Function useViewportTracking

useViewportTracking(
options: UseViewportTrackingOptions,
): UseViewportTrackingReturn
Tracks whether a component is visible in the viewport and fires a component view event when visibility and time thresholds are met.
Parameters
- options: UseViewportTrackingOptions
  UseViewportTrackingOptions including the entry, thresholds, and personalization data.
Returns UseViewportTrackingReturn
An object with isVisible state and an onLayout callback for the tracked View
Throws
Error if called outside of an OptimizationProvider

Remarks
Uses useScrollContext if available, otherwise falls back to screen dimensions. The hook tracks only once per component instance — subsequent visibility events are ignored.
Example
```
function TrackedEntry({ entry }: { entry: Entry }) {
  const { onLayout, isVisible } = useViewportTracking({
    entry,
    threshold: 0.8,
    viewTimeMs: 2000,
  })

  return (
    <View onLayout={onLayout}>
      <Text>{isVisible ? 'Visible' : 'Hidden'}</Text>
    </View>
  )
}
```
- Defined in packages/react-native-sdk/src/hooks/useViewportTracking.ts:148