import { createApp } from 'vue';
import VirTree from 'vue-virtual-tree';

createApp(App).use(VirTree).mount('#app');

In components:
<vir-tree />

<template>
  <div class="demo">
    <vir-tree" :source="list" />
  </div>
</template>

<script lang="tsx">
  import {defineComponent, onMounted, ref} from 'vue';
  import { VirTree, TreeNodeOptions } from 'vue-virtual-tree';

  export default defineComponent({
    name: 'BaseDemo',
    components: { VirTree },
    setup(props, {emit}) {
      const list = ref<TreeNodeOptions[]>([]);
      return {
        list
      }
    }
  });
</script>