description:Set up Husky pre-commit hooks with lint-staged (Prettier), type checking, and tests in the current repo. Use when user wants to add pre-commit hooks, set up Husky, configure lint-staged, or add commit-time formatting/typechecking/testing.
---
# Setup Pre-Commit Hooks
## What This Sets Up
- **Husky** pre-commit hook
- **lint-staged** running Prettier on all staged files
- **Prettier** config (if missing)
- **typecheck** and **test** scripts in the pre-commit hook
## Steps
### 1. Detect package manager
Check for `package-lock.json` (npm), `pnpm-lock.yaml` (pnpm), `yarn.lock` (yarn), `bun.lockb` (bun). Use whichever is present. Default to npm if unclear.
### 2. Install dependencies
Install as devDependencies:
```
husky lint-staged prettier
```
### 3. Initialize Husky
```bash
npx husky init
```
This creates `.husky/` dir and adds `prepare: "husky"` to package.json.
### 4. Create `.husky/pre-commit`
Write this file (no shebang needed for Husky v9+):
```
npx lint-staged
npm run typecheck
npm run test
```
**Adapt**: Replace `npm` with detected package manager. If repo has no `typecheck` or `test` script in package.json, omit those lines and tell the user.
### 5. Create `.lintstagedrc`
```json
{
"*":"prettier --ignore-unknown --write"
}
```
### 6. Create `.prettierrc` (if missing)
Only create if no Prettier config exists. Use these defaults:
```json
{
"useTabs":false,
"tabWidth":2,
"printWidth":80,
"singleQuote":false,
"trailingComma":"es5",
"semi":true,
"arrowParens":"always"
}
```
### 7. Verify
- [ ]`.husky/pre-commit` exists and is executable
- [ ]`.lintstagedrc` exists
- [ ]`prepare` script in package.json is `"husky"`
- [ ]`prettier` config exists
- [ ] Run `npx lint-staged` to verify it works
### 8. Commit
Stage all changed/created files and commit with message: `Add pre-commit hooks (husky + lint-staged + prettier)`
