Merge pull request #670 from hasparus/export-types

Export types from @theme-ui/core

Author: mxstbr

packages/core/src/index.ts

@@ -9,6 +9,8 @@ import deepmerge from 'deepmerge'
 import { version as __EMOTION_VERSION__ } from '@emotion/core/package.json'
 import { Theme } from './theme'
 
+export * from './theme'
+
 const getCSS = props => {
   if (!props.sx && !props.css) return undefined
   return theme => {