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)

使用链接的 CodePen 重现 OnBeforeHover 行为，并检查组件的类型定义，其中声称 callback 同时包含 event 和 datapoints。跟踪 callback 的暴露方式，并确认返回值除了 mouse event 之外还包含 datapoints。