anchor.diff:          | [<CompiledName("exited")>] Exited
           | [<CompiledName("unmounted")>] Unmounted
   
  +    [<RequireQualifiedAccess>]
       type TransitionProps =
           | In of bool
           | Appear of bool
  
positive.code:         | OnExited of (Browser.HTMLElement -> unit)
          | Children of U2<React.ReactNode, TransitionStatus -> React.ReactNode>
          | ClassNames of U2<string, CSSTransitionClassNames>
          | Ref of (obj -> obj)
          | Key of string
          static member Custom(key: string, value: obj): CSSTransitionProps =
              unbox(key, value)
  
      type TransitionGroupProps =
          | Component of React.ReactType
          | ChildFactory of (React.ReactElement -> React.ReactElement)
          | Ref of (obj -> obj)
          | Key of string
          static member Custom(key: string, value: obj): TransitionGroupProps =
  
negative.code:         exitDone: string option
      }
  
      [<RequireQualifiedAccess>]
      type CSSTransitionProps =
          | In of bool
          | Appear of bool
  