Add ESLint to dev builds and CI

.eslintrc.js

@@ -1,5 +1,6 @@
 module.exports = {
   root: true,
+  parser: 'babel-eslint',
   parserOptions: {
     ecmaVersion: 2017,
     sourceType: 'module',

.travis.yml

@@ -14,6 +14,7 @@ install:
 cache:
   yarn: true
 script:
+  - yarn lint
   - yarn test -- --single-run
 before_deploy:
   - environment=production yarn build

demo/stripes.js

@@ -48,6 +48,12 @@ commander
     if (options.cache) config.plugins.push(cachePlugin);
     if (options.devtool) config.devtool = options.devtool;
 
+    // Show eslint failures at runtime
+    config.module.rules.push({
+      test: /src\/.*\.js$/,
+      loader: 'eslint-loader'
+    });
+
     const compiler = webpack(mirage(svgloader(config)));
 
     const port = options.port || process.env.STRIPES_PORT || 3000;

package.json

@@ -9,11 +9,13 @@
     "postinstall": "bin/link-self",
     "start": "node demo/stripes.js dev demo/stripes.config.js",
     "build": "node demo/stripes.js build demo/stripes.config.js dist",
-    "test": "karma start"
+    "test": "karma start",
+    "lint": "eslint src"
   },
   "devDependencies": {
     "@folio/stripes-core": "thefrontside/stripes-core#master",
     "babel-core": "^6.25.0",
+    "babel-eslint": "^7.2.3",
     "babel-loader": "^7.1.1",
     "babel-preset-env": "^1.6.0",
     "babel-preset-react": "^6.24.1",