Onesignal push function does not exist on type 'typeof OneSignal'

Here is the code:

OneSignal.push(() => { OneSignal.isPushNotificationsEnabled(function(isEnabled: any) {   if (isEnabled)     console.log("Push notifications are already enabled!");   else     console.log("Push notifications are not enabled yet.");     OneSignal.showHttpPrompt(); });

});

Hey I am trying to add the notification popup on mobile app through the above code, but this create the warning: