configured eslint, updated dependencies

frontend/.eslintrc.js

 module.exports = {
   root: true,
   env: {
-    node: true
+    node: true,
   },
-  'extends': [
+  extends: [
     'plugin:vue/essential',
-    '@vue/standard',
-    '@vue/typescript'
+    '@vue/typescript',
   ],
   rules: {
     'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
-    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off'
+    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
+    'semi': ['error', 'never'],
+    'quotes': ['error', 'single'],
+    'eqeqeq': 'error',
+    'default-case': 'error',
+    'guard-for-in': 'error',
+    'yoda': 'error'
   },
   parserOptions: {
-    parser: 'typescript-eslint-parser'
-  }
+    parser: '@typescript-eslint/parser',
+  },
+  plugins: ['@typescript-eslint'],
+  overrides: [
+    {
+      files: [
+        '**/__tests__/*.{j,t}s?(x)',
+      ],
+      env: {
+        mocha: true,
+      },
+    },
+  ],
 }

frontend/package.json

@@ -35,19 +35,22 @@
     "@types/mocha": "^5.2.5",
     "@types/nightwatch": "^0.9.8",
     "@types/sinon": "^7.0.2",
-    "@vue/cli-plugin-eslint": "^3.0.0-rc.10",
-    "@vue/cli-plugin-typescript": "^3.2.0",
-    "@vue/cli-plugin-unit-mocha": "^3.2.0",
-    "@vue/cli-service": "^3.2.0",
-    "@vue/eslint-config-standard": "^3.0.0-rc.10",
-    "@vue/eslint-config-typescript": "^3.2.0",
-    "@vue/test-utils": "^1.0.0-beta.27",
+    "@vue/cli-plugin-eslint": "^3.11.0",
+    "@vue/cli-plugin-typescript": "^3.11.0",
+    "@vue/cli-plugin-unit-mocha": "^3.11.0",
+    "@vue/cli-service": "^3.11.0",
+    "@vue/test-utils": "^1.0.0-beta.29",
+    "@vue/eslint-config-typescript": "^4.0.0",
+    "@typescript-eslint/parser": "^2.3.2",
+    "@typescript-eslint/eslint-plugin": "^2.3.2",
     "chai": "^4.2.0",
     "mocha": "^5.2.0",
-    "mocha-webpack": "^1.1.0",
     "mock-local-storage": "^1.1.8",
     "sinon": "^7.2.2",
-    "typescript": "^3.2.2",
-    "vue-template-compiler": "^2.5.16"
+    "eslint": "^5.16.0",
+    "eslint-plugin-vue": "^5.0.0",
+    "typescript": "^3.4.3",
+    "vue-template-compiler": "^2.5.16",
+    "webpack": "^4.41.0"
   }
 }

frontend/src/components/AutoLogout.vue

@@ -72,7 +72,7 @@ export default class AutoLogout extends Vue {
 
   mounted () {
     // show notification on unload if logged in
-    window.onbeforeunload = event => {
+    window.onbeforeunload = (event: BeforeUnloadEvent) => {
       if (Authentication.isLoggedIn) {
         // return something to trigger the confirmation dialog
         // since firefox 44 it is no longer possible to show a custom confirmation message