From 2f215ea34c0012db1808023f59cfe15c6c392ccc Mon Sep 17 00:00:00 2001
From: "Acid Chicken (硫酸鶏)" <root@acid-chicken.com>
Date: Sun, 3 Feb 2019 04:31:03 +0900
Subject: Use `is` syntax (#4079)

---
 src/misc/is-objectid.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/misc')

diff --git a/src/misc/is-objectid.ts b/src/misc/is-objectid.ts
index 8c1aabd568..c3148a7785 100644
--- a/src/misc/is-objectid.ts
+++ b/src/misc/is-objectid.ts
@@ -1,3 +1,5 @@
-export default function(x: any): boolean {
+import { ObjectID } from 'mongodb';
+
+export default function(x: any): x is ObjectID {
 	return x.hasOwnProperty('toHexString') || x.hasOwnProperty('_bsontype');
 }
-- 
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