diff --git a/pkgs/file/lib/src/backends/chroot.dart b/pkgs/file/lib/src/backends/chroot.dart
index 72ce3ca5b..5c90a4f80 100644
--- a/pkgs/file/lib/src/backends/chroot.dart
+++ b/pkgs/file/lib/src/backends/chroot.dart
@@ -4,7 +4,6 @@
 
 library file.src.backends.chroot;
 
-import 'dart:async';
 import 'dart:convert';
 import 'dart:typed_data';
 
diff --git a/pkgs/file/lib/src/backends/local/local_file_system.dart b/pkgs/file/lib/src/backends/local/local_file_system.dart
index 069c43631..635998e10 100644
--- a/pkgs/file/lib/src/backends/local/local_file_system.dart
+++ b/pkgs/file/lib/src/backends/local/local_file_system.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/src/io.dart' as io;
 import 'package:file/file.dart';
 import 'package:path/path.dart' as p;
diff --git a/pkgs/file/lib/src/backends/memory/memory_directory.dart b/pkgs/file/lib/src/backends/memory/memory_directory.dart
index 729453d63..63e40d284 100644
--- a/pkgs/file/lib/src/backends/memory/memory_directory.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_directory.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/file.dart';
 import 'package:file/src/common.dart' as common;
 import 'package:file/src/io.dart' as io;
diff --git a/pkgs/file/lib/src/backends/memory/memory_file_system.dart b/pkgs/file/lib/src/backends/memory/memory_file_system.dart
index 9bb82dbb9..adb5e0acd 100644
--- a/pkgs/file/lib/src/backends/memory/memory_file_system.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_file_system.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/file.dart';
 import 'package:file/src/io.dart' as io;
 import 'package:path/path.dart' as p;
diff --git a/pkgs/file/lib/src/backends/memory/memory_file_system_entity.dart b/pkgs/file/lib/src/backends/memory/memory_file_system_entity.dart
index d473dabb1..cdf64e320 100644
--- a/pkgs/file/lib/src/backends/memory/memory_file_system_entity.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_file_system_entity.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/file.dart';
 import 'package:file/src/common.dart' as common;
 import 'package:file/src/io.dart' as io;
diff --git a/pkgs/file/lib/src/backends/memory/memory_link.dart b/pkgs/file/lib/src/backends/memory/memory_link.dart
index b22e2fd6f..31c084a15 100644
--- a/pkgs/file/lib/src/backends/memory/memory_link.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_link.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/file.dart';
 import 'package:file/src/common.dart' as common;
 import 'package:file/src/io.dart' as io;
diff --git a/pkgs/file/lib/src/forwarding/forwarding_directory.dart b/pkgs/file/lib/src/forwarding/forwarding_directory.dart
index c14d95797..640f9361a 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_directory.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_directory.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/src/io.dart' as io;
 import 'package:file/file.dart';
 
diff --git a/pkgs/file/lib/src/forwarding/forwarding_file.dart b/pkgs/file/lib/src/forwarding/forwarding_file.dart
index a5fde1b4b..3a8c795b9 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_file.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_file.dart
@@ -2,7 +2,6 @@
 // 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:async';
 import 'dart:convert';
 import 'dart:typed_data';
 
diff --git a/pkgs/file/lib/src/forwarding/forwarding_file_system.dart b/pkgs/file/lib/src/forwarding/forwarding_file_system.dart
index 6d027cfc9..d864db94c 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_file_system.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_file_system.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/src/io.dart' as io;
 import 'package:file/file.dart';
 import 'package:meta/meta.dart';
diff --git a/pkgs/file/lib/src/forwarding/forwarding_file_system_entity.dart b/pkgs/file/lib/src/forwarding/forwarding_file_system_entity.dart
index 75804a9f8..3c41b39b4 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_file_system_entity.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_file_system_entity.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/src/io.dart' as io;
 import 'package:file/file.dart';
 import 'package:meta/meta.dart';
diff --git a/pkgs/file/lib/src/forwarding/forwarding_link.dart b/pkgs/file/lib/src/forwarding/forwarding_link.dart
index 6dd040384..bf3ba3b95 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_link.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_link.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:file/src/io.dart' as io;
 import 'package:file/file.dart';
 
diff --git a/pkgs/file/lib/src/interface/directory.dart b/pkgs/file/lib/src/interface/directory.dart
index 4162d1558..e62ad8c18 100644
--- a/pkgs/file/lib/src/interface/directory.dart
+++ b/pkgs/file/lib/src/interface/directory.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import '../io.dart' as io;
 
 import 'file.dart';
diff --git a/pkgs/file/lib/src/interface/file.dart b/pkgs/file/lib/src/interface/file.dart
index ad5047511..d4267e4a9 100644
--- a/pkgs/file/lib/src/interface/file.dart
+++ b/pkgs/file/lib/src/interface/file.dart
@@ -2,7 +2,6 @@
 // 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:async';
 import 'dart:convert';
 
 import '../io.dart' as io;
diff --git a/pkgs/file/lib/src/interface/file_system.dart b/pkgs/file/lib/src/interface/file_system.dart
index b0cc9fd6b..79ef6b87e 100644
--- a/pkgs/file/lib/src/interface/file_system.dart
+++ b/pkgs/file/lib/src/interface/file_system.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 
diff --git a/pkgs/file/lib/src/interface/file_system_entity.dart b/pkgs/file/lib/src/interface/file_system_entity.dart
index 71cb667f8..a377397a8 100644
--- a/pkgs/file/lib/src/interface/file_system_entity.dart
+++ b/pkgs/file/lib/src/interface/file_system_entity.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import '../io.dart' as io;
 
 import 'directory.dart';
diff --git a/pkgs/file/lib/src/interface/link.dart b/pkgs/file/lib/src/interface/link.dart
index 433b56059..27874b34a 100644
--- a/pkgs/file/lib/src/interface/link.dart
+++ b/pkgs/file/lib/src/interface/link.dart
@@ -2,8 +2,6 @@
 // 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:async';
-
 import '../io.dart' as io;
 
 import 'file_system_entity.dart';