1 files changed, 12 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/utils/assert.js b/devtools/client/debugger/src/utils/assert.js
new file mode 100644
index 0000000000..cdd05366b0
--- /dev/null
+++ b/devtools/client/debugger/src/utils/assert.js
@@ -0,0 +1,12 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+// @flow
+import { isNodeTest } from "./environment";
+
+export default function assert(condition: boolean, message: string): void {
+  if (isNodeTest() && !condition) {
+    throw new Error(`Assertion failure: ${message}`);
+  }
+}