An OOP-base Nodejs project for Onesignal
Set your APP ID & REST KEY in notifications.js where sendNotification() method is defined.
Then go to app.js and after instantiating the notifications.js,call its sendNotification() method and pass the heading, content & playerIds.
If your want to send all, there is no need to pass the third argument; but if you want, you can pass specific playerIds as a simple array.
So with this library you can send notifications to all or specific playerIds.