From 82e2725154e0fe42b475c4c458241b5f46545a46 Mon Sep 17 00:00:00 2001
From: Alex Rickabaugh <alx+alxhub@alxandria.net>
Date: Fri, 10 Aug 2018 11:15:59 +0100
Subject: [PATCH] fix(ivy): handle the case where no base factory is found
 (#25425)

When an Angular decorated class is inherited, it might be the case that
the entire inheritance chain actually has no constructor defined. In
that event, a factory which simply instantiates the type without any
arguments should be used.

PR Close #25425
---
 packages/core/src/render3/di.ts | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/packages/core/src/render3/di.ts b/packages/core/src/render3/di.ts
index a539e0972b..28eced1bda 100644
--- a/packages/core/src/render3/di.ts
+++ b/packages/core/src/render3/di.ts
@@ -777,13 +777,17 @@ export function getFactoryOf<T>(type: Type<any>): ((type?: Type<T>) => T)|null {
 }
 
 export function getInheritedFactory<T>(type: Type<any>): (type: Type<T>) => T {
-  debugger;
   const proto = Object.getPrototypeOf(type.prototype).constructor as Type<any>;
   const factory = getFactoryOf<T>(proto);
-  if (factory === null) {
-    throw new Error(`Type ${proto.name} does not support inheritance`);
+  if (factory !== null) {
+    return factory;
+  } else {
+    // There is no factory defined. Either this was improper usage of inheritance
+    // (no Angular decorator on the superclass) or there is no constructor at all
+    // in the inheritance chain. Since the two cases cannot be distinguished, the
+    // latter has to be assumed.
+    return (t) => new t();
   }
-  return factory;
 }
 
 class TemplateRef<T> implements viewEngine.TemplateRef<T> {