From 0833e72d06a73a546fb4b00d9bdcbc1f9693b660 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Burzy=C5=84ski?= <mateuszburzynski@gmail.com>
Date: Mon, 26 Sep 2022 12:53:43 +0200
Subject: [PATCH] Make `assert` method an assertion function in TS

---
 lib/types.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/types.ts b/lib/types.ts
index ce998b46..d75630c8 100644
--- a/lib/types.ts
+++ b/lib/types.ts
@@ -27,7 +27,7 @@ abstract class BaseType<T> {
 
   abstract check(value: any, deep?: Deep): value is T;
 
-  assert(value: any, deep?: Deep): value is T {
+  assert(value: any, deep?: Deep): asserts value is T {
     if (!this.check(value, deep)) {
       var str = shallowStringify(value);
       throw new Error(str + " does not match type " + this);