directInstanceOf: Fix handling of undefined and null

Fixes #199
2023-10-15 16:01:29 +07:00 · 2023-10-15 16:01:29 +07:00 · e7e2213e91
commit e7e2213e91
parent 9d6c91ee58
2 changed files with 7 additions and 0 deletions
--- a/source/index.ts
+++ b/source/index.ts
@ -413,6 +413,10 @@ export function isDate(value: unknown): value is Date {
 }

 export function isDirectInstanceOf<T>(instance: unknown, class_: Class<T>): instance is T {
+	if (instance === undefined || instance === null) {
+		return false;
+	}
+
 	return Object.getPrototypeOf(instance) === class_.prototype;
 }