Migrate to Vitest (#483)

* Migrate to Vitest

* `skipLibCheck` for now

package.json

@@ -4,27 +4,22 @@
   "main": "dist/index.js",
   "license": "MIT",
   "devDependencies": {
-    "@babel/core": "^7.13.10",
-    "@babel/preset-env": "^7.13.10",
-    "@babel/preset-typescript": "^7.13.0",
     "@changesets/changelog-github": "^0.4.2",
     "@changesets/cli": "^2.20.0",
     "@changesets/write": "^0.1.6",
     "@types/fs-extra": "^8.0.0",
-    "@types/jest": "^29.5.1",
     "@types/node": "^22.15.17",
     "@types/semver": "^7.5.0",
-    "babel-jest": "^29.5.0",
     "esbuild": "^0.25.4",
     "fixturez": "^1.1.0",
     "husky": "^3.0.3",
-    "jest": "^29.5.0",
     "prettier": "^2.0.5",
-    "typescript": "^5.8.3"
+    "typescript": "^5.8.3",
+    "vitest": "^3.1.3"
   },
   "scripts": {
     "build": "esbuild src/index.ts --bundle --platform=node --target=node20 --minify --outfile=dist/index.js",
-    "test": "jest",
+    "test": "vitest",
     "test:watch": "yarn test --watch",
     "typecheck": "tsc",
     "changeset": "changeset",