chore: support eslint flat config

Author: solufa

.eslintignore

@@ -0,0 +1,26 @@
+import js from '@eslint/js';
+import gitignore from 'eslint-config-flat-gitignore';
+import prettierConfig from 'eslint-config-prettier';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  { files: ['**/*.ts'] },
+  gitignore(),
+  { ignores: ['samples'] },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    languageOptions: { globals: { ...globals.node, ...globals.es2020 } },
+    rules: {
+      eqeqeq: 'error',
+      'no-param-reassign': 'error',
+      'object-shorthand': ['error', 'always'],
+      'prefer-template': 'error',
+      '@typescript-eslint/consistent-type-imports': 'error',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-require-imports': 'off',
+    },
+  },
+  prettierConfig,
+);