ionic cordova platform add android
or ionic cordova platform add ios
.ionic cordova plugin add onesignal-cordova-plugin
src/app/app.component.ts
and update "5c9ca215-e7c5-4214-8a45-6f2e1b84c12f"
with your OneSignal App Id.See our Ionic v1 branch if you are still mantaining an older project.
See OneSignal's Ionic SDK Setup guide for full instructions on adding to your existing project.