frontend-plugin-api: clean up output verification

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/frontend-plugin-api/src/wiring/createExtension.ts

@@ -158,9 +158,7 @@ export interface LegacyCreateExtensionOptions<
 /** @ignore */
 export type VerifyExtensionFactoryOutput<
   UDeclaredOutput extends AnyExtensionDataRef,
-  UFactoryOutput extends
-    | ExtensionDataValue<any, any>
-    | ExtensionDataContainer<any>,
+  UFactoryOutput extends ExtensionDataValue<any, any>,
 > = (
   UDeclaredOutput extends any
     ? UDeclaredOutput['config']['optional'] extends true
@@ -168,29 +166,21 @@ export type VerifyExtensionFactoryOutput<
       : UDeclaredOutput['id']
     : never
 ) extends infer IRequiredOutputIds
-  ? (
-      UFactoryOutput extends ExtensionDataValue<any, any>
-        ? UFactoryOutput['id']
-        : UFactoryOutput extends ExtensionDataContainer<infer IDataRefs>
-        ? IDataRefs['id']
-        : never
-    ) extends infer IFactoryOutputIds
-    ? [IRequiredOutputIds] extends [IFactoryOutputIds]
-      ? [IFactoryOutputIds] extends [UDeclaredOutput['id']]
-        ? {}
-        : {
-            'Error: The extension factory has undeclared output(s)': Exclude<
-              IFactoryOutputIds,
-              UDeclaredOutput['id']
-            >;
-          }
+  ? [IRequiredOutputIds] extends [UFactoryOutput['id']]
+    ? [UFactoryOutput['id']] extends [UDeclaredOutput['id']]
+      ? {}
       : {
-          'Error: The extension factory is missing the following output(s)': Exclude<
-            IRequiredOutputIds,
-            IFactoryOutputIds
+          'Error: The extension factory has undeclared output(s)': Exclude<
+            UFactoryOutput['id'],
+            UDeclaredOutput['id']
           >;
         }
-    : never
+    : {
+        'Error: The extension factory is missing the following output(s)': Exclude<
+          IRequiredOutputIds,
+          UFactoryOutput['id']
+        >;
+      }
   : never;
 
 /** @public */