From 60962a8709f0ef3587f489e15071b07ef3cec9a9 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Wed, 1 May 2019 13:57:47 -0700
Subject: [PATCH] Added test.

---
 .../compiler/omitTypeHelperModifiers01.ts     | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 tests/cases/compiler/omitTypeHelperModifiers01.ts

diff --git a/tests/cases/compiler/omitTypeHelperModifiers01.ts b/tests/cases/compiler/omitTypeHelperModifiers01.ts
new file mode 100644
index 0000000000000..da76173d3657f
--- /dev/null
+++ b/tests/cases/compiler/omitTypeHelperModifiers01.ts
@@ -0,0 +1,22 @@
+// @strict: true
+
+type A = {
+    a: number;
+    b?: string;
+    readonly c: boolean;
+    d: unknown;
+};
+
+type B = Omit<A, 'a'>;
+
+function f(x: B) {
+    const b = x.b;
+    x.b = "hello";
+    x.b = undefined;
+
+    const c = x.c;
+    x.c = true;
+
+    const d = x.d;
+    x.d = d;
+}