From 43aaf07a9673e378fba2aabb01b5d4c53b08713b Mon Sep 17 00:00:00 2001
From: na-trium-144 <100704180+na-trium-144@users.noreply.github.com>
Date: Tue, 19 Sep 2023 16:06:24 +0900
Subject: [PATCH 1/2] add support for size property at lengthOf

---
 types/chai/index.d.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/types/chai/index.d.ts b/types/chai/index.d.ts
index 9f5cb99cdc30c0..4c11cc9ec24be7 100644
--- a/types/chai/index.d.ts
+++ b/types/chai/index.d.ts
@@ -1210,7 +1210,11 @@ declare namespace Chai {
          * @param length   Potential expected length of object.
          * @param message   Message to display on error.
          */
-        lengthOf<T extends { readonly length?: number | undefined }>(object: T, length: number, message?: string): void;
+        lengthOf<T extends { readonly length?: number | undefined } | { readonly size?: number | undefined }>(
+            object: T,
+            length: number,
+            message?: string,
+        ): void;
 
         /**
          * Asserts that fn will throw an error.

From 3f3b729d675692dae60c4eb6b723a022b32bf757 Mon Sep 17 00:00:00 2001
From: na-trium-144 <100704180+na-trium-144@users.noreply.github.com>
Date: Tue, 19 Sep 2023 16:27:24 +0900
Subject: [PATCH 2/2] add test for length of map and set

---
 types/chai/chai-tests.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/types/chai/chai-tests.ts b/types/chai/chai-tests.ts
index cc264d598330d9..0b549cd9f0becc 100644
--- a/types/chai/chai-tests.ts
+++ b/types/chai/chai-tests.ts
@@ -1809,6 +1809,8 @@ suite("assert", () => {
         assert.lengthOf("foobar", 6);
         assert.lengthOf("foobar", 5);
         assert.lengthOf({ length: 1 }, 5);
+        assert.lengthOf(new Set([1, 2, 3]), 3);
+        assert.lengthOf(new Map([['a', 1], ['b', 2], ['c', 3]]), 3);
     });
 
     test("match", () => {