diff --git a/src/SuspenseSubject.ts b/src/SuspenseSubject.ts
index 0c52b9b5..5b7ef884 100644
--- a/src/SuspenseSubject.ts
+++ b/src/SuspenseSubject.ts
@@ -1,6 +1,6 @@
 import { empty, Observable, Subject, Subscriber, Subscription } from 'rxjs';
 import { catchError, shareReplay, tap } from 'rxjs/operators';
-import { ObservableStatus } from './useObservable';
+import { ObservableStatus } from './useObservable.js';
 
 export class SuspenseSubject<T> extends Subject<T> {
   private _value: T | undefined;
diff --git a/src/auth.tsx b/src/auth.tsx
index 9fba1a46..6e74d6c5 100644
--- a/src/auth.tsx
+++ b/src/auth.tsx
@@ -1,9 +1,9 @@
 import * as React from 'react';
 import { user } from 'rxfire/auth';
-import { preloadObservable, ReactFireOptions, useAuth, useObservable, ObservableStatus, ReactFireError } from './';
+import { preloadObservable, ReactFireOptions, useAuth, useObservable, ObservableStatus, ReactFireError } from './index.js';
 import { from, of, defer } from 'rxjs';
 import { map, switchMap } from 'rxjs/operators';
-import { useSuspenseEnabledFromConfigAndContext } from './firebaseApp';
+import { useSuspenseEnabledFromConfigAndContext } from './firebaseApp.js';
 
 import type { Auth, User, IdTokenResult } from 'firebase/auth';
 type Claims = IdTokenResult['claims'];
diff --git a/src/database.tsx b/src/database.tsx
index 3cfa9224..5c5f998c 100644
--- a/src/database.tsx
+++ b/src/database.tsx
@@ -1,5 +1,5 @@
 import { list, object, QueryChange, listVal, objectVal } from 'rxfire/database';
-import { ReactFireOptions, useObservable, checkIdField, ObservableStatus, ReactFireGlobals } from './';
+import { ReactFireOptions, useObservable, checkIdField, ObservableStatus, ReactFireGlobals } from './index.js';
 
 import type { Query as DatabaseQuery, DatabaseReference } from 'firebase/database';
 
diff --git a/src/firestore.tsx b/src/firestore.tsx
index d5efa8bd..ed504f97 100644
--- a/src/firestore.tsx
+++ b/src/firestore.tsx
@@ -1,6 +1,6 @@
 import { collectionData, doc, docData, fromRef } from 'rxfire/firestore';
-import { ReactFireOptions, useObservable, checkIdField, ReactFireGlobals } from './';
-import { preloadObservable, ObservableStatus } from './useObservable';
+import { ReactFireOptions, useObservable, checkIdField, ReactFireGlobals } from './index.js';
+import { preloadObservable, ObservableStatus } from './useObservable.js';
 import { first } from 'rxjs/operators';
 
 import { Query as FirestoreQuery, QuerySnapshot, DocumentReference, queryEqual, DocumentData, DocumentSnapshot } from 'firebase/firestore';
diff --git a/src/functions.tsx b/src/functions.tsx
index e9f1f34b..d30be15b 100644
--- a/src/functions.tsx
+++ b/src/functions.tsx
@@ -1,7 +1,7 @@
 import { httpsCallable as rxHttpsCallable } from 'rxfire/functions';
 import { defer } from 'rxjs';
-import { ReactFireOptions, useObservable, ObservableStatus } from './';
-import { useFunctions } from '.';
+import { ReactFireOptions, useObservable, ObservableStatus } from './index.js';
+import { useFunctions } from './index.js';
 
 import type { HttpsCallableOptions } from 'firebase/functions';
 
diff --git a/src/index.ts b/src/index.ts
index ab60a1fe..028a4a62 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-import { SuspenseSubject } from './SuspenseSubject';
+import { SuspenseSubject } from './SuspenseSubject.js';
 
 import type { Query as FirestoreQuery } from 'firebase/firestore';
 import type { Query as DatabaseQuery } from 'firebase/database';
@@ -48,13 +48,13 @@ export function checkIdField(options: ReactFireOptions) {
   return checkOptions(options, 'idField');
 }
 
-export * from './auth';
-export * from './database';
-export * from './firebaseApp';
-export * from './firestore';
-export * from './functions';
-export * from './performance';
-export * from './remote-config';
-export * from './storage';
-export * from './useObservable';
-export * from './sdk';
+export * from './auth.js';
+export * from './database.js';
+export * from './firebaseApp.js';
+export * from './firestore.js';
+export * from './functions.js';
+export * from './performance.js';
+export * from './remote-config.js';
+export * from './storage.js';
+export * from './useObservable.js';
+export * from './sdk.js';
diff --git a/src/remote-config.tsx b/src/remote-config.tsx
index 97376fb8..83b398a0 100644
--- a/src/remote-config.tsx
+++ b/src/remote-config.tsx
@@ -1,5 +1,5 @@
-import { useRemoteConfig } from './';
-import { useObservable, ObservableStatus } from './useObservable';
+import { useRemoteConfig } from './index.js';
+import { useObservable, ObservableStatus } from './useObservable.js';
 import { getValue, getString, getBoolean, getNumber, getAll, AllParameters } from 'rxfire/remote-config';
 import { Observable } from 'rxjs';
 
diff --git a/src/sdk.tsx b/src/sdk.tsx
index ee66ffff..c3238604 100644
--- a/src/sdk.tsx
+++ b/src/sdk.tsx
@@ -9,11 +9,11 @@ import type { Functions } from 'firebase/functions';
 import type { FirebasePerformance } from 'firebase/performance';
 import type { FirebaseStorage } from 'firebase/storage';
 import type { RemoteConfig } from 'firebase/remote-config';
-import { useFirebaseApp } from './firebaseApp';
+import { useFirebaseApp } from './firebaseApp.js';
 import { FirebaseApp } from 'firebase/app';
-import { ObservableStatus, useObservable } from './useObservable';
+import { ObservableStatus, useObservable } from './useObservable.js';
 import { from } from 'rxjs';
-import { ReactFireOptions } from '.';
+import { ReactFireOptions } from './index.js';
 
 export const AppCheckSdkContext = React.createContext<AppCheck | undefined>(undefined);
 export const AuthSdkContext = React.createContext<Auth | undefined>(undefined);
diff --git a/src/storage.tsx b/src/storage.tsx
index 92f27a51..6bb1ccb3 100644
--- a/src/storage.tsx
+++ b/src/storage.tsx
@@ -1,8 +1,8 @@
 import * as React from 'react';
 import { getDownloadURL, fromTask } from 'rxfire/storage';
 import { defer } from 'rxjs';
-import { ReactFireOptions, useObservable, ObservableStatus, useStorage } from './';
-import { useSuspenseEnabledFromConfigAndContext } from './firebaseApp';
+import { ReactFireOptions, useObservable, ObservableStatus, useStorage } from './index.js';
+import { useSuspenseEnabledFromConfigAndContext } from './firebaseApp.js';
 import { ref } from 'firebase/storage';
 
 import type { UploadTask, UploadTaskSnapshot, StorageReference, FirebaseStorage } from 'firebase/storage';
diff --git a/src/useObservable.ts b/src/useObservable.ts
index 9e6173a8..f66a5522 100644
--- a/src/useObservable.ts
+++ b/src/useObservable.ts
@@ -1,9 +1,9 @@
 import * as React from 'react';
 import { useSyncExternalStore } from 'use-sync-external-store/shim';
 import { Observable } from 'rxjs';
-import { SuspenseSubject } from './SuspenseSubject';
-import { useSuspenseEnabledFromConfigAndContext } from './firebaseApp';
-import { ReactFireGlobals, ReactFireOptions } from './';
+import { SuspenseSubject } from './SuspenseSubject.js';
+import { useSuspenseEnabledFromConfigAndContext } from './firebaseApp.js';
+import { ReactFireGlobals, ReactFireOptions } from './index.js';
 
 const DEFAULT_TIMEOUT = 30_000;