TS2322: Type 'Element | undefined' is not assignable to type 'Element'. Type 'undefined' is not assignable to type 'ReactElement<any, any>'

[shifenhutu]

thanks very much for your project

i hope if the currentSelectedTask === undefine , do not render the second <Pane>

but i got a ts error:
TS2322: Type 'Element | undefined' is not assignable to type 'Element'.   Type 'undefined' is not assignable to type 'ReactElement<any, any>

[shifenhutu]

if i change my code to this:

 {currentSelectedTask !== undefined ? (
            <Pane className={"pane"}> pane 222</Pane>
          ) : (
            <></>
          )}

its work, but , it has two pane in the dom:

[shifenhutu]

maybe we need to let the SplitPane children support null

[yyllff]

maybe we need to let the SplitPane children support null

最近有点忙，你有时间可以修复一下，然后提一个merge request。我得忙完了这阵才有精力看这个问题。