多次初始化(例如切换页面)时，Cesium类对象变化，导致使用外部依赖Cesium的库第二次无法正常判断instanceof

[lgl017]

如题，使用基于Cesium封装的库，因vue-cesium多次初始化返回的Cesium类不同，导致无法正常使用instanceof

map.vue:

<template>
  <div class="home viewer">
	<div @click="test">测试</div>
    <vc-viewer v-if="showCesium" ref="viewerRef" @ready="onViewerReady">
    </vc-viewer>
  </div>
</template>

<script lang="ts" setup>
import { ref } from 'vue'
import {
  VcViewerRef,
} from 'vue-cesium'
import { VcPickEvent, VcReadyObject } from 'vue-cesium/es/utils/types'
import type * as DemoType from "../lib/demo";

defineProps({
})
const viewerRef = ref<VcViewerRef>(null)

let DemoLib: typeof DemoType;
let showCesium = ref(true);

let count = 0;

const onViewerReady = async (readyObj: VcReadyObject) => {
	count++;
	console.log("onViewerReady", count);
	
	let realLib = await (() => import("../lib/demo"))();
	DemoLib = realLib;

	new DemoLib.Demo(readyObj.viewer);
}

function test () {
	showCesium.value = !showCesium.value;
}
</script>

demo.ts

// import { Viewer } from "cesium"; //实际使用
let Cesium = window.Cesium; //演示umd打包后

export class Demo {
	constructor(viewer: Cesium.Viewer) {
		console.log("instanceof: ", viewer instanceof Cesium.Viewer);
	}
}

[kkwwang]

removeCesiumScript false 试试