// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This is not a spec interface. Instead, it is used to generate bindings
// so that Blink code which wishes to create a stream can derive from
// UnderlyingSourceBase, and a JavaScript object can then be generated
// automatically for use in initializing a ReadableStream.

[
    NoInterfaceObject
]
interface UnderlyingSourceBase {
    [CallWith=ScriptState, ImplementedAs=startWrapper] Promise<void> start(any stream);
    [CallWith=ScriptState] Promise<void> pull();
    [CallWith=ScriptState, ImplementedAs=cancelWrapper] Promise<void> cancel(optional any reason);

    // This only exists to prevent Object.prototype.type being accessed.
    [CallWith=ScriptState] readonly attribute any type;
};