Setup lint-staged

Author: hudochenkov

package.json

@@ -31,15 +31,21 @@
   "devDependencies": {
     "eslint": "~4.6.1",
     "eslint-config-hudochenkov": "~2.0.0",
-    "jest": "^21.1.0"
+    "husky": "^0.14.3",
+    "jest": "^21.1.0",
+    "lint-staged": "^4.1.3"
   },
   "scripts": {
-    "test": "jest && npm run lint",
+    "precommit": "lint-staged",
+    "test": "npm run lint && jest",
     "jest": "jest",
     "watch": "jest --watch",
     "coverage": "jest --coverage",
     "lint": "eslint *.js 'lib/**/*.js'"
   },
+  "lint-staged": {
+    "*.js": ["npm run lint -- --fix", "git add"]
+  },
   "jest": {
     "setupFiles": [
       "./jest-setup.js"