feat: add example

examples/demo-frontend/vitest.config.mts

@@ -0,0 +1,14 @@
+import { fileURLToPath } from 'node:url'
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  resolve: {
+    alias: {
+      '@': fileURLToPath(new URL('./src', import.meta.url))
+    }
+  },
+  test: {
+    include: ['src/**/*.test.ts'],
+    environment: 'node'
+  }
+})