test: enable coverage

Author: AriPerkkio

.gitignore

@@ -1,5 +1,6 @@
 node_modules
 dist
+coverage
 .vite-source-map-visualizer
 .custom-report-directory
 .DS_store

package.json

@@ -13,7 +13,7 @@
   ],
   "scripts": {
     "build": "rm -rf ./dist && tsc --project tsconfig.build.json",
-    "test": "vitest",
+    "test": "vitest --coverage",
     "typecheck": "tsc --noEmit"
   },
   "packageManager": "pnpm@8.15.9",
@@ -22,6 +22,7 @@
   },
   "devDependencies": {
     "@types/node": "^22.4.1",
+    "@vitest/coverage-v8": "^2.0.5",
     "typescript": "^5.5.4",
     "vite": "^5.4.0",
     "vitest": "^2.0.5"