chore: migrate to ESLint flat config (#1673)

* chore: migrate to ESLint flat config

* chore: run prettier

eslint.config.mjs

@@ -0,0 +1,59 @@
+import path from 'node:path';
+import {fileURLToPath} from 'node:url';
+
+import {includeIgnoreFile} from '@eslint/compat';
+import {FlatCompat} from '@eslint/eslintrc';
+import js from '@eslint/js';
+import reactPlugin from 'eslint-plugin-react';
+import globals from 'globals';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const gitignorePath = path.resolve(__dirname, '.gitignore');
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+export default [
+  {
+    name: 'React Plugin',
+    files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
+    ...reactPlugin.configs.flat.recommended,
+  },
+  ...compat.extends('@appium/eslint-config-appium-ts'),
+  {
+    name: 'JS/TS Files',
+    files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+        document: 'readonly',
+      },
+    },
+    settings: {
+      react: {
+        version: 'detect',
+      },
+    },
+    rules: {
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          varsIgnorePattern: 'React',
+        },
+      ],
+      'react/prop-types': 'off',
+    },
+  },
+  {
+    ignores: [
+      ...includeIgnoreFile(gitignorePath).ignores,
+      '**/.*', // dotfiles aren't ignored by default in FlatConfig
+      '**/*.xml',
+      '**/*.html',
+    ],
+  },
+];