Prettify your code in pre-commit

package.json

{
  "name": "prettierdemo",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    
  },
  "devDependencies": {
    "husky": "^0.14.3",
    "lint-staged": "^5.0.0",
    "prettier": "^1.8.2"
  },
  "scripts": {
    "precommit": "lint-staged"
  },
  "lint-staged": {
    "*.js": [
      "prettier --single-quote --tab-width 4 --write",
      "git add"
    ]
  }
}