third_party/blink/renderer/modules/filesystem/file_system_writer.idl

// Copyright 2018 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.

// https://wicg.github.io/writable-files/#filesystemwriter
[
    NoInterfaceObject,
    RuntimeEnabled=WritableFiles
] interface FileSystemWriter {
    // TODO(mek): 'any' really is 'Blob or ReadableStream', but that's not
    // currently supported by our bindings.
    [CallWith=ScriptState, RaisesException] Promise<void> write(unsigned long long position, any data);
    [CallWith=ScriptState] Promise<void> truncate(unsigned long long size);

    [CallWith=ScriptState] Promise<void> close();
};