husky manages Git hooks; lint-staged runs commands only on staged files for speed.

Quick Setup (Husky v9+)

# Install
npm install --save-dev husky lint-staged

# Initialize Husky (creates .husky/ directory)
npx husky init

# The init command creates a pre-commit hook — edit it:
echo "npx lint-staged" > .husky/pre-commit

Configure lint-staged in package.json

{
  "lint-staged": {
    "*.{js,jsx,ts,tsx}": [
      "eslint --fix --max-warnings=0",
      "prettier --write"
    ],
    "*.{css,scss}": [
      "prettier --write",
      "stylelint --fix"
    ],
    "*.{json,md,yml,yaml}": [
      "prettier --write"
    ]
  }
}

Add Commit Message Linting

# Install commitlint
npm install --save-dev @commitlint/cli @commitlint/config-conventional

# Create commitlint config
cat > commitlint.config.js << 'EOF'
module.exports = {
  extends: ['@commitlint/config-conventional'],
  rules: {
    'type-enum': [2, 'always', [
      'feat', 'fix', 'docs', 'style', 'refactor',
      'perf', 'test', 'build', 'ci', 'chore', 'revert'
    ]],
    'subject-max-length': [2, 'always', 72],
    'body-max-line-length': [2, 'always', 100]
  }
};
EOF

# Add commit-msg hook
echo "npx --no -- commitlint --edit \$1" > .husky/commit-msg

Add Pre-Push Hook

# Run tests before pushing
echo "npm test" > .husky/pre-push

Complete Husky Directory Structure

project/
├── .husky/
│   ├── pre-commit        # npx lint-staged
│   ├── commit-msg        # npx --no -- commitlint --edit $1
│   └── pre-push          # npm test
├── commitlint.config.js
├── package.json          # lint-staged config here
└── ...

pre-commit Framework (Python / Polyglot)

Language-agnostic framework that works with any project. Hooks are defined in YAML and run in isolated environments.

Setup

# Install (Python required)
pip install pre-commit

# Create config
cat > .pre-commit-config.yaml << 'EOF'