Resolve "Resolve peer dependency warnings"

Closes #150 (closed)

frontend/.eslintrc.js

 module.exports = {
   root: true,
   env: {
-    node: true
+    node: true,
   },
-  'extends': [
-    'plugin:vue/essential',
-    '@vue/standard',
-    '@vue/typescript'
+  extends: [
+    'plugin:vue/recommended',
+    '@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',
+    '@typescript-eslint/consistent-type-assertions': ['error', { assertionStyle: 'as' }]
   },
   parserOptions: {
-    parser: 'typescript-eslint-parser'
-  }
+    parser: '@typescript-eslint/parser',
+  },
+  plugins: ['@typescript-eslint'],
+  overrides: [
+    {
+      files: [
+        '**/__tests__/*.{j,t}s?(x)',
+      ],
+      env: {
+        mocha: true,
+      },
+    },
+  ],
 }