Bug report 🐞

在使用Vue3+vuecli 按需引入或单独引入时，发现缺少文件导致组件抖动，引入全部样式文件可解决抖动

Version & Environment

{ "name": "test", "version": "0.1.0", "private": true, "scripts": { "serve": "vue-cli-service serve", "build": "vue-cli-service build", "lint": "vue-cli-service lint" }, "dependencies": { "@varlet/ui": "^1.27.17", "core-js": "^3.6.5", "vue": "^3.0.0" }, "devDependencies": { "@vue/cli-plugin-babel": "~4.5.15", "@vue/cli-plugin-eslint": "~4.5.15", "@vue/cli-service": "~4.5.15", "@vue/compiler-sfc": "^3.0.0", "@vue/eslint-config-prettier": "^6.0.0", "babel-eslint": "^10.1.0", "eslint": "^6.7.2", "eslint-plugin-prettier": "^3.3.1", "eslint-plugin-vue": "^7.0.0", "less": "^3.0.4", "less-loader": "^5.0.0", "prettier": "^2.2.1", "unplugin-vue-components": "^0.21.1" } }

Expectation

Actual results (or Errors)

import { createApp } from 'vue' import App from './App.vue' import { DatePicker } from '@varlet/ui' import '@varlet/ui/es/date-picker/style/index' createApp(App).use(DatePicker).mount('#app')

点击左右切换月份按钮会抖动。