feat: vitest

Author: ryoppippi

package.json

@@ -8,6 +8,7 @@
 	"license": "MIT",
 	"keywords": [],
 	"scripts": {
+		"test": "vitest",
 		"build": "mkdist -d",
 		"lint": "eslint --cache .",
 		"format": "nr lint --fix",
@@ -22,6 +23,7 @@
 		"lightningcss": "^1.25.1",
 		"mkdist": "^1.5.4",
 		"svelte": "5.0.0-next.210",
-		"typescript": "^5.5.4"
+		"typescript": "^5.5.4",
+		"vitest": "^2.0.5"
 	}
 }