Version info

Angular: 6.1.7

Firebase: 5.5.0

AngularFire: 5.0.0

Other (e.g. Ionic/Cordova, Node, browser, operating system):

How to reproduce these conditions

Failing test unit, Plunkr, or JSFiddle demonstrating the problem
It's just a typo in one of your markdown files

Steps to set up and reproduce

Sample data and security rules

<-- include/attach/link to some json sample data (or provide credentials to a sanitized, test Firebase project) -->

Debug output

** Errors in the JavaScript console **

** Output from firebase.database().enableLogging(true); **

** Screenshots **

Expected behavior

No typo

Actual behavior

Typo

https://github.com/angular/angularfire2/blame/master/docs/messaging/messaging.md#L18
This reference should be to AngularFireMessagingModule and not AngularFireStorageModule