Adding basic ESLint config

.eslintignore

@@ -0,0 +1 @@
+public/bundle.js

.eslintrc.yml

@@ -0,0 +1,38 @@
+env:
+  browser: true
+  es6: true
+  jquery: true
+  node: true
+
+extends:
+  - eslint:recommended
+  - plugin:node/recommended
+
+plugins:
+  - node
+  - security
+
+root: true
+
+rules:
+  security/detect-buffer-noassert: warn
+  security/detect-child-process: warn
+  security/detect-disable-mustache-escape: warn
+  security/detect-eval-with-expression: warn
+  security/detect-new-buffer: warn
+  security/detect-no-csrf-before-method-override: warn
+  security/detect-non-literal-fs-filename: warn
+  security/detect-non-literal-regexp: warn
+  security/detect-non-literal-require: warn
+  security/detect-possible-timing-attacks: warn
+  security/detect-pseudoRandomBytes: warn
+  security/detect-unsafe-regex: warn
+
+  eqeqeq: error
+  no-console: warn
+  no-path-concat: error
+  no-unused-vars: [error, {argsIgnorePattern: "^_|next"}]
+  no-var: error
+  one-var: [error, never]
+  prefer-const: error
+  quotes: [error, single]

package.json

@@ -23,14 +23,21 @@
     "browserify": "^14.4.0",
     "buffer-shims": "^1.0.0",
     "cross-env": "^5.0.0",
-    "prettier": "^1.3.1",
+    "eslint": "3.19.0",
+    "eslint-plugin-node": "5.0.0",
+    "eslint-plugin-security": "1.3.0",
+    "prettier": "1.4.4",
     "watchify": "^3.9.0"
   },
+  "engines": {
+    "node": ">=8.0.0"
+  },
   "license": "MPL-2.0",
   "repository": "mozilla/something-awesome",
   "scripts": {
-    "format": "prettier --single-quote --write 'frontend/src/*.js' 'server/*.js'",
     "dev": "watchify frontend/src/main.js -o public/bundle.js -d | node server/portal_server.js",
+    "format": "prettier 'frontend/src/*.js' 'server/*.js' 'public/*.css' --single-quote --write",
+    "lint": "eslint .",
     "start": "watchify frontend/src/main.js -o public/bundle.js -d | cross-env NODE_ENV=production node server/portal_server.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   }