ci: remove node 6 support and add linting in travis

Author: mingchuno

.travis.yml

@@ -3,7 +3,6 @@ sudo: required
 language: node_js
 
 node_js:
-  - 6
   - 8
   - 10
   - 12
@@ -23,9 +22,9 @@ before_script:
   - docker ps -a
 
 script:
-  # - npm run lint
+  - yarn lint
   # turn off lint for the moment
-  - MONGODB_URL=mongodb://localhost/connect-mongo-test travis_retry npm test
+  - MONGODB_URL=mongodb://localhost/connect-mongo-test travis_retry yarn test
 
 after_success:
-  - npm install coveralls -g && npm run cover | coveralls
+  - npm install coveralls -g && yarn cover | coveralls

commitlint.config.js

@@ -0,0 +1 @@
+module.exports = { extends: ['@commitlint/config-conventional'] }

package.json

@@ -51,5 +51,17 @@
     "lint:fix": "eslint src test --fix",
     "cover": "nyc report --reporter=text-lcov",
     "test": "nyc mocha"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged",
+      "commit-msg": "commitlint -E HUSKY_GIT_PARAMS"
+    }
+  },
+  "lint-staged": {
+    "*.js": [
+      "eslint --fix",
+      "git add"
+    ]
   }
 }