improve repo structure

local/config/src/vitest.js

@@ -0,0 +1,9 @@
+const { resolve } = require('path');
+const { defineConfig } = require('vitest/config');
+
+module.exports = defineConfig({
+  test: {
+    setupFiles: resolve(__dirname, 'vitest.setup.js'),
+    environment: 'jsdom',
+  },
+});

local/config/src/vitest.setup.js

@@ -0,0 +1,4 @@
+import matchers from '@testing-library/jest-dom/matchers';
+import { expect } from 'vitest';
+
+expect.extend(matchers);