setup-pre-commit

Set Up Pre-Commit Hook

What This Sets Up

Husky pre-commit hook
lint-staged Run Prettier on all staged files
Prettier config (if missing)
The 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 exists. Default to npm if unclear.

2. Install Dependencies

Install as devDependencies:

husky lint-staged prettier

3. Initialize Husky

npx husky init

This creates the .husky/ directory and adds prepare: "husky"。

4. Create `.husky/pre-commit`

Write this file (Husky v9+ does not need a shebang):

npx lint-staged
npm run typecheck
npm run test

Adapt: Replace npm with the detected package manager. If the repository does not have typecheck or test scripts in package.json, omit these lines and tell the user.

5. Create `.lintstagedrc`

{
  "*": "prettier --ignore-unknown --write"
}

6. Create `.prettierrc`(if missing)

Only create if a Prettier config does not already exist. Use these defaults:

{
  "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
The 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 the message:Add pre-commit hooks (husky + lint-staged + prettier)

This will run through the new pre-commit hook — a good smoke test to make sure everything works.

Notes

Husky v9+ does not need shebangs in hook files
prettier --ignore-unknown skips files Prettier cannot parse (images, etc.)
The pre-commit first runs lint-staged (fast, staged only), then runs the full type check and tests