Features

• 💨 Dependency-free
• 🤏 Small: 48kB (142x+ lighter than lint-staged).
• ☯️ Support multiple file states like staged, unstaged, last-commit, changed etc
• 💪 Multi configuration (useful for monorepos)

Benchmarks

Benchmarks running time for 10 file:

$ node bench/running-time/index.js
- lint-staged 0.439 ms
+ nano-staged 0.257 ms

The space in node_modules including sub-dependencies:

$ node bench/size/index.js
Data from packagephobia.com
- lint-staged   6707 kB
+ nano-staged     48 kB

The performance results were generated on a MBP Late 2013, 2.3 GHz Intel Core i7 by running npm run bench in the library folder. See bench/running-time/index.js

Usage

Getting Started

1. Install nano-staged:

   npm install --save-dev nano-staged

   or

   yarn add nano-staged -D

2. Add the nano-staged section and the commands to your package.json:

   For example:

   "nano-staged": {
      "*.{js,ts}": "prettier --write",
      "*.css": ["stylelint", "eslint --fix"]
   },

3. Run commands with Nano Staged:

   ./node_modules/.bin/nano-staged

   Nano Staged by default to run commands from the config for staged files.

Pre-commit Hook

You can use Nano Staged with a pre-commit tools to run it automatically before every commit.

1. Install simple-git-hooks as a dev dependency:

   npm install simple-git-hooks --save-dev

2. Add the simple-git-hooks section to your package.json and fill in the pre-commit:

   For example:

   "simple-git-hooks": {
      "pre-commit": "./node_modules/.bin/nano-staged"
   }

3. Run the CLI script to update the git hooks with the commands from the config:

   npx simple-git-hooks

4. To automatically have Git hooks enabled after install, edit package.json:

   "scripts": {
      "postinstall": "npx simple-git-hooks"
   }

1. Install husky as a dev dependency:

   npm install husky --save-dev

2. Enable Git hooks:

   npx husky install

3. Add a command to a hook:

   npx husky add .husky/pre-commit "./node_modules/.bin/nano-staged"

4. To automatically have Git hooks enabled after install, edit package.json:

   "scripts": {
      "postinstall": "npx husky install"
   }

Configuration

Nano Staged supports multiple ways to define config.

1. nano-staged section in package.json:

   "nano-staged": {
      "*": "your-cmd",
      "*.ext": ["your-cmd", "your-cmd"]
   }

2. or a separate .nano-staged.json, nano-staged.json or .nanostagedrc config file:

   {
     "*": "your-cmd",
     "*.ext": ["your-cmd", "your-cmd"]
   }

3. or a more flexible .nano-staged.cjs or nano-staged.cjs config file to CommonJS modules:

   module.exports = {
     '*': 'your-cmd',
     '*.ext': ['your-cmd', 'your-cmd'],
   }

4. or a more flexible .nano-staged.mjs or nano-staged.mjs config file to ECMAScript modules:

   export default {
     '*': 'your-cmd',
     '*.ext': ['your-cmd', 'your-cmd'],
   }

5. or a more flexible .nano-staged.js or nano-staged.js config file:

   // package.json => "type": "module"
   export default {
     '*': 'your-cmd',
     '*.ext': ['your-cmd', 'your-cmd'],
   }
   
   // package.json => "type": "commonjs"
   module.exports = {
     '*': 'your-cmd',
     '*.ext': ['your-cmd', 'your-cmd'],
   }

Format priorities:

If there are multiple configuration files in the same directory, Nano Staged will only use one. The priority order is as follows:

1. .nano-staged.js
2. nano-staged.js
3. .nano-staged.cjs
4. nano-staged.cjs
5. .nano-staged.mjs
6. nano-staged.mjs
7. .nano-staged.json
8. nano-staged.json
9. .nanostagedrc
10. package.json

Config Function API:

JS config files may export export either a single function or an object:

export default (api) => {
  const jsFiles = api.filenames.filter((file) => path.extname(file) === '.js')

  return [`eslint --fix ${jsFiles.join(' ')}`, `prettier --write ${jsFiles.join(' ')}`]
}

export default {
  '*.js': (api) => `eslint --fix ${api.filenames.join(' ')}`,
}

The api object exposes:

api.filenames - working filenames

api.type - run type: staged, unstaged, diff

Command Line Interface

--config [<path>] or -c [<path>]

Path to file that contains your configuration object. The path should be either absolute or relative to the directory that your process is running from.

--unstaged or -u

Run commands from the config only for git unstaged files. Nano Staged by default uses only staged git files.

--diff [<ref1> <ref2>]

Run commands on files changed between the working tree and the index or a tree, on files changed between the index and a tree, files changed between two trees, or on files changed between two indexes (commit hashes).

--allow-empty

Will allow creating an empty commit.

Thanks

Special thanks to lint-staged. Some codes was borrowed from it.

Community

The Nano Staged community can be found on GitHub Discussions, where you can ask questions, voice ideas, and share your projects.