Checks if type(path) returns FileSystemEntityType.directory.
static Future<bool> isDirectory(String path) =>
    _getType(_toUtf8Array(path), true)
        .then((type) => (type == FileSystemEntityType.directory));
    © 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
    https://api.dart.dev/stable/2.5.0/dart-io/FileSystemEntity/isDirectory.html