init

package.json

@@ -30,6 +30,7 @@
   "devDependencies": {
     "@babel/core": "^7.21.4",
     "@babel/eslint-parser": "^7.21.8",
+    "@babel/plugin-proposal-class-properties": "^7.18.6",
     "@babel/plugin-transform-runtime": "^7.21.4",
     "@babel/preset-env": "^7.21.5",
     "@cesium/engine": "^2.3.0",