Add lint job to CI

.circleci/config.yml

@@ -27,13 +27,27 @@ jobs:
           key: dependency-cache-{{ checksum "package.json" }}
       - run:
           name: Test
-          command: npm test
+          command: npm run test
+
+  lint:
+    docker:
+      - image: circleci/node:4.8.2
+    steps:
+      - checkout
+      - restore_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+      - run:
+          name: Test
+          command: npm run lint
 
 workflows:
   version: 2
-  build_and_test:
+  build_test_lint:
     jobs:
       - build
       - test:
           requires:
             - build
+      - lint:
+          requires:
+            - build

package.json

@@ -8,7 +8,8 @@
   },
   "scripts": {
     "test": "istanbul cover _mocha -- -R spec --recursive test",
-    "prepublish": "gulp"
+    "prepublish": "gulp",
+    "lint": "prettier --list-different 'lib/**' 'test/**' gulpfile.js"
   },
   "repository": {
     "type": "git",