message: Import SystemStyleObject
diff: declare module '@primer/components' {
  type Omit<T, K> = Pick<T, Exclude<keyof T, K>>
  import * as StyledSystem from 'styled-system'
  + import {SystemStyleObject} from '@styled-system/css'
  import {ReactComponentLike} from 'prop-types'
  import * as History from 'history'
  