Enable a lot of eslint options and plugins

Taken rules from Cockpit, which have been proven to be effective for
finding bugs and keeping clean code, and sensible (not taking
unreasonable effort to satisfy).

Fix code layout in app.jsx accordingly.

Closes #39

.eslintrc.json

@@ -3,7 +3,8 @@
         "browser": true,
         "es6": true
     },
-    "extends": "eslint:recommended",
+    "extends": ["eslint:recommended", "standard", "standard-react"],
+    "parser": "babel-eslint",
     "parserOptions": {
         "ecmaFeatures": {
             "experimentalObjectRestSpread": true,
@@ -11,11 +12,38 @@
         },
         "sourceType": "module"
     },
-    "plugins": ["react"],
+    "plugins": ["flowtype", "react"],
     "rules": {
-        "react/jsx-uses-vars": "error",
+        "indent": ["error", 4,
+            {
+                "ObjectExpression": "first",
+                "CallExpression": {"arguments": "first"},
+                "MemberExpression": 2,
+                "ignoredNodes": [ "JSXAttribute" ]
+            }],
+        "newline-per-chained-call": ["error", { "ignoreChainWithDepth": 2 }],
+        "lines-between-class-members": ["error", "always", { "exceptAfterSingleLine": true }],
+        "prefer-promise-reject-errors": ["error", { "allowEmptyReject": true }],
+        "react/jsx-indent": ["error", 4],
+        "semi": ["error", "always", { "omitLastInOneLineBlock": true }],
+
+        "camelcase": "off",
+        "comma-dangle": "off",
+        "curly": "off",
+        "jsx-quotes": "off",
+        "key-spacing": "off",
         "no-console": "off",
-        "no-undef": "error"
+        "quotes": "off",
+        "react/jsx-curly-spacing": "off",
+        "react/jsx-indent-props": "off",
+        "react/prop-types": "off",
+        "space-before-function-paren": "off",
+        "standard/no-callback-literal": "off",
+
+        "eqeqeq": "off",
+        "import/no-webpack-loader-syntax": "off",
+        "object-property-newline": "off",
+        "react/jsx-no-bind": "off"
     },
     "globals": {
         "require": false,

package.json

@@ -11,6 +11,7 @@
   },
   "devDependencies": {
     "babel-core": "^6.25.0",
+    "babel-eslint": "^9.0.0",
     "babel-loader": "^7.0.0",
     "babel-plugin-transform-react-jsx": "^6.24.1",
     "babel-preset-env": "^1.5.2",
@@ -18,9 +19,16 @@
     "compression-webpack-plugin": "~1.0.0",
     "copy-webpack-plugin": "~3.0.1",
     "css-loader": "^0.28.11",
-    "eslint": "^3.0.0",
+    "eslint": "^5.4.0",
+    "eslint-config-standard": "^11.0.0",
+    "eslint-config-standard-react": "^6.0.0",
     "eslint-loader": "~1.6.1",
-    "eslint-plugin-react": "~6.9.0",
+    "eslint-plugin-flowtype": "^2.50.0",
+    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-node": "^7.0.1",
+    "eslint-plugin-promise": "^4.0.0",
+    "eslint-plugin-react": "^6.9.0",
+    "eslint-plugin-standard": "^3.1.0",
     "extract-text-webpack-plugin": "^2.1.0",
     "htmlparser": "^1.7.7",
     "jed": "^1.1.1",

src/app.jsx

@@ -27,9 +27,10 @@ export class Application extends React.Component {
     constructor() {
         super();
 
-        cockpit.file('/etc/hostname').read().done((content) => {
-            this.setState({ 'hostname': content.trim() });
-        });
+        cockpit.file('/etc/hostname').read()
+                .done((content) => {
+                    this.setState({ 'hostname': content.trim() });
+                });
     }
 
     render() {