added difficulty

.eslintrc.js

@@ -1,83 +1,39 @@
 module.exports = {
     env: {
-        'commonjs': true,
-        'es2021': true,
+        commonjs: true,
+        es2021: true,
+        browser: true,
     },
-    extends: [
-        'eslint:recommended',
-    ],
+    globals: {
+        Vue: 'readonly',
+    },
+    extends: [ 'eslint:recommended' ],
     parserOptions: {
         ecmaVersion: 12,
     },
     rules: {
-        'indent': [
-            'error',
-            4,
-        ],
-        'linebreak-style': [
-            'error',
-            'unix',
-        ],
-        'quotes': [
-            'error',
-            'single',
-        ],
-        'semi': [
-            'error',
-            'always',
-        ],
-        'curly': [
-            'error',
-            'all',
-        ],
-        'brace-style': [
-            'error',
-            '1tbs',
-        ],
+        'indent': [ 'error', 4 ],
+        'linebreak-style': [ 'error', 'unix' ],
+        'quotes': [ 'error', 'single' ],
+        'semi': [ 'error', 'always' ],
+        'curly': [ 'error', 'all' ],
+        'brace-style': [ 'error', '1tbs' ],
         'jest/no-done-callback': 'off',
         'jest/expect-expect': 'off',
-        'comma-dangle': [
-            'error',
-            'always-multiline',
-        ],
+        'comma-dangle': [ 'error', 'always-multiline' ],
         'complexity': 'error',
         'consistent-return': 'error',
-        'dot-location': [
-            'error',
-            'property',
-        ],
-        'eqeqeq': [
-            'error',
-            'always',
-            { null: 'ignore' },
-        ],
+        'dot-location': [ 'error', 'property' ],
+        'eqeqeq': [ 'error', 'always', { null: 'ignore' } ],
         'no-empty-function': 'error',
         'no-floating-decimal': 'error',
         'no-multi-spaces': 'error',
-        'camelcase': [
-            'error',
-            { properties: 'never' },
-        ],
-        'comma-spacing': [
-            'error',
-            { before: false, after: true },
-        ],
-        'array-bracket-newline': [
-            'error',
-            { multiline: true },
-        ],
-        'array-element-newline': [
-            'error',
-            { multiline: true, minItems: 2 },
-        ],
-        'array-bracket-spacing': [
-            'error',
-            'always',
-        ],
-        'object-curly-spacing': [
-            'error',
-            'always',
-        ],
+        'camelcase': [ 'error', { properties: 'never' } ],
+        'comma-spacing': [ 'error', { before: false, after: true } ],
+        'array-bracket-newline': [ 'error', { multiline: true } ],
+        'array-element-newline': [ 'error', { multiline: true, minItems: 6 } ],
+        'array-bracket-spacing': [ 'error', 'always' ],
+        'object-curly-spacing': [ 'error', 'always' ],
         'comma-style': 'error',
         'computed-property-spacing': 'error',
         'eol-last': 'error',
@@ -92,11 +48,8 @@ module.exports = {
         'no-unneeded-ternary': 'error',
         'no-whitespace-before-property': 'error',
         'operator-assignment': 'error',
-        'quote-props': [
-            'error',
-            'consistent-as-needed',
-        ],
+        'quote-props': [ 'error', 'consistent-as-needed' ],
         'space-before-blocks': 'error',
         'space-infix-ops': 'error',
     },
-};
+};