OnBeforeHover returns just an event rather than datapoints and an event

The title really says it all. I've attempted to set up an example in codePen (taking my code and boiling it down), however, the older versions didn't even call OnBeforeHover so I tried updating the versions, but I'm not at all familiar with the way in which scripts are loaded in via HTML tags, I think I've done it correctly, however, I have access to neither createPlotlyComponent nor plotComponentFactory in my code.

https://codepen.io/tim-logan/pen/NWgbBvr?editors=1010

I'm attempting to get enough data to make the hover only be active near the line rather than the entire fill, but it's a lot harder if I only have the mouse event.

Oh, and just for clarity, what I get out is NOT

{
  event: mouseEvent,
  points: [] /undefined etc
  ...
}

What I get out is just

event: mouseEvent

(The type definitions claims I should get the first out though)

リンクされたCodePenを使用してOnBeforeHoverの動作を再現し、コールバックにイベントとdatapointsの両方が含まれると記載されているコンポーネントの型定義を調べてください。コールバックがどのように公開されているかを追跡し、返される値にマウスイベントだけでなくdatapointsも含まれていることを確認してください。