test: update eslint config to flat on eslint v8 (#836)

* chore(deps): update eslint plugins

update to
@stylistic/eslint-plugin-js@1.8.0
eslint-plugin-cypress@3.1.1

* chore(deps): add @eslint/eslintrc@3.0.2

* test: migrate to eslint flat config

eslint.config.mjs

@@ -0,0 +1,32 @@
+import globals from 'globals'
+import { FlatCompat } from '@eslint/eslintrc'
+import pluginJs from '@eslint/js'
+import eslintPluginJsonc from 'eslint-plugin-jsonc'
+import stylisticJs from '@stylistic/eslint-plugin-js'
+import mochaPlugin from 'eslint-plugin-mocha'
+
+const compat = new FlatCompat()
+
+export default [
+  pluginJs.configs.recommended,
+  ...eslintPluginJsonc.configs['flat/recommended-with-json'],
+  mochaPlugin.configs.flat.recommended,
+  {
+    plugins: {
+      '@stylistic/js': stylisticJs,
+    },
+    rules: {
+      '@stylistic/js/indent': ['error', 2, { 'SwitchCase': 1, 'MemberExpression': 'off' }],
+      'mocha/no-exclusive-tests': 'error',
+      'mocha/no-skipped-tests': 'error',
+      'mocha/no-mocha-arrows': 'off'
+    },
+    languageOptions: {
+      globals: {
+        ...globals.node
+      },
+    }
+  }, ...compat.config({
+    extends: ['plugin:cypress/recommended'],
+  })
+]

package.json

@@ -61,10 +61,11 @@
   },
   "devDependencies": {
     "@bahmutov/print-env": "1.3.0",
-    "@stylistic/eslint-plugin-js": "1.7.2",
+    "@eslint/eslintrc": "3.0.2",
+    "@stylistic/eslint-plugin-js": "1.8.0",
     "cypress": "13.8.1",
     "eslint": "8.57.0",
-    "eslint-plugin-cypress": "3.0.2",
+    "eslint-plugin-cypress": "3.1.1",
     "eslint-plugin-jsonc": "2.15.1",
     "eslint-plugin-mocha": "10.4.3",
     "globby": "11.1.0",