TASK: Add prettier for linting and formating

Use prettier together with eslint to format and lint the
code.

Author: Markus Günther

.eslintrc

@@ -1,17 +1,26 @@
 {
-  "extends": "eslint-config-rackt",
+  "extends": "prettier",
   "env": {
     "browser": true,
     "mocha": true,
     "node": true
   },
+  "parser": "babel-eslint",
+  "parserOptions": {
+      "ecmaVersion": 6,
+      "sourceType": "module",
+      "ecmaFeatures": {
+          "jsx": true,
+          "modules": true,
+          "experimentalObjectRestSpread": true
+      }
+  },
   "rules": {
+    "prettier/prettier": "warn",
     "valid-jsdoc": 2,
     "react/jsx-uses-vars": 1,
     "react/jsx-uses-react": 1,
     "react/jsx-no-undef": 2
   },
-  "plugins": [
-    "react"
-  ]
+  "plugins": ["prettier", "react"]
 }

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "trailingComma": "none",
+  "semi": false,
+  "singleQuote": true
+}

package.json

@@ -28,19 +28,20 @@
     "@types/react": "^16.4.7",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.3",
-    "babel-eslint": "^7.2.3",
+    "babel-eslint": "^8.2.6",
     "babel-plugin-transform-decorators-legacy": "^1.3.5",
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-react": "^6.24.1",
     "babel-preset-stage-0": "^6.24.1",
-    "eslint": "^3.19.0",
-    "eslint-config-rackt": "^1.1.1",
-    "eslint-plugin-babel": "^4.1.1",
+    "eslint": "^5.3.0",
+    "eslint-config-prettier": "^2.9.0",
+    "eslint-plugin-prettier": "^2.6.2",
     "eslint-plugin-react": "^7.10.0",
     "expect": "^1.18.0",
     "fbjs": "^0.8.17",
     "jsdom": "^9.8.3",
     "mocha": "^3.3.0",
+    "prettier": "^1.14.0",
     "prop-types": "^15.6.2",
     "react": "^16.4.2",
     "react-dom": "^16.4.2",
@@ -55,6 +56,7 @@
   "scripts": {
     "build": "babel src --out-dir lib",
     "lint": "eslint src test",
+    "lint-check": "eslint --print-config .eslintrc.js | eslint-config-prettier-check",
     "prepublish": "rimraf lib && npm run build",
     "test": "mocha --compilers js:babel-core/register --recursive --reporter spec --require ./test/setup.js",
     "test:watch": "npm test -- --watch"