Set up linting using eslint

Author: realityking

.eslintrc.js

@@ -0,0 +1,27 @@
+module.exports = {
+  extends: 'airbnb-base',
+  env: {
+    'browser': true,
+    'mocha': true,
+    'node': true
+  },
+  rules: {
+    'class-methods-use-this': 'off',
+    'comma-dangle': ['error', 'never'],
+    'consistent-return': 'off',
+    'func-names': 'off',
+    'import/no-extraneous-dependencies': 'off',
+    'import/no-unresolved': 'off',
+    'max-len': 'off',
+    'no-bitwise': 'off',
+    'no-continue': 'off',
+    'no-empty': 'off',
+    'no-multi-assign': 'off',
+    'no-new': 'off',
+    'no-param-reassign': 'off',
+    'no-plusplus': 'off',
+    'no-restricted-syntax': 'off',
+    'no-underscore-dangle': 'off',
+    'no-use-before-define': 'off'
+  }
+};

.travis.yml

@@ -3,6 +3,11 @@ node_js:
   - 6
   - 8
   - 'stable'
+
+script:
+  - npm run lint
+  - npm run test
+
 notifications:
   email:
     recipients:

package.json

@@ -7,6 +7,7 @@
     "node": ">= 6"
   },
   "scripts": {
+    "lint": "eslint src/ test/ bin/",
     "test": "scripts/test",
     "prepublish": "scripts/prepublish"
   },
@@ -20,6 +21,9 @@
   },
   "devDependencies": {
     "chai": "4.1.2",
+    "eslint": "4.19.0",
+    "eslint-config-airbnb-base": "12.1.0",
+    "eslint-plugin-import": "2.9.0",
     "mocha": "5.0.4"
   },
   "keywords": [