message: Export BoxProps interface
diff: @@ -4,7 +4,7 @@ import {COMMON, CommonProps, FLEX, FlexProps, LAYOUT, LayoutProps} from './const
  import sx, {SxProp} from './sx'
  import theme from './theme'
  -interface BoxProps extends CommonProps, FlexProps, LayoutProps, SxProp {}
  +export interface BoxProps extends CommonProps, FlexProps, LayoutProps, SxProp {}
  const Box = styled.div<BoxProps>`
  ${COMMON}
  