From 004fb4cb76bbbf74ed3b78379e67cc53cfa9ecc9 Mon Sep 17 00:00:00 2001
From: flakey5 <73616808+flakey5@users.noreply.github.com>
Date: Sat, 17 Sep 2022 12:49:30 -0700
Subject: [PATCH] lib: add cause to DOMException

---
 lib/internal/per_context/domexception.js | 29 +++++++++++++++++----
 test/parallel/test-domexception-cause.js | 33 ++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 5 deletions(-)
 create mode 100644 test/parallel/test-domexception-cause.js

diff --git a/lib/internal/per_context/domexception.js b/lib/internal/per_context/domexception.js
index 917e2c00bccda9..35f1b266bee912 100644
--- a/lib/internal/per_context/domexception.js
+++ b/lib/internal/per_context/domexception.js
@@ -49,12 +49,31 @@ const disusedNamesSet = new SafeSet()
   .add('ValidationError');
 
 class DOMException {
-  constructor(message = '', name = 'Error') {
+  constructor(message = '', options = 'Error') {
     ErrorCaptureStackTrace(this);
-    internalsMap.set(this, {
-      message: `${message}`,
-      name: `${name}`
-    });
+
+    if (options && typeof options === 'object') {
+      const { name } = options;
+      internalsMap.set(this, {
+        message: `${message}`,
+        name: `${name}`
+      });
+
+      if ('cause' in options) {
+        ObjectDefineProperty(this, 'cause', { 
+          __proto__: null,
+          value: options.cause,
+          configurable: true,
+          writable: true,
+          enumerable: false,
+        });
+      }
+    } else {
+      internalsMap.set(this, {
+        message: `${message}`,
+        name: `${options}`
+      });
+    }
   }
 
   get name() {
diff --git a/test/parallel/test-domexception-cause.js b/test/parallel/test-domexception-cause.js
new file mode 100644
index 00000000000000..179ef6d212ae13
--- /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);
+}