From 149fc1d18ef897f775b9bdfaa69d67ed2c930c91 Mon Sep 17 00:00:00 2001
From: "Markus J. Ankenbrand" <iimog@iimog.org>
Date: Wed, 12 May 2021 16:49:27 +0200
Subject: [PATCH] feat: allow type guards for filter (#39) (#40)

---
 packages/tidy/src/filter.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/tidy/src/filter.ts b/packages/tidy/src/filter.ts
index 53b1060..814c339 100644
--- a/packages/tidy/src/filter.ts
+++ b/packages/tidy/src/filter.ts
@@ -4,6 +4,12 @@ import { TidyFn } from './types';
  * Filters items
  * @param filterFn Returns true to keep the item, false to filter out
  */
+export function filter<T extends object, O extends T>(
+  filterFn: (item: T, index: number, array: T[]) => item is O
+): TidyFn<T, O>;
+export function filter<T extends object>(
+  filterFn: (item: T, index: number, array: T[]) => boolean
+): TidyFn<T>;
 export function filter<T extends object>(
   filterFn: (item: T, index: number, array: T[]) => boolean
 ): TidyFn<T> {