Function onXRSessionStart

onXRSessionStart(fn): void
Add a listener for when an XR session starts This event is triggered when the XR session is started, either by the user or by the application before all other XR start events
Parameters
- fn: ((evt: XRSessionEventArgs) => void)
  The function to call when the XR session starts
  - - (evt): void
    - Parameters
      evt: XRSessionEventArgs
      Returns void
Returns void
Example
```
onXRSessionStart((evt) => {
  console.log("XR session started", evt);
});
```