feat: first step

vitest.config.ts

@@ -0,0 +1,36 @@
+import swc from 'unplugin-swc';
+import tsconfigPaths from 'vite-tsconfig-paths';
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  cacheDir: '.vitest',
+  test: {
+    setupFiles: ['tests/init-test.ts'],
+    environment: 'happy-dom',
+    include: ['tests/**/*.spec.ts'],
+    globals: true,
+    restoreMocks: true,
+    coverage: {
+      // you can include other reporters, but 'json-summary' is required, json is recommended
+      reporter: ['text', 'json-summary', 'json'],
+      // If you want a coverage reports even if your tests are failing, include the reportOnFailure option
+      reportOnFailure: true,
+      exclude: [
+        'vitest.config.ts',
+        'rslib.config.ts',
+        'scripts/**',
+        'examples/**',
+        'dist/**',
+      ],
+    },
+  },
+  plugins: [
+    tsconfigPaths(),
+    swc.vite({
+      include: /\.[mc]?[jt]sx?$/,
+      // for git+ package only
+      exclude: [] as any,
+      tsconfigFile: './tsconfig.spec.json',
+    }),
+  ],
+});