1 files changed, 24 insertions, 0 deletions
diff --git a/components/script/dom/webidls/ExtendableMessageEvent.webidl b/components/script/dom/webidls/ExtendableMessageEvent.webidl
new file mode 100644
index 00000000000..4190757d1f2
--- /dev/null
+++ b/components/script/dom/webidls/ExtendableMessageEvent.webidl
@@ -0,0 +1,24 @@
+/* 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/. */
+
+// https://w3c.github.io/ServiceWorker/#extendablemessage-event-section
+
+[Constructor(DOMString type, optional ExtendableMessageEventInit eventInitDict),
+ Exposed=ServiceWorker,
+ Pref="dom.serviceworker.enabled"]
+interface ExtendableMessageEvent : ExtendableEvent {
+  readonly attribute any data;
+  readonly attribute DOMString origin;
+  readonly attribute DOMString lastEventId;
+  // [SameObject] readonly attribute (Client or ServiceWorker /*or MessagePort*/)? source;
+  // readonly attribute FrozenArray<MessagePort>? ports;
+};
+
+dictionary ExtendableMessageEventInit : ExtendableEventInit {
+  any data;
+  DOMString origin;
+  DOMString lastEventId;
+  // (Client or ServiceWorker /*or MessagePort*/)? source;
+  // sequence<MessagePort>? ports;
+};