add eslint

Author: Artur Charaev

.eslintrc

@@ -0,0 +1,20 @@
+{
+  "extends": "airbnb-base",
+  "parserOptions": {
+    "ecmaVersion": 6,
+  },
+  "rules": {
+    "no-lonely-if": 2,
+    "no-nested-ternary": 2,
+    "prefer-spread": 2,
+    "no-param-reassign": ["error", {"props": false}],
+    "no-unused-vars": ["error", { "args": "none" }],
+    "comma-dangle": ["error", {
+      "arrays": "always-multiline",
+      "objects": "always-multiline",
+      "imports": "always-multiline",
+      "exports": "always-multiline",
+      "functions": "never",
+    }],
+  }
+}

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "build": "babel src --out-dir lib",
     "clean": "rimraf lib",
-    "prepublish": "npm run clean && npm run build",
+    "lint": "eslint src",
+    "prepublish": "npm run lint && npm run clean && npm run build",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "keywords": [
@@ -26,6 +27,9 @@
     "babel-cli": "^6.18.0",
     "babel-plugin-transform-object-rest-spread": "^6.20.2",
     "babel-preset-es2015": "^6.18.0",
+    "eslint": "^3.13.1",
+    "eslint-config-airbnb-base": "^11.0.1",
+    "eslint-plugin-import": "^2.2.0",
     "rimraf": "^2.5.4"
   },
   "files": [