lib: add cause to DOMException

PR-URL: https://github.com/nodejs/node/pull/44703
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/test/parallel/test-domexception-cause.js b/test/parallel/test-domexception-cause.js
new file mode 100644
index 00000000000..179ef6d212a
--- /dev/null
+++ b/test/parallel/test-domexception-cause.js
@@ -0,0 +1,33 @@
+'use strict';
+
+require('../common');
+const { strictEqual, deepStrictEqual } = require('assert');
+
+{
+  const domException = new DOMException('no cause', 'abc');
+  strictEqual(domException.name, 'abc');
+  strictEqual('cause' in domException, false);
+  strictEqual(domException.cause, undefined);
+}
+
+{
+  const domException = new DOMException('with undefined cause', { name: 'abc', cause: undefined });
+  strictEqual(domException.name, 'abc');
+  strictEqual('cause' in domException, true);
+  strictEqual(domException.cause, undefined);
+}
+
+{
+  const domException = new DOMException('with string cause', { name: 'abc', cause: 'foo' });
+  strictEqual(domException.name, 'abc');
+  strictEqual('cause' in domException, true);
+  strictEqual(domException.cause, 'foo');
+}
+
+{
+  const object = { reason: 'foo' };
+  const domException = new DOMException('with object cause', { name: 'abc', cause: object });
+  strictEqual(domException.name, 'abc');
+  strictEqual('cause' in domException, true);
+  deepStrictEqual(domException.cause, object);
+}