eslint-staged

A simple way to run eslint on staged changes.

npm install --save-dev eslint-staged

Pairs great with husky. Install husky, and add a precommit script to your package.json:

{
  "scripts": {
    "precommit": "eslint-staged"
  }
}

This lets you make sure you always lint the changes you're actually committing, not just your working tree. Run it any time with npm run -s precommit.