chromium/src/third_party/blink/renderer/modules/file_system_access/file_system_writable_file_stream.idl

// Copyright 2019 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/file-system-access/#filesystemwritablefilestream
[
    Exposed=(Window,Worker),
    SecureContext,
    RuntimeEnabled=FileSystemAccess
 ] interface FileSystemWritableFileStream : WritableStream {
   [CallWith=ScriptState, RaisesException] Promise<void> write((BufferSource or Blob or USVString or WriteParams) data);
   [CallWith=ScriptState, RaisesException] Promise<void> truncate(unsigned long long size);
   [CallWith=ScriptState, RaisesException] Promise<void> seek(unsigned long long offset);
 };