Prettier on commit configuration

package.json

{
  "name": "project",
  "version": "0.0.0",
  "scripts": {
    "format": "prettier --tab-width 4 --print-width 120 --write 'source/**/*.js'",
    "precommit": "lint-staged",
    "test": "echo \"nothing yet\"",
    "test:format": "prettier-check --tab-width 4 --print-width 120 'source/**/*.js'"
  },
  "lint-staged": {
    "source/**/*.js": [
      "prettier --tab-width 4 --print-width 120 --write",
      "git add"
    ]
  },
  "author": "Person",
  "license": "UNLICENSED",
  "devDependencies": {
    "husky": "^0.14.3",
    "lint-staged": "^4.1.0",
    "prettier": "^1.6.1",
    "prettier-check": "^1.0.0"
  }
}