From 54308f762d64f4d8e1dc05044aea23efb25d7efe Mon Sep 17 00:00:00 2001
From: Fielding Johnston <fielding@justfielding.com>
Date: Wed, 7 Apr 2021 14:55:38 -0500
Subject: [PATCH] Add additional function overload for derived

---
 src/runtime/store/index.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/runtime/store/index.ts b/src/runtime/store/index.ts
index 45877d861f59..cf15db5250b9 100644
--- a/src/runtime/store/index.ts
+++ b/src/runtime/store/index.ts
@@ -133,6 +133,20 @@ export function derived<S extends Stores, T>(
 	initial_value?: T
 ): Readable<T>;
 
+/**
+ * Derived value store by synchronizing one or more readable stores and
+ * applying an aggregation function over its input values.
+ *
+ * @param stores - input stores
+ * @param fn - function callback that aggregates the values
+ * @param initial_value - initial value
+ */
+export function derived<S extends Stores, T>(
+	stores: S,
+	fn: (values: StoresValues<S>) => T,
+	initial_value?: T
+): Readable<T>;
+
 /**
  * Derived value store by synchronizing one or more readable stores and
  * applying an aggregation function over its input values.