Type 'T[K]' does not satisfy the constraint installing angular fire

@ioclaudio wrote:

Hi,
I’d like to use Firebase FCM in an Ionic4 app.
I’ve seen that a common way to do this is to use the @angular/fire library.

I have installed it in this way:

npm install @angular/fire firebase --save

But, when I start the app, I have this error:

[ng] ERROR in node_modules/@angular/fire/angularfire2.d.ts(37,49): error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any[]) => any'.
[ng] node_modules/@angular/fire/angularfire2.d.ts(40,49): error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any[]) => any'.
[ng] node_modules/@angular/fire/angularfire2.d.ts(48,78): error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any[]) => any'.
[ng] node_modules/@angular/fire/angularfire2.d.ts(48,107): error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any[]) => any'.
[ng] node_modules/@angular/fire/angularfire2.d.ts(50,75): error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any[]) => any'.
[ng] node_modules/@angular/fire/angularfire2.d.ts(50,96): error TS2344: Type 'T[K]' does not satisfy the constraint '(...args: any[]) => any'.
[ng] src/app/app.module.ts(63,26): error TS2307: Cannot find module '@ionic-native/firebase/ngx'.
[ng] src/app/services/fcmmanager.service.ts(2,26): error TS2307: Cannot find module '@ionic-native/firebase/ngx'.
[ng]

I can see that in the package.json file I have:

+    "@angular/fire": "^6.0.0",
+    "firebase": "^7.14.2",

Have you ever used this library?
What version of @angular/fire and firebase are you using and are compatible with Ionic4?

Thank you very much

Claudio

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