From 808267e6e8008f764eca87aa31a71bff373d802d Mon Sep 17 00:00:00 2001
From: Jonatan Magnusson <jonatan.magnusson@gmail.com>
Date: Tue, 17 Sep 2019 12:56:14 +0200
Subject: [PATCH] Make Chai PropertyChange argument 'property' optional
 (#38405)

Chai allows passing a single argument to its increase,
decrease and change tests:

```ts
let y;
expect(() => { y += 1 }).to.increase(() => y);
```

The type definitions of PropertyChange, used by the three
tests mentionds, did not allow passing a single argument.
---
 types/chai/index.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/types/chai/index.d.ts b/types/chai/index.d.ts
index c3af20d432..238a00daa4 100644
--- a/types/chai/index.d.ts
+++ b/types/chai/index.d.ts
@@ -379,7 +379,7 @@ declare namespace Chai {
     }
 
     interface PropertyChange {
-        (object: Object, property: string, message?: string): Assertion;
+        (object: Object, property?: string, message?: string): Assertion;
     }
 
     export interface Assert {