third_party/blink/renderer/modules/file_system_access/file_system_file_handle.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/native-file-system/#filesystemfilehandle
[
    Exposed=(Window,Worker),
    SecureContext,
    Serializable,
    RuntimeEnabled=NativeFileSystem,
    ImplementedAs=NativeFileSystemFileHandle
] interface FileSystemFileHandle : FileSystemHandle {
    [CallWith=ScriptState, RaisesException] Promise<FileSystemWritableFileStream> createWritable(optional FileSystemCreateWriterOptions options = {});
    [CallWith=ScriptState, RaisesException] Promise<File> getFile();
};