0. Install ionic globally

npm i -g ionic

1. Install firebase globally

npm i -g firebase-tools

2. Go to folder where you will create new ionic project and run:

ionic start myNewProject

3. cd myNewProject

4. Install ionic Lab

npm i @ionic/lab --save

5. Install angularFire & firebase

npm i @angular/fire firebase --save

6. Fix RXJS Error

npm i rxjs@6 rxjs-comat@6 --save

7. Create Project in firebase

npm i rxjs@6 rxjs-comat@6 --save

8. (Optional) Change to lazy loading

• Delete page
• Create new one
• ionic g page home
• Remove references (app.module & app.component)

9. Uncomment service worker in index.html

10. Config firebase

• firebase login
• firebase init

11. Build production

• • If there is building error run
  • npm i @angular-devkit/build-optimizer --save
• ionic build --prod --optimize
• Deploy firebase deploy

12. Create One Signal project

• Change (icon, name, add files) manifest.json