Function onVisibilityChange

onVisibilityChange(callback: (visible: boolean) => void): void
Registers a callback to be invoked whenever the page visibility changes.
Parameters
- callback: (visible: boolean) => void
  Function to call with true when page is visible, false when hidden.
Returns void
Example
```
onVisibilityChange((visible) => {
  if (visible) {
    console.log("Page is now visible");
  } else {
    console.log("Page is hidden");
  }
});
```
Since
1.1.0
- Defined in browser/onVisibilityChange.ts:20