[Bug Report] Module '"../node_ modules/element-ui/types"' has no exported member 'Scrollbar'

### Element UI version
2.15.0

### OS/Browsers version
谷歌浏览器

### Vue version
2.6.12

### Reproduction Link
https://elementui.github.io/issue-generator/#/en-US

### Steps to reproduce
https://element.eleme.io/#/zh-CN/component/quickstart

### What is Expected?
Module '"../node_modules/element-ui/types"' has no exported member 'Scrollbar',

### What is actually happening?
import { Scrollbar } from 'element-ui'
Module '"../node_modules/element-ui/types"' has no exported member 'Scrollbar'