From c29ca56658579d7dd3f9d40a281a51ae1e8d2c1f Mon Sep 17 00:00:00 2001
From: David Lechner <david@pybricks.com>
Date: Wed, 6 Apr 2022 18:16:21 -0500
Subject: [PATCH] utils: fix defined()

NonNullable means both not undefined and not null.
---
 src/utils/index.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/utils/index.ts b/src/utils/index.ts
index 23c8297b..c1d8094e 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -20,6 +20,7 @@ export function assert(condition: boolean, message: string): asserts condition {
  */
 export function defined<T>(obj: T): asserts obj is NonNullable<T> {
     assert(obj !== undefined, 'undefined object');
+    assert(obj !== null, 'null object');
 }
 
 export type Maybe<T> = [T?, Error?];