fix: In Latest version of Vite, OutDir is already relative to root in Vite

demo/package.json

@@ -9,7 +9,7 @@
   },
   "devDependencies": {
     "cesium": "^1.85.0",
-    "vite": "^2.5.6",
+    "vite": "^2.7.1",
     "vite-plugin-cesium": "^1.2.10"
   }
 }

demo/vite.config.js

@@ -1,5 +1,5 @@
 import { defineConfig } from 'vite';
-import cesium from 'vite-plugin-cesium';
+import cesium from '../src/index.ts';
 export default defineConfig({
   plugins: [cesium()]
 });