You can execute code in a handler that gets called before a survey is shown and after it has been dismissed. You can use this for things like pausing and resuming a game, for example.

Before Showing the Survey

Surveys.onShowCallback(() => {
  //Perform any changes before the survey appears.
});

After the Survey Has Been Dismissed

Surveys.onDismissCallback(() => {
  //Perform any changes before the survey disappears.
});