Function isPageVisible$

Creates an observable that emits when the [page visibility]https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API changes. It also emits the current visibility immediately upon subscription.

isPageVisible$().subscribe((isVisible) => {
  if (isVisible) {
    console.log('Page is visible');
  } else {
    console.log('Page is hidden');
  }
});
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Note that for Angular projects, there is a harness available to help with tests that use this function in @s-libs/ng-dev.