added eslint prettier check to travis (#5701)

- "yarn eslint" will throw the error if there are any formatting issues
- "yarn format" will format the js file based on the project's
prettier configuration.

browser/package.json

@@ -7,7 +7,8 @@
     "dev": "NODE_ENV=dev webpack-dev-server --devtool cheap-module-eval-source-map --progress --colors --hot --content-base dev",
     "build": "NODE_ENV=dev node build.js",
     "release": "NODE_ENV=production MINIO_UI_BUILD=RELEASE node build.js",
-    "format": "esformatter -i 'app/**/*.js'"
+    "format": "prettier --write 'app/**/*.js'",
+    "eslint": "eslint 'app/**/*.js'"
   },
   "jest": {
     "setupTestFrameworkScriptFile": "./app/js/jest/setup.js",
@@ -31,6 +32,7 @@
     "async": "^1.5.2",
     "babel-cli": "^6.14.0",
     "babel-core": "^6.14.0",
+    "babel-eslint": "^8.2.2",
     "babel-jest": "^22.1.0",
     "babel-loader": "^7.1.2",
     "babel-plugin-syntax-object-rest-spread": "^6.13.0",
@@ -43,15 +45,15 @@
     "css-loader": "^0.23.1",
     "enzyme": "^3.3.0",
     "enzyme-adapter-react-16": "^1.1.1",
-    "esformatter": "^0.10.0",
-    "esformatter-jsx": "^7.4.1",
-    "esformatter-jsx-ignore": "^1.0.6",
+    "eslint": "^4.19.1",
+    "eslint-plugin-prettier": "^2.6.0",
     "html-webpack-plugin": "^2.30.1",
     "jest": "^22.1.4",
     "jest-enzyme": "^4.0.2",
     "json-loader": "^0.5.4",
     "less": "^2.7.1",
     "less-loader": "^2.2.3",
+    "prettier": "^1.11.1",
     "purifycss-webpack-plugin": "^2.0.3",
     "style-loader": "^0.13.1",
     "url-loader": "^0.5.7",