Import * as React in @theme-ui/core

See facebook/react#18102

Author: hasparus

packages/core/src/index.ts

@@ -3,9 +3,8 @@ import {
   ThemeContext as EmotionContext,
   InterpolationWithTheme,
 } from '@emotion/core'
-// @ts-ignore
 import { css, Theme } from '@theme-ui/css'
-import React from 'react'
+import * as React from 'react'
 import deepmerge from 'deepmerge'
 import { version as __EMOTION_VERSION__ } from '@emotion/core/package.json'