Add JS build process

package.json

@@ -3,9 +3,13 @@
   "version": "0.1.0",
   "description": "Wordpress theme for windycoys.com",
   "scripts": {
-    "css": "run-s css:*",
+    "build": "run-p css:compile js:compile",
+    "css": "run-p css:*",
     "css:compile": "postcss -o theme/style.css css/index.css",
     "css:lint": "stylelint --config .stylelintrc \"css/**/*.css\"",
+    "js": "run-p js:*",
+    "js:compile": "rollup --config rollup.config.js",
+    "js:lint": "eslint js/",
     "serve": "browser-sync start --config .browser-sync.js",
     "start": "run-p watch serve",
     "watch": "npm-watch"
@@ -14,6 +18,9 @@
   "license": "MIT",
   "devDependencies": {
     "browser-sync": "^2.23.6",
+    "eslint": "^4.17.0",
+    "eslint-config-airbnb-base": "^12.1.0",
+    "eslint-plugin-import": "^2.8.0",
     "npm-run-all": "^4.1.2",
     "npm-watch": "^0.3.0",
     "stylelint": "^8.4.0",
@@ -21,13 +28,19 @@
     "stylelint-selector-bem-pattern": "^2.0.0"
   },
   "dependencies": {
+    "@babel/cli": "^7.0.0-beta.39",
+    "@babel/core": "^7.0.0-beta.39",
+    "@babel/preset-env": "^7.0.0-beta.39",
     "autoprefixer": "^7.2.5",
     "cssnano": "^3.10.0",
     "normalize.css": "^7.0.0",
     "postcss-cli": "^4.1.1",
     "postcss-custom-media": "^6.0.0",
     "postcss-custom-properties": "^6.2.0",
-    "postcss-import": "^11.0.0"
+    "postcss-import": "^11.0.0",
+    "rollup": "^0.55.5",
+    "rollup-plugin-babel": "^4.0.0-beta.1",
+    "rollup-plugin-uglify": "^3.0.0"
   },
   "watch": {
     "css": {
@@ -35,6 +48,12 @@
         "css"
       ],
       "extensions": "css"
+    },
+    "js": {
+      "patterns": [
+        "js"
+      ],
+      "extensions": "js"
     }
   }
 }