start project

frontend/vitest.config.ts

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+import { fileURLToPath, URL } from 'node:url';
+
+import react from '@vitejs/plugin-react';
+import { defineConfig } from 'vite';
+
+/**
+ * Separate from vite.config.ts on purpose: the app's build config knows
+ * nothing about a test runner, and vitest's `test` block is not a valid Vite
+ * option, so mixing them makes `vite build` warn about an unknown key.
+ */
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    // Mirrors the "@/*" path mapping in tsconfig.json.
+    alias: { '@': fileURLToPath(new URL('./src', import.meta.url)) },
+  },
+  test: {
+    environment: 'jsdom',
+    setupFiles: ['./src/test/setup.ts'],
+    css: false,
+    // e2e/ holds Playwright specs (a different `test()` global), and
+    // contract/ hits the live stack over the network - neither belongs in
+    // the hermetic default run. See vitest.contract.config.ts for the latter.
+    exclude: ['node_modules/**', 'e2e/**', 'contract/**'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'text-summary'],
+      include: ['src/**/*.{ts,tsx}'],
+      exclude: ['src/main.tsx', 'src/vite-env.d.ts', 'src/**/*.d.ts'],
+    },
+  },
+});