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