fix(adapters): allow already initialized firebase app 🐛 (#6230)

* 🐛 Fix already initialized firebase app

* remove comment

Co-authored-by: Jérémie Sellam <[email protected]>
Co-authored-by: Thang Vu <[email protected]>

Author: 3 people

packages/adapter-firebase/src/getFirebase.ts

@@ -0,0 +1,11 @@
+import { initializeApp, getApps, FirebaseOptions } from "firebase/app"
+
+export default function getFirebase(firebaseOptions: FirebaseOptions) {
+  const apps = getApps()
+  const app = apps.find((app) => app.name === firebaseOptions.projectId)
+  if (app) {
+    return app
+  } else {
+    return initializeApp(firebaseOptions)
+  }
+}

packages/adapter-firebase/src/index.ts

@@ -25,6 +25,7 @@ import type {
 } from "next-auth/adapters"
 
 import { getConverter } from "./converter"
+import getFirebase from "./getFirebase"
 
 export type IndexableObject = Record<string, unknown>
 
@@ -39,7 +40,7 @@ export function FirestoreAdapter({
   emulator,
   ...firebaseOptions
 }: FirebaseOptions & FirestoreAdapterOptions): Adapter {
-  const firebaseApp = initializeApp(firebaseOptions)
+  const firebaseApp = getFirebase(firebaseOptions)
   const db = getFirestore(firebaseApp)
 
   if (emulator) {