chore(eslint): migrate to flat config

Author: sukvvon

.eslintignore

@@ -0,0 +1,68 @@
+import { builtinModules } from 'module';
+import prettierRecommended from 'eslint-plugin-prettier/recommended';
+import simpleImportSort from 'eslint-plugin-simple-import-sort';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  {
+    ignores: ['**/node_modules/', '**/dist/'],
+  },
+  tseslint.configs.recommended,
+  {
+    plugins: {
+      'simple-import-sort': simpleImportSort,
+    },
+    rules: {
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-inferrable-types': 'off',
+      '@typescript-eslint/ban-types': 'off',
+      '@typescript-eslint/no-redeclare': 'off',
+      '@typescript-eslint/no-empty-object-type': 'off',
+      '@typescript-eslint/no-non-null-assertion': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-empty-interface': 'off',
+      '@typescript-eslint/no-unsafe-declaration-merging': 'off',
+      '@typescript-eslint/explicit-member-accessibility': ['warn', { accessibility: 'no-public' }],
+      '@typescript-eslint/no-unused-vars': ['warn', { varsIgnorePattern: '^_', argsIgnorePattern: '^_' }],
+      'simple-import-sort/exports': 'warn',
+      'simple-import-sort/imports': [
+        'warn',
+        {
+          groups: [
+            // Side effect imports.
+            ['^\\u0000'],
+            [
+              // Node.js builtins.
+              `^node:`,
+              `^(${builtinModules.join('|')})(/|$)`,
+              // Packages.
+              '^@?\\w',
+              // Internal packages.
+              '^(src)(/.*|$)',
+              // Parent imports. Put `..` last.
+              '^\\.\\.(?!/?$)',
+              '^\\.\\./?$',
+              // Other relative imports. Put same-folder imports and `.` last.
+              '^\\./(?=.*/)(?!/?$)',
+              '^\\.(?!/?$)',
+              '^\\./?$',
+            ],
+          ],
+        },
+      ],
+    },
+  },
+  {
+    files: ['*.js', '*.cjs', '*.cts'],
+    rules: {
+      '@typescript-eslint/no-var-requires': 'off',
+    },
+  },
+  {
+    files: ['*.test.ts'],
+    rules: {
+      '@typescript-eslint/ban-ts-comment': 'off',
+    },
+  },
+  prettierRecommended,
+);