> This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

The event object passed to the handler function for Firebase Authentication events.

**Signature:**

    export interface AuthEvent<T> extends CloudEvent<T> 

**Extends:** [CloudEvent](https://firebase.google.com/docs/reference/functions/2nd-gen/node/firebase-functions.cloudevent#cloudevent_interface)\<T\>

## Properties

| Property | Type | Description |
|---|---|---|
| [project](https://firebase.google.com/docs/reference/functions/2nd-gen/node/firebase-functions.identity.authevent#identityautheventproject) | string | ***(BETA)*** The project identifier. |
| [tenantId](https://firebase.google.com/docs/reference/functions/2nd-gen/node/firebase-functions.identity.authevent#identityautheventtenantid) | string | ***(BETA)*** The ID of the Identity Platform tenant associated with the event, if applicable. |

## identity.AuthEvent.project

> This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

The project identifier.

**Signature:**

    project?: string;

## identity.AuthEvent.tenantId

> This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.

The ID of the Identity Platform tenant associated with the event, if applicable.

**Signature:**

    tenantId?: string;