1 files changed, 22 insertions, 0 deletions
diff --git a/components/script_bindings/webidls/Transformer.webidl b/components/script_bindings/webidls/Transformer.webidl
new file mode 100644
index 00000000000..652511450a4
--- /dev/null
+++ b/components/script_bindings/webidls/Transformer.webidl
@@ -0,0 +1,22 @@
+/* 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/#transformer-api
+ */
+
+[GenerateInit]
+dictionary Transformer {
+  TransformerStartCallback start;
+  TransformerTransformCallback transform;
+  TransformerFlushCallback flush;
+  TransformerCancelCallback cancel;
+  any readableType;
+  any writableType;
+};
+
+callback TransformerStartCallback = any (TransformStreamDefaultController controller);
+callback TransformerFlushCallback = Promise<undefined> (TransformStreamDefaultController controller);
+callback TransformerTransformCallback = Promise<undefined> (any chunk, TransformStreamDefaultController controller);
+callback TransformerCancelCallback = Promise<undefined> (any reason);