From 8e388ed2a779b652a359b8e5b19c3656c1d34b88 Mon Sep 17 00:00:00 2001
From: Peter Wagenet <peter.wagenet@gmail.com>
Date: Thu, 19 Oct 2023 10:45:45 -0700
Subject: [PATCH 1/4] Fix keepLatest types

---
 ember-resources/src/util/keep-latest.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ember-resources/src/util/keep-latest.ts b/ember-resources/src/util/keep-latest.ts
index 97f226d73..c46224b99 100644
--- a/ember-resources/src/util/keep-latest.ts
+++ b/ember-resources/src/util/keep-latest.ts
@@ -69,7 +69,7 @@ interface Options<T = unknown> {
  */
 export function keepLatest<Return = unknown>({ when, value: valueFn }: Options<Return>) {
   return resource(() => {
-    let previous: Return | undefined;
+    let previous: Return;
 
     return () => {
       let value = valueFn();

From 40469f06f1d1e1bef3e962b975d510629d45ac88 Mon Sep 17 00:00:00 2001
From: Peter Wagenet <peter.wagenet@gmail.com>
Date: Thu, 19 Oct 2023 11:14:54 -0700
Subject: [PATCH 2/4] Add type test

---
 ember-resources/type-tests/keep-latest.test.ts | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 ember-resources/type-tests/keep-latest.test.ts

diff --git a/ember-resources/type-tests/keep-latest.test.ts b/ember-resources/type-tests/keep-latest.test.ts
new file mode 100644
index 000000000..219fa8e1e
--- /dev/null
+++ b/ember-resources/type-tests/keep-latest.test.ts
@@ -0,0 +1,12 @@
+import { expectTypeOf } from 'expect-type';
+
+import { keepLatest } from '../src/util/keep-latest';
+
+const foo: boolean = true;
+
+const value = keepLatest({
+  value: () => foo,
+  when: () => true
+});
+
+expectTypeOf(value).toMatchTypeOf<boolean>();

From d63d7b7d72702babc195fe70142741d3d083e290 Mon Sep 17 00:00:00 2001
From: NullVoxPopuli <199018+NullVoxPopuli@users.noreply.github.com>
Date: Thu, 19 Oct 2023 22:43:00 -0600
Subject: [PATCH 3/4] Add changeset

---
 .changeset/sour-coats-shop.md | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 .changeset/sour-coats-shop.md

diff --git a/.changeset/sour-coats-shop.md b/.changeset/sour-coats-shop.md
new file mode 100644
index 000000000..4e6325e35
--- /dev/null
+++ b/.changeset/sour-coats-shop.md
@@ -0,0 +1,9 @@
+---
+"ember-resources": patch
+---
+
+The `keepLatest` utility previously incorrectly had a `| undefined` type for the return value.
+That's been removed.
+
+`| undefined` is still a valid type if the passed value is possibly `| undefined`.
+This made the `| undefined` on `keepLatest` redundant.

From 11c4d6277fb70c1e3b105245c054df32e508d733 Mon Sep 17 00:00:00 2001
From: NullVoxPopuli <199018+NullVoxPopuli@users.noreply.github.com>
Date: Thu, 19 Oct 2023 22:50:17 -0600
Subject: [PATCH 4/4] lint:fix

---
 ember-resources/type-tests/keep-latest.test.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ember-resources/type-tests/keep-latest.test.ts b/ember-resources/type-tests/keep-latest.test.ts
index 219fa8e1e..9c6d34883 100644
--- a/ember-resources/type-tests/keep-latest.test.ts
+++ b/ember-resources/type-tests/keep-latest.test.ts
@@ -6,7 +6,7 @@ const foo: boolean = true;
 
 const value = keepLatest({
   value: () => foo,
-  when: () => true
+  when: () => true,
 });
 
 expectTypeOf(value).toMatchTypeOf<boolean>();