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-rw-r--r--components/script/dom/webidls/UnderlyingSource.webidl21
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diff --git a/components/script/dom/webidls/UnderlyingSource.webidl b/components/script/dom/webidls/UnderlyingSource.webidl
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+/* 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 https://mozilla.org/MPL/2.0/. */
+
+// https://streams.spec.whatwg.org/#underlying-source-api
+
+[GenerateInit]
+dictionary UnderlyingSource {
+ UnderlyingSourceStartCallback start;
+ UnderlyingSourcePullCallback pull;
+ UnderlyingSourceCancelCallback cancel;
+ ReadableStreamType type;
+ [EnforceRange] unsigned long long autoAllocateChunkSize;
+};
+
+typedef (ReadableStreamDefaultController or ReadableByteStreamController) ReadableStreamController;
+
+callback UnderlyingSourceStartCallback = any (ReadableStreamController controller);
+callback UnderlyingSourcePullCallback = Promise<undefined> (ReadableStreamController controller);
+callback UnderlyingSourceCancelCallback = Promise<undefined> (optional any reason);
+