From 2f637db5af20edd7ca808c4a26e15d03adf29551 Mon Sep 17 00:00:00 2001
From: intellild <intellild@outlook.com>
Date: Fri, 29 Jul 2022 03:25:33 +0000
Subject: [PATCH] allow 'undefined' value for value provider

---
 src/__tests__/global-container.test.ts | 7 +++++++
 src/providers/value-provider.ts        | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/__tests__/global-container.test.ts b/src/__tests__/global-container.test.ts
index 5685d03..b6d68f3 100644
--- a/src/__tests__/global-container.test.ts
+++ b/src/__tests__/global-container.test.ts
@@ -553,6 +553,13 @@ test("registers by value provider", () => {
   expect(globalContainer.isRegistered(registration.token)).toBeTruthy();
 });
 
+test("value provider with 'undefined' value should work fine", () => {
+  globalContainer.register("Foo", {
+    useValue: undefined
+  });
+  expect(globalContainer.resolve("Foo")).toBe(undefined);
+});
+
 test("registers by token provider", () => {
   const registration = {
     token: "IBar",
diff --git a/src/providers/value-provider.ts b/src/providers/value-provider.ts
index 63fef06..c704b40 100644
--- a/src/providers/value-provider.ts
+++ b/src/providers/value-provider.ts
@@ -7,5 +7,5 @@ export default interface ValueProvider<T> {
 export function isValueProvider<T>(
   provider: Provider<T>
 ): provider is ValueProvider<T> {
-  return (provider as ValueProvider<T>).useValue != undefined;
+  return Object.prototype.hasOwnProperty.call(provider, "useValue");
 }