message: CommonProps should extend interfaces from StyledSystem.
diff: declare module '@primer/components' {
  type Omit<T, K> = Pick<T, Exclude<keyof T, K>>
  import * as StyledSystem from 'styled-system'
  - import * as StyledSystemProps from '@styled-system/prop-types'
  import * as StyledComponents from 'styled-components'
  import * as History from 'history'
  @@ -12,7 +11,7 @@ declare module '@primer/components' {
  to?: History.LocationDescriptor
  }
  - interface CommonProps extends BaseProps, StyledSystemProps.color, StyledSystemProps.space {}
  + interface CommonProps extends BaseProps, StyledSystem.ColorProps, StyledSystem.SpaceProps {}
  interface LayoutProps
  extends BaseProps,
  