Interface for an `Auth` error.

**Signature:**

    export interface AuthError extends FirebaseError 

**Extends:** [FirebaseError](https://firebase.google.com/docs/reference/js/util.firebaseerror#firebaseerror_class)

## Properties

| Property | Type | Description |
|---|---|---|
| [customData](https://firebase.google.com/docs/reference/js/auth.autherror#autherrorcustomdata) | { readonly appName: string; readonly email?: string; readonly phoneNumber?: string; readonly tenantId?: string; } | Details about the Firebase Auth error. |

## AuthError.customData

Details about the Firebase Auth error.

**Signature:**

    readonly customData: {
            readonly appName: string;
            readonly email?: string;
            readonly phoneNumber?: string;
            readonly tenantId?: string;
        };