From c2986891f6aac87cec98232735945af756e6643f Mon Sep 17 00:00:00 2001
From: Yusuke Sakurai <kerokerokerop@gmail.com>
Date: Fri, 7 Feb 2020 16:23:38 +0900
Subject: remove non-null assertion operator from std (part1) (#3900)

---
 std/testing/format.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'std/testing/format.ts')

diff --git a/std/testing/format.ts b/std/testing/format.ts
index 953347c27..62fdde5eb 100644
--- a/std/testing/format.ts
+++ b/std/testing/format.ts
@@ -1,3 +1,5 @@
+import { assert } from "./asserts.ts";
+
 // This file is ported from pretty-format@24.0.0
 /**
  * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
@@ -361,7 +363,9 @@ const getKeysOfEnumerableProperties = (object: {}): Array<string | symbol> => {
 
   if (Object.getOwnPropertySymbols) {
     Object.getOwnPropertySymbols(object).forEach((symbol): void => {
-      if (Object.getOwnPropertyDescriptor(object, symbol)!.enumerable) {
+      const d = Object.getOwnPropertyDescriptor(object, symbol);
+      assert(d != null);
+      if (d.enumerable) {
         keys.push(symbol);
       }
     });
-- 
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