anchor.diff:          abstract onDidChangeTreeData: Event<'T option> with get
           abstract getTreeItem: 'T -> TreeItem
           abstract getChildren: 'T -> ResizeArray<'T>
  +        abstract getParent: ('T -> 'T option) option with get
   
       and TreeIconPath =
           abstract light: U3<string, Uri, ThemeIcon> with get, set
  
positive.code:         abstract filters: obj option with get,set
          abstract openLabel: string option with get,set
  
      let [<Import("version","vscode")>] version: string = failwith "JS only"
  
      type [<Import("commands","vscode")>] commands =
  
negative.code:         static member createTerminal(?name : string, ?shellPath : string, ?shellArgs : string[]) : Terminal = failwith "JS only"
          static member onDidCloseTerminal with get(): Event<Terminal> = failwith "JS only"
          static member registerTreeDataProvider<'T>(viewId: string, provider: TreeDataProvider<'T>): Disposable = failwith "JS only"
          static member createTreeView<'T>(viewId: string, options: CreateTreeViewOptions<'T>): TreeView<'T> = failwith "JS only"
          static member withProgress(options : ProgressOptions, func: Progress<ProgressMessage> -> Promise<'T> ) : Promise<'T> = failwith "JS only"
          static member showOpenDialog(options: OpenDialogOptions) : Promise<Uri[]> = failwith "JS only"
          static member showSaveDialog(options : SaveDialogOptions) : Promise<Uri> = failwith "JS only"
  