eslint-staged

A simple way to run eslint on staged changes.

``
npm install --save-dev eslint-staged
`

Pairs great with (husky)[npm.im/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`.