build_runner/lib/src/generate/directory_watcher_factory.dart

// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:io';

import 'package:watcher/watcher.dart';

DirectoryWatcher defaultDirectoryWatcherFactory(String path) =>
    // TODO: Use `DirectoryWatcher` on windows. See the following issues:
    // - https://github.com/dart-lang/build/issues/1031
    // - https://github.com/dart-lang/watcher/issues/52
    Platform.isWindows ? PollingDirectoryWatcher(path) : DirectoryWatcher(path);