DeepSource

AVOID using the following asynchronous file I/O methods because they are much slower than their synchronous counterparts.

Directory.exists
Directory.stat
File.lastModified
File.exists
File.stat
FileSystemEntity.isDirectory
FileSystemEntity.isFile
FileSystemEntity.isLink
FileSystemEntity.type

BAD:

import 'dart:io';

Future<Null> someFunction() async {
  var file = File('/path/to/my/file');
  var now = DateTime.now();
  if ((await file.lastModified()).isBefore(now)) print('before'); // LINT
}

GOOD:

import 'dart:io';

Future<Null> someFunction() async {
  var file = File('/path/to/my/file');
  var now = DateTime.now();
  if (file.lastModifiedSync().isBefore(now)) print('before'); // OK
}

Dart Analyze

Avoid slow async `dart:io` methods DRT-W1006

Dart Analyze

Avoid slow async dart:io methods DRT-W1006

Avoid slow async `dart:io` methods DRT-W1006