chore: configure vitest with project-based setup and coverage

packages/shared/tsconfig.json

@@ -3,7 +3,8 @@
   "compilerOptions": {
     "module": "NodeNext",
     "moduleResolution": "NodeNext",
-    "outDir": "./dist"
+    "outDir": "./dist",
+    "types": ["vitest/globals"],
   },
-  "include": ["src"]
+  "include": ["src"],
 }

packages/shared/vitest.config.ts

@@ -0,0 +1,3 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({ test: { environment: "node", globals: true } });