1 files changed, 29 insertions, 0 deletions
diff --git a/dom/webidl/WritableStreamDefaultWriter.webidl b/dom/webidl/WritableStreamDefaultWriter.webidl
new file mode 100644
index 0000000000..e033079f04
--- /dev/null
+++ b/dom/webidl/WritableStreamDefaultWriter.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#default-writer-class-definition
+ */
+
+[Exposed=*]
+interface WritableStreamDefaultWriter {
+  [Throws]
+  constructor(WritableStream stream);
+
+  readonly attribute Promise<undefined> closed;
+  [Throws] readonly attribute unrestricted double? desiredSize;
+  readonly attribute Promise<undefined> ready;
+
+  [Throws]
+  Promise<undefined> abort(optional any reason);
+
+  [NewObject]
+  Promise<undefined> close();
+
+  undefined releaseLock();
+
+  [NewObject]
+  Promise<undefined> write(optional any chunk);
+};