Use `is` syntax (#4079)

2f215ea3 · Acid Chicken (硫酸鶏) · syuilo · c44c7779 · 2f215ea3
Commit 2f215ea3 authored 6 years ago by Acid Chicken (硫酸鶏) Committed by syuilo 6 years ago
--- a/src/misc/is-objectid.ts
+++ b/src/misc/is-objectid.ts
-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');
 }