Let user specify the firebase app name

src/__tests__/createUser.test.ts

@@ -1,4 +1,6 @@
 import { signOut } from 'firebase/auth'
+import { setConfig } from 'src/config'
+import createMockConfig from 'src/testHelpers/createMockConfig'
 import {
   createMockFirebaseUserClientSDK,
   createMockFirebaseUserAdminSDK,
@@ -8,6 +10,8 @@ import {
 jest.mock('firebase/auth')
 jest.mock('firebase/app')
 
+const mockSetConfig = jest.mocked(setConfig)
+
 afterEach(() => {
   jest.clearAllMocks()
 })
@@ -117,6 +121,9 @@ describe('createUser: basic tests', () => {
 describe('createUser: firebaseUserClientSDK', () => {
   it('returns the expected data', () => {
     expect.assertions(1)
+    mockSetConfig({
+      ...createMockConfig(),
+    })
     const createUser = require('src/createUser').default
     const firebaseUserJSSDK = createMockFirebaseUserClientSDK()
     expect(createUser({ firebaseUserClientSDK: firebaseUserJSSDK })).toEqual({
@@ -138,6 +145,9 @@ describe('createUser: firebaseUserClientSDK', () => {
 
   it('returns the expected data when custom claims are included', () => {
     expect.assertions(1)
+    mockSetConfig({
+      ...createMockConfig(),
+    })
     const createUser = require('src/createUser').default
     const customClaims = {
       foo: 'bar',
@@ -170,6 +180,9 @@ describe('createUser: firebaseUserClientSDK', () => {
 
   it('does not throw when custom claims are defined but the client user is not defined', () => {
     expect.assertions(1)
+    mockSetConfig({
+      ...createMockConfig(),
+    })
     const createUser = require('src/createUser').default
     expect(() => {
       createUser({
@@ -186,6 +199,9 @@ describe('createUser: firebaseUserClientSDK', () => {
 
   it('returns the expected value from getIdToken', async () => {
     expect.assertions(1)
+    mockSetConfig({
+      ...createMockConfig(),
+    })
     const createUser = require('src/createUser').default
     const user = createUser({
       firebaseUserClientSDK: createMockFirebaseUserClientSDK(),
@@ -196,6 +212,9 @@ describe('createUser: firebaseUserClientSDK', () => {
 
   it('returns the expected value from serialize', async () => {
     expect.assertions(1)
+    mockSetConfig({
+      ...createMockConfig(),
+    })
     const createUser = require('src/createUser').default
     const user = createUser({
       firebaseUserClientSDK: createMockFirebaseUserClientSDK(),
@@ -219,6 +238,9 @@ describe('createUser: firebaseUserClientSDK', () => {
 
   it("calls Firebase's signOut method when we call user.signOut", async () => {
     expect.assertions(1)
+    mockSetConfig({
+      ...createMockConfig(),
+    })
     const createUser = require('src/createUser').default
     const user = createUser({
       firebaseUserClientSDK: createMockFirebaseUserClientSDK(),
@@ -521,6 +543,9 @@ describe('createUser: serializedUser', () => {
 
   it("does not call Firebase's signOut method when we call user.signOut (it should be a noop)", async () => {
     expect.assertions(1)
+    mockSetConfig({
+      ...createMockConfig(),
+    })
     const createUser = require('src/createUser').default
     const user = createUser({
       serializedUser: createMockSerializedUser(),

src/__tests__/initFirebaseClientSDK.test.ts

@@ -30,12 +30,15 @@ describe('initFirebaseClientSDK', () => {
     expect.assertions(1)
     const initFirebaseClientSDK = require('src/initFirebaseClientSDK').default
     initFirebaseClientSDK()
-    expect(mockInitializeApp).toHaveBeenCalledWith({
-      apiKey: 'fakeAPIKey123',
-      authDomain: 'my-example-app.firebaseapp.com',
-      databaseURL: 'https://my-example-app.firebaseio.com',
-      projectId: 'my-example-app-id',
-    })
+    expect(mockInitializeApp).toHaveBeenCalledWith(
+      {
+        apiKey: 'fakeAPIKey123',
+        authDomain: 'my-example-app.firebaseapp.com',
+        databaseURL: 'https://my-example-app.firebaseio.com',
+        projectId: 'my-example-app-id',
+      },
+      'example-app-name'
+    )
   })
 
   it('does not call firebase.initializeApp if Firebase already has an initialized app', () => {

src/__tests__/redirects.test.ts

@@ -3,7 +3,7 @@ import type { ParsedUrlQuery } from 'querystring'
 import { getLoginRedirectInfo, getAppRedirectInfo } from 'src/redirects'
 import getMockConfig from 'src/testHelpers/createMockConfig'
 import { setConfig } from 'src/config'
-import { User } from 'src/createUser'
+import { User } from 'src/sharedTypes'
 import { RedirectInput } from 'src/redirectTypes'
 
 describe('redirects', () => {

src/__tests__/withUser.test.tsx

@@ -8,7 +8,8 @@ import {
   createMockFirebaseUserClientSDK,
 } from 'src/testHelpers/userInputs'
 import useUser from 'src/useUser'
-import createUser, { User } from 'src/createUser'
+import createUser from 'src/createUser'
+import { User } from 'src/sharedTypes'
 import useFirebaseUser from 'src/useFirebaseUser'
 import { AuthAction } from 'src/AuthAction'
 import logDebug from 'src/logDebug'

src/configTypes.ts

@@ -1,6 +1,6 @@
 import Cookies from 'cookies'
 import { PageURL } from './redirectTypes'
-import { User } from './createUser'
+import { User } from './sharedTypes'
 import { Spread } from './Spread'
 
 type OnErrorHandler = (error: Error) => void
@@ -90,6 +90,7 @@ export interface ConfigInput {
     // "G-MEASUREMENT_ID"
     measurementId?: string
   }
+  firebaseClientAppName?: string
   tenantId?: string
   cookies: Omit<Cookies.Option & Cookies.SetOption, 'sameSite'> & {
     // The base name for the auth cookies.
@@ -110,6 +111,7 @@ export const defaultConfig = {
   onVerifyTokenError: (_err: Error) => {},
   // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
   onTokenRefreshError: (_err: Error) => {},
+  firebaseClientAppName: 'example-app-name',
   cookies: {
     // Required to be provided by the user.
     // name: undefined,

src/createUser.ts

@@ -3,6 +3,8 @@ import { User as FirebaseUser } from 'firebase/auth'
 import { DecodedIdToken } from 'firebase-admin/auth'
 import isClientSide from 'src/isClientSide'
 import { Claims, filterStandardClaims } from 'src/claims'
+import { User } from './sharedTypes'
+import { getConfig } from './config'
 
 interface UserDeserialized {
   id?: string
@@ -30,22 +32,6 @@ interface CreateUserInput {
 
 type getIdToken = (forceRefresh?: boolean) => Promise<string | null>
 
-export interface User {
-  id: string | null
-  email: string | null
-  emailVerified: boolean
-  phoneNumber: string | null
-  displayName: string | null
-  photoURL: string | null
-  claims: Record<string, string | boolean>
-  tenantId: string | null
-  getIdToken: (forceRefresh?: boolean) => Promise<string | null>
-  clientInitialized: boolean
-  firebaseUser: FirebaseUser | null
-  signOut: () => Promise<void>
-  serialize: (a?: { includeToken?: boolean }) => string
-}
-
 /**
  * Take a representation of a Firebase user from a maximum of one of:
  * the Firebase JS SDK, Firebase admin SDK, or serialized User instance.
@@ -119,8 +105,9 @@ const createUser = ({
       const { getApp } = require('firebase/app')
       // eslint-disable-next-line global-require,  @typescript-eslint/no-var-requires
       const { getAuth, signOut } = require('firebase/auth')
+      const { firebaseClientAppName } = getConfig()
 
-      signOutFunc = async () => signOut(getAuth(getApp()))
+      signOutFunc = async () => signOut(getAuth(getApp(firebaseClientAppName)))
     }
 
     /**

src/firebaseAdmin.ts

@@ -1,6 +1,7 @@
 import { getAuth as getAdminAuth } from 'firebase-admin/auth'
 import initFirebaseAdminSDK from 'src/initFirebaseAdminSDK'
-import createUser, { User } from 'src/createUser'
+import createUser from 'src/createUser'
+import { User } from 'src/sharedTypes'
 import { getConfig } from 'src/config'
 import logDebug from 'src/logDebug'
 import { FirebaseError as FirebaseErrorType } from 'firebase-admin/app'

src/getUserFromCookies.ts

@@ -1,4 +1,5 @@
-import createUser, { User } from 'src/createUser'
+import createUser from 'src/createUser'
+import { User } from 'src/sharedTypes'
 import { getCookie } from 'src/cookies'
 import { verifyIdToken } from 'src/firebaseAdmin'
 import {

src/initFirebaseClientSDK.ts

@@ -4,16 +4,20 @@ import { getConfig } from 'src/config'
 import logDebug from 'src/logDebug'
 
 export default function initFirebaseClientSDK() {
-  const { firebaseClientInitConfig, firebaseAuthEmulatorHost, tenantId } =
-    getConfig()
+  const {
+    firebaseClientInitConfig,
+    firebaseAuthEmulatorHost,
+    tenantId,
+    firebaseClientAppName,
+  } = getConfig()
   if (!getApps().length) {
     if (!firebaseClientInitConfig) {
       throw new Error(
         'If not initializing the Firebase JS SDK elsewhere, you must provide "firebaseClientInitConfig" to next-firebase-auth.'
       )
     }
 
-    initializeApp(firebaseClientInitConfig)
+    initializeApp(firebaseClientInitConfig, firebaseClientAppName)
     if (tenantId) {
       getAuth().tenantId = tenantId
     }
@@ -25,6 +29,9 @@ export default function initFirebaseClientSDK() {
   }
   // If the user has provided the firebaseAuthEmulatorHost address, set the emulator
   if (firebaseAuthEmulatorHost) {
-    connectAuthEmulator(getAuth(getApp()), `http://${firebaseAuthEmulatorHost}`)
+    connectAuthEmulator(
+      getAuth(getApp(firebaseClientAppName)),
+      `http://${firebaseAuthEmulatorHost}`
+    )
   }
 }

src/redirectTypes.ts

@@ -1,6 +1,6 @@
 import type { GetServerSidePropsContext, Redirect } from 'next'
 import type { ParsedUrlQuery } from 'querystring'
-import { User } from './createUser'
+import { User } from './sharedTypes'
 
 export type URLResolveFunction = (obj: {
   ctx?: GetServerSidePropsContext<ParsedUrlQuery>

src/redirects.ts

@@ -1,6 +1,6 @@
 import type { GetServerSidePropsContext } from 'next'
 
-import { User } from 'src/createUser'
+import { User } from 'src/sharedTypes'
 import { getConfig } from 'src/config'
 import {
   PageURL,

src/setAuthCookies.ts

@@ -3,7 +3,8 @@ import { setCookie } from 'src/cookies'
 import { getUserCookieName, getUserTokensCookieName } from 'src/authCookies'
 import { getConfig } from 'src/config'
 import logDebug from 'src/logDebug'
-import createUser, { User } from 'src/createUser'
+import createUser from 'src/createUser'
+import { User } from 'src/sharedTypes'
 import { NextApiRequest, NextApiResponse } from 'next'
 
 export type SetAuthCookies = (

src/sharedTypes.ts

@@ -0,0 +1,17 @@
+import { User as FirebaseUser } from 'firebase/auth'
+
+export interface User {
+  id: string | null
+  email: string | null
+  emailVerified: boolean
+  phoneNumber: string | null
+  displayName: string | null
+  photoURL: string | null
+  claims: Record<string, string | boolean>
+  tenantId: string | null
+  getIdToken: (forceRefresh?: boolean) => Promise<string | null>
+  clientInitialized: boolean
+  firebaseUser: FirebaseUser | null
+  signOut: () => Promise<void>
+  serialize: (a?: { includeToken?: boolean }) => string
+}

src/testHelpers/createMockConfig.ts

@@ -29,6 +29,7 @@ const createMockConfig = ({ clientSide }: { clientSide?: boolean } = {}) => {
       databaseURL: 'https://my-example-app.firebaseio.com',
       projectId: 'my-example-app-id',
     },
+    firebaseClientAppName: 'example-app-name',
     cookies: {
       name: 'someExample',
       keys: useClientSideConfig ? [] : ['abc', 'def'],

src/useFirebaseUser.ts

@@ -7,7 +7,8 @@ import {
   onIdTokenChanged,
 } from 'firebase/auth'
 import { getConfig } from 'src/config'
-import createUser, { User } from 'src/createUser'
+import createUser from 'src/createUser'
+import { User } from 'src/sharedTypes'
 import { Claims, filterStandardClaims } from 'src/claims'
 import logDebug from 'src/logDebug'
 
@@ -175,7 +176,10 @@ const useFirebaseUser = () => {
     }
 
     // https://firebase.google.com/docs/reference/js/firebase.auth.Auth#onidtokenchanged
-    const unsubscribe = onIdTokenChanged(getAuth(getApp()), onIdTokenChange)
+
+    const { firebaseClientAppName } = getConfig()
+    const app = getApp(firebaseClientAppName)
+    const unsubscribe = onIdTokenChanged(getAuth(app), onIdTokenChange)
     return () => {
       unsubscribe()
       isCancelled = true

src/useUser.tsx

@@ -1,5 +1,5 @@
 import { createContext, useContext } from 'react'
-import { User } from './createUser'
+import { User } from './sharedTypes'
 
 type UserContext =
   | (User & {

src/withUserTokenSSR.ts

@@ -10,7 +10,7 @@ import getUserFromCookies from 'src/getUserFromCookies'
 import { AuthAction } from 'src/AuthAction'
 import { getLoginRedirectInfo, getAppRedirectInfo } from 'src/redirects'
 import logDebug from 'src/logDebug'
-import { User } from './createUser'
+import { User } from './sharedTypes'
 import { PageURL } from './redirectTypes'
 
 export interface WithUserSSROptions {