test: add initial testing and linting (#18)

eslint.config.mjs

@@ -0,0 +1,51 @@
+import { FlatCompat } from '@eslint/eslintrc';
+import importPlugin from 'eslint-plugin-import';
+import eslint from '@eslint/js';
+import eslintConfigPrettier from 'eslint-config-prettier';
+import tseslint from 'typescript-eslint';
+
+const compat = new FlatCompat({
+  baseDirectory: import.meta.__dirname,
+  resolvePluginsRelativeTo: import.meta.__dirname,
+});
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.strict,
+  ...tseslint.configs.stylistic,
+  eslintConfigPrettier,
+  {
+    files: ['**/*.{ts,tsxx}'],
+    extends: [importPlugin.flatConfigs.recommended, importPlugin.flatConfigs.typescript],
+    rules: {
+      'import/no-unresolved': 'off',
+      'import/extensions': ['error', 'ignorePackages'],
+      'import/exports-last': 'error',
+      'import/no-default-export': 'error',
+      'import/order': [
+        'error',
+        {
+          groups: ['builtin', 'external', 'internal', 'parent', 'sibling', 'index'],
+          'newlines-between': 'always',
+        },
+      ],
+      'import/no-duplicates': 'error',
+    },
+  },
+  {
+    rules: {
+      '@typescript-eslint/consistent-type-definitions': ['error', 'type'],
+    },
+  },
+  {
+    files: ['**.d.ts'],
+    rules: {
+      '@typescript-eslint/triple-slash-reference': 'off',
+      '@typescript-eslint/consistent-type-definitions': 'off',
+    },
+  },
+  ...compat.extends('plugin:prettier/recommended'),
+  {
+    ignores: ['**/node_modules/', '**/dist/', '**/.turbo/', '**/generated/'],
+  },
+);