convert social login to extension type

Author: navaronbracke

lib/src/web/static_interop/account.dart

@@ -52,5 +52,8 @@ extension type Accounts(JSObject _) {
   external Session get session;
 
   /// Login using a social provider.
-  external void Function(SocialLoginParameters parameters) socialLogin;
+  /// 
+  /// This function receives a [SocialLoginParameters] instance as argument,
+  /// and has [JSVoid] as return type.
+  external JSFunction socialLogin;
 }

lib/src/web/static_interop/parameters/login.dart

@@ -24,15 +24,18 @@ extension type LoginParameters._(JSObject _) implements JSObject {
   });
 }
 
-/// This class represents the parameters for the `Accounts.socialLogin` method.
+/// This extension type represents the parameters for the `Accounts.socialLogin` method.
 @JS()
 @anonymous
 @staticInterop
-class SocialLoginParameters {
+extension type SocialLoginParameters._(JSObject _) implements JSObject {
   /// Create a new [SocialLoginParameters] instance.
+  /// 
+  /// The [callback] receives a [LoginResponse] as argument,
+  /// and has [JSVoid] as return type.
   external factory SocialLoginParameters({
     String? authFlow,
-    void Function(LoginResponse response) callback,
+    JSFunction callback,
     String? conflictHandling,
     String? extraFields,
     String? facebookExtraPermissions,