问TypeError:无法读取null属性(读取'isCE') -自定义组件库

EN

- paragraph.js

{
  "name": "paragraph",
  "private": true,
  "version": "0.0.0",
  "description": "The paragraph test component.",
  "main": "./dist/paragraph.umd.js",
  "module": "./dist/paragraph.es.js",
  "exports": {
    ".": {
      "import": "./dist/paragraph.es.js",
      "require": "./dist/paragraph.umd.js"
    },
    "./dist/style.css": "./dist/style.css"
  },
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "preview": "vite preview"
  },
  "dependencies": {
    "vue": "^3.2.25"
  },
  "devDependencies": {
    "@vitejs/plugin-vue": "^2.3.1",
    "vite": "^2.9.5"
  }
}

import { fileURLToPath, URL } from 'url'
import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

// https://vitejs.dev/config/
export default defineConfig({
  build: {
    lib: {
      entry: fileURLToPath(new URL('./src/paragraph.js', import.meta.url)),
      name: 'Paragraph',
      fileName: (format) => `paragraph.${format}.js`,
    },
    rollupOptions: {
      external: ['vue'],
      output: {
        globals: {
          vue: 'Vue'
        },
      },
    },
  },
  plugins: [vue()],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url))
    },
  },
})

import Paragraph from './components/Paragraph.vue';

export default {
  install: (app) => {
    app.component('Paragraph', Paragraph);
  },
};

<script setup>
  console.log('Test');
</script>

<template>
  <p class="paragraph">
    <slot />
  </p>
</template>

<style>
  .paragraph
  {
      color: black;
  }
</style>

import { createApp } from 'vue'
import App from './App.vue'
import Paragraph from '../../paragraph/dist/paragraph.es.js'

createApp(App).use(Paragraph).mount('#app')

<Paragraph>Hello World 2!</Paragraph>

TypeError: Cannot read properties of null (reading 'isCE')