diff --git a/packages/firebase_remote_config/firebase_remote_config_web/lib/src/interop/firebase_remote_config.dart b/packages/firebase_remote_config/firebase_remote_config_web/lib/src/interop/firebase_remote_config.dart
index 045409fd398a..473fb662131e 100644
--- a/packages/firebase_remote_config/firebase_remote_config_web/lib/src/interop/firebase_remote_config.dart
+++ b/packages/firebase_remote_config/firebase_remote_config_web/lib/src/interop/firebase_remote_config.dart
@@ -123,7 +123,7 @@ class RemoteConfig
           remote_config_interop.getValue(jsObject, key.toJS).asString().toDart,
         ),
         getSource(
-          remote_config_interop.getValue(jsObject, key.toJS).getSource().toDart,
+          remote_config_interop.getValue(jsObject, key.toJS).asString().toDart,
         ),
       );
 
diff --git a/packages/firebase_remote_config/firebase_remote_config_web/lib/src/interop/firebase_remote_config_interop.dart b/packages/firebase_remote_config/firebase_remote_config_web/lib/src/interop/firebase_remote_config_interop.dart
index 445913d55442..4bbbb34cec76 100644
--- a/packages/firebase_remote_config/firebase_remote_config_web/lib/src/interop/firebase_remote_config_interop.dart
+++ b/packages/firebase_remote_config/firebase_remote_config_web/lib/src/interop/firebase_remote_config_interop.dart
@@ -33,7 +33,7 @@ external JSPromise fetchConfig(RemoteConfigJsImpl remoteConfig);
 
 @JS()
 @staticInterop
-external JSAny getAll(RemoteConfigJsImpl remoteConfig);
+external JSObject getAll(RemoteConfigJsImpl remoteConfig);
 
 @JS()
 @staticInterop
@@ -66,11 +66,7 @@ external JSPromise setCustomSignals(
 @staticInterop
 external void setLogLevel(RemoteConfigJsImpl remoteConfig, JSString logLevel);
 
-@JS('RemoteConfig')
-@staticInterop
-abstract class RemoteConfigJsImpl {}
-
-extension RemoteConfigJsImplExtension on RemoteConfigJsImpl {
+extension type RemoteConfigJsImpl._(JSObject _) implements JSObject {
   external AppJsImpl get app;
   external SettingsJsImpl get settings;
   external set settings(SettingsJsImpl value);
@@ -80,24 +76,14 @@ extension RemoteConfigJsImplExtension on RemoteConfigJsImpl {
   external JSString get lastFetchStatus;
 }
 
-@JS()
-@staticInterop
-@anonymous
-abstract class ValueJsImpl {}
-
-extension ValueJsImplExtension on ValueJsImpl {
+extension type ValueJsImpl._(JSObject _) implements JSObject {
   external JSBoolean asBoolean();
   external JSNumber asNumber();
   external JSString asString();
   external JSString getSource();
 }
 
-@JS()
-@staticInterop
-@anonymous
-abstract class SettingsJsImpl {}
-
-extension SettingsJsImplExtension on SettingsJsImpl {
+extension type SettingsJsImpl._(JSObject _) implements JSObject {
   external JSNumber get minimumFetchIntervalMillis;
   external set minimumFetchIntervalMillis(JSNumber value);
   external JSNumber get fetchTimeoutMillis;
@@ -115,18 +101,13 @@ abstract class ConfigUpdateObserver {
   });
 }
 
-extension ConfigUpdateObserverJsImpl on ConfigUpdateObserver {
+extension type ConfigUpdateObserverJsImpl._(JSObject _) implements JSObject {
   external JSAny get next;
   external JSAny get error;
   external JSAny get complete;
 }
 
-@JS()
-@staticInterop
-@anonymous
-abstract class ConfigUpdateJsImpl {}
-
-extension ConfigUpdateJsImplExtension on ConfigUpdateJsImpl {
+extension type ConfigUpdateJsImpl._(JSObject _) implements JSObject {
   external JSSet getUpdatedKeys();
 }