style(js): Add standardjs linter (#223)

The lack of a linter, coupled with tests not covering all branches of the JS, allowed #217 to
happen. This adds linting to the CI job, and if the relevant editor plugins are installed shows lint
errors inside the editor.

Closes #217.

Author: bengourley

.travis.yml

@@ -4,7 +4,7 @@ jobs:
       sudo: false
       language: javascript
       install: npm install
-      script: npm run test:unit:js && npm run test:smoke:typescript
+      script: npm run test:lint:js && npm run test:unit:js && npm run test:smoke:typescript
     - stage: build android
       language: android
       sudo: false
@@ -32,7 +32,7 @@ jobs:
         - cd android
         - ./gradlew assembleRelease
       licenses:
-        - 
+        -
     - stage: build cocoa
       language: objective-c
       osx-image: xcode7.3
@@ -46,4 +46,4 @@ jobs:
         - npm install
         - ./node_modules/.bin/react-native link
         - cd ios
-        - xcodebuild -project BugsnagReactNativeExample.xcodeproj -scheme BugsnagReactNativeExample build CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO -quiet
+        - xcodebuild -project BugsnagReactNativeExample.xcodeproj -scheme BugsnagReactNativeExample build CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO -quiet

index.js

@@ -1,2 +1,2 @@
 'use strict'
-module.exports = require('./lib/Bugsnag');
+module.exports = require('./lib/Bugsnag')

package.json

@@ -15,6 +15,7 @@
   "scripts": {
     "prepublish": "mkdir -p lib && babel src/Bugsnag.js -s -o lib/Bugsnag.js",
     "test:unit:js": "jest --coverage src/__tests__",
+    "test:lint:js": "standard",
     "test:smoke:typescript": "tslint index.d.ts && tsc --strict test/app.ts"
   },
   "peerDependencies": {
@@ -32,11 +33,22 @@
       "packageImportPath": "import com.bugsnag.BugsnagReactNative;"
     }
   },
+  "standard": {
+    "parser": "babel-eslint",
+    "ignore": [
+      "lib",
+      "test",
+      "test-harness",
+      "examples"
+    ]
+  },
   "devDependencies": {
     "babel-cli": "^6.24.1",
+    "babel-eslint": "^8.2.2",
     "babel-jest": "^21.0.2",
     "babel-preset-react-native": "^1.9.1",
     "jest": "^21.1.0",
+    "standard": "^11.0.0",
     "tslint": "^5.8.0",
     "typescript": "^2.6.1"
   }