13. Git Hooks

Hooks are scripts Git runs automatically at certain events. Located in .git/hooks/.

Most useful hooks

Hook	Runs when	Common use
pre-commit	Before commit is created	Lint, format, run tests
commit-msg	After writing commit message	Validate conventional commits format
pre-push	Before git push	Run full test suite
post-merge	After git pull/merge	Run npm install if package.json changed

Example: pre-commit lint check

# .git/hooks/pre-commit  (chmod +x this file)
#!/bin/sh
echo "Running linter..."
npm run lint
if [ $? -ne 0 ]; then
  echo "Lint failed. Commit aborted."
  exit 1
fi

Sharing hooks with the team

.git/hooks/ is not committed. To share hooks:

# Option 1: store in repo, configure path
git config core.hooksPath .githooks

# Option 2: use a tool like Husky (JS projects)
npm install husky --save-dev
npx husky init

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