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I did a research but found that problem only in node.js context, or react context but from a long time ago, and guys say that upgrading their firebase helped. Mine was installed just last month.

Basically I'm using React with firebase api, and I this code:

firebase.auth().signInWithEmailAndPassword('an email', 'a password);

Throws the following error:
TypeError: WEBPACK_IMPORTED_MODULE_2__firebase.a.auth is not a function

Of course I'm importing firebase:

import firebase from '../../firebase';

All the other firebase commands work just fine.

Has anyone had an experience with that problem using react.js ?

Thanks a lot in advance

First check your path is correct, if is, try to delete the node_modules folder and make npm install again !

Just posting the answer, maybe to help others. The simple solution (thanks to think-twice) is to import "firebase/auth". Here is an example of the Firebase file:

import firebase from 'firebase/app';
import 'firebase/storage';
import "firebase/database";
import "firebase/auth"


 // Initialize Firebase
 var config = 
 apiKey: "*********************",
 authDomain: "...",
 databaseURL: "...",
 projectId: "....",
 storageBucket: "....",
 messagingSenderId: "..."
 ;
 firebase.initializeApp(config);

 const storage = firebase.storage();

 export 
 storage, firebase as default