Merge branch 'main' into merge-test_reflective_loader-package
diff --git a/.github/ISSUE_TEMPLATE/timing.md b/.github/ISSUE_TEMPLATE/timing.md
new file mode 100644
index 0000000..38a0015
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/timing.md
@@ -0,0 +1,5 @@
+---
+name: "package:timing"
+about: "Create a bug or file a feature request against package:timing."
+labels: "package:timing"
+---
\ No newline at end of file
diff --git a/.github/labeler.yml b/.github/labeler.yml
index 16a5ce8..fd072d2 100644
--- a/.github/labeler.yml
+++ b/.github/labeler.yml
@@ -112,6 +112,10 @@
   - changed-files:
     - any-glob-to-any-file: 'pkgs/test_reflective_loader/**'
 
+'package:timing':
+  - changed-files:
+    - any-glob-to-any-file: 'pkgs/timing/**'
+
 'package:unified_analytics':
   - changed-files:
     - any-glob-to-any-file: 'pkgs/unified_analytics/**'
diff --git a/.github/workflows/timing.yaml b/.github/workflows/timing.yaml
new file mode 100644
index 0000000..df77b13
--- /dev/null
+++ b/.github/workflows/timing.yaml
@@ -0,0 +1,67 @@
+name: package:timing
+
+on:
+  # Run on PRs and pushes to the default branch.
+  push:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/timing.yaml'
+      - 'pkgs/timing/**'
+  pull_request:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/timing.yaml'
+      - 'pkgs/timing/**'
+  schedule:
+    - cron: "0 0 * * 0"
+
+env:
+  PUB_ENVIRONMENT: bot.github
+
+
+defaults:
+  run:
+    working-directory: pkgs/timing/
+
+jobs:
+  # Check code formatting and static analysis on a single OS (linux)
+  # against Dart dev.
+  analyze:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sdk: [3.4, dev]
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        run: dart pub get
+      - run: dart format --output=none --set-exit-if-changed .
+        if: always() && steps.install.outcome == 'success'
+      - run: dart analyze --fatal-infos
+        if: always() && steps.install.outcome == 'success'
+
+  # Run tests on a matrix consisting of two dimensions:
+  # 1. OS: ubuntu-latest, (macos-latest, windows-latest)
+  # 2. release channel: dev, 2.2.0
+  test:
+    needs: analyze
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # Add macos-latest and/or windows-latest if relevant for this package.
+        os: [ubuntu-latest]
+        sdk: [3.4, dev]
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        run: dart pub get
+      - run: dart test --platform vm
+        if: always() && steps.install.outcome == 'success'
diff --git a/README.md b/README.md
index 74be5a9..140d6e8 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,7 @@
 | [source_span](pkgs/source_span/) | Provides a standard representation for source code locations and spans. | [![package issues](https://img.shields.io/badge/package:source_span-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Asource_span) | [![pub package](https://img.shields.io/pub/v/source_span.svg)](https://pub.dev/packages/source_span) |
 | [sse](pkgs/sse/) | Provides client and server functionality for setting up bi-directional communication through Server Sent Events (SSE) and corresponding POST requests. | [![package issues](https://img.shields.io/badge/package:sse-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Asse) | [![pub package](https://img.shields.io/pub/v/sse.svg)](https://pub.dev/packages/sse) |
 | [test_reflective_loader](pkgs/test_reflective_loader/) | Support for discovering tests and test suites using reflection. | [![package issues](https://img.shields.io/badge/package:test_reflective_loader-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Atest_reflective_loader) | [![pub package](https://img.shields.io/pub/v/test_reflective_loader.svg)](https://pub.dev/packages/test_reflective_loader) |
+| [timing](pkgs/timing/) | A simple package for tracking the performance of synchronous and asynchronous actions. | [![package issues](https://img.shields.io/badge/package:timing-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Atiming) | [![pub package](https://img.shields.io/pub/v/timing.svg)](https://pub.dev/packages/timing) |
 | [unified_analytics](pkgs/unified_analytics/) | A package for logging analytics for all Dart and Flutter related tooling to Google Analytics. | [![package issues](https://img.shields.io/badge/package:unified_analytics-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Aunified_analytics) | [![pub package](https://img.shields.io/pub/v/unified_analytics.svg)](https://pub.dev/packages/unified_analytics) |
 
 ## Publishing automation
diff --git a/pkgs/file/CHANGELOG.md b/pkgs/file/CHANGELOG.md
index 50c96c4..3a3969c 100644
--- a/pkgs/file/CHANGELOG.md
+++ b/pkgs/file/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 7.0.2-wip
+
 ## 7.0.1
 
 * Update the pubspec repository field to reflect the new package repository.
diff --git a/pkgs/file/analysis_options.yaml b/pkgs/file/analysis_options.yaml
index 8fbd2e4..d978f81 100644
--- a/pkgs/file/analysis_options.yaml
+++ b/pkgs/file/analysis_options.yaml
@@ -1,6 +1 @@
-include: package:lints/recommended.yaml
-
-analyzer:
-  errors:
-    # Allow having TODOs in the code
-    todo: ignore
+include: package:dart_flutter_team_lints/analysis_options.yaml
diff --git a/pkgs/file/example/main.dart b/pkgs/file/example/main.dart
index 7ca0bc7..b03b363 100644
--- a/pkgs/file/example/main.dart
+++ b/pkgs/file/example/main.dart
@@ -7,8 +7,8 @@
 
 Future<void> main() async {
   final FileSystem fs = MemoryFileSystem();
-  final Directory tmp = await fs.systemTempDirectory.createTemp('example_');
-  final File outputFile = tmp.childFile('output');
+  final tmp = await fs.systemTempDirectory.createTemp('example_');
+  final outputFile = tmp.childFile('output');
   await outputFile.writeAsString('Hello world!');
   print(outputFile.readAsStringSync());
 }
diff --git a/pkgs/file/lib/chroot.dart b/pkgs/file/lib/chroot.dart
index 56d2bd5..6992ad0 100644
--- a/pkgs/file/lib/chroot.dart
+++ b/pkgs/file/lib/chroot.dart
@@ -3,4 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// A file system that provides a view into _another_ `FileSystem` via a path.
+library;
+
 export 'src/backends/chroot.dart';
diff --git a/pkgs/file/lib/file.dart b/pkgs/file/lib/file.dart
index cdde9fe..c2e97b2 100644
--- a/pkgs/file/lib/file.dart
+++ b/pkgs/file/lib/file.dart
@@ -4,5 +4,7 @@
 
 /// Core interfaces containing the abstract `FileSystem` interface definition
 /// and all associated types used by `FileSystem`.
+library;
+
 export 'src/forwarding.dart';
 export 'src/interface.dart';
diff --git a/pkgs/file/lib/local.dart b/pkgs/file/lib/local.dart
index 74f506e..5b1e3cd 100644
--- a/pkgs/file/lib/local.dart
+++ b/pkgs/file/lib/local.dart
@@ -4,4 +4,6 @@
 
 /// A local file system implementation. This relies on the use of `dart:io`
 /// and is thus not suitable for use in the browser.
+library;
+
 export 'src/backends/local.dart';
diff --git a/pkgs/file/lib/memory.dart b/pkgs/file/lib/memory.dart
index c5705ef..690b65f 100644
--- a/pkgs/file/lib/memory.dart
+++ b/pkgs/file/lib/memory.dart
@@ -4,5 +4,7 @@
 
 /// An implementation of `FileSystem` that exists entirely in memory with an
 /// internal representation loosely based on the Filesystem Hierarchy Standard.
+library;
+
 export 'src/backends/memory.dart';
 export 'src/backends/memory/operations.dart';
diff --git a/pkgs/file/lib/src/backends/chroot.dart b/pkgs/file/lib/src/backends/chroot.dart
index 6082e80..402dbec 100644
--- a/pkgs/file/lib/src/backends/chroot.dart
+++ b/pkgs/file/lib/src/backends/chroot.dart
@@ -2,16 +2,16 @@
 // 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.
 
-library file.src.backends.chroot;
-
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:file/file.dart';
-import 'package:file/src/common.dart' as common;
-import 'package:file/src/io.dart' as io;
 import 'package:path/path.dart' as p;
 
+import '../common.dart' as common;
+import '../forwarding.dart';
+import '../interface.dart';
+import '../io.dart' as io;
+
 part 'chroot/chroot_directory.dart';
 part 'chroot/chroot_file.dart';
 part 'chroot/chroot_file_system.dart';
diff --git a/pkgs/file/lib/src/backends/chroot/chroot_directory.dart b/pkgs/file/lib/src/backends/chroot/chroot_directory.dart
index 8fec7b1..e094193 100644
--- a/pkgs/file/lib/src/backends/chroot/chroot_directory.dart
+++ b/pkgs/file/lib/src/backends/chroot/chroot_directory.dart
@@ -2,18 +2,18 @@
 // 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.
 
-part of file.src.backends.chroot;
+part of '../chroot.dart';
 
 class _ChrootDirectory extends _ChrootFileSystemEntity<Directory, io.Directory>
     with ForwardingDirectory<Directory>, common.DirectoryAddOnsMixin {
-  _ChrootDirectory(ChrootFileSystem fs, String path) : super(fs, path);
+  _ChrootDirectory(super.fs, super.path);
 
   factory _ChrootDirectory.wrapped(
     ChrootFileSystem fs,
     Directory delegate, {
     bool relative = false,
   }) {
-    String localPath = fs._local(delegate.path, relative: relative);
+    var localPath = fs._local(delegate.path, relative: relative);
     return _ChrootDirectory(fs, localPath);
   }
 
@@ -32,7 +32,7 @@
       if (await fileSystem.type(path) != expectedType) {
         throw common.notADirectory(path);
       }
-      FileSystemEntityType type = await fileSystem.type(newPath);
+      var type = await fileSystem.type(newPath);
       if (type != FileSystemEntityType.notFound) {
         if (type != expectedType) {
           throw common.notADirectory(newPath);
@@ -44,7 +44,7 @@
           throw common.directoryNotEmpty(newPath);
         }
       }
-      String target = await fileSystem.link(path).target();
+      var target = await fileSystem.link(path).target();
       await fileSystem.link(path).delete();
       await fileSystem.link(newPath).create(target);
       return fileSystem.directory(newPath);
@@ -60,7 +60,7 @@
       if (fileSystem.typeSync(path) != expectedType) {
         throw common.notADirectory(path);
       }
-      FileSystemEntityType type = fileSystem.typeSync(newPath);
+      var type = fileSystem.typeSync(newPath);
       if (type != FileSystemEntityType.notFound) {
         if (type != expectedType) {
           throw common.notADirectory(newPath);
@@ -72,7 +72,7 @@
           throw common.directoryNotEmpty(newPath);
         }
       }
-      String target = fileSystem.link(path).targetSync();
+      var target = fileSystem.link(path).targetSync();
       fileSystem.link(path).deleteSync();
       fileSystem.link(newPath).createSync(target);
       return fileSystem.directory(newPath);
@@ -97,17 +97,15 @@
   @override
   Future<Directory> create({bool recursive = false}) async {
     if (_isLink) {
-      switch (await fileSystem.type(path)) {
-        case FileSystemEntityType.notFound:
-          throw common.noSuchFileOrDirectory(path);
-        case FileSystemEntityType.file:
-          throw common.fileExists(path);
-        case FileSystemEntityType.directory:
+      return switch (await fileSystem.type(path)) {
+        FileSystemEntityType.notFound =>
+          throw common.noSuchFileOrDirectory(path),
+        FileSystemEntityType.file => throw common.fileExists(path),
+        FileSystemEntityType.directory =>
           // Nothing to do.
-          return this;
-        default:
-          throw AssertionError();
-      }
+          this,
+        _ => throw AssertionError()
+      };
     } else {
       return wrap(await delegate.create(recursive: recursive));
     }
@@ -137,8 +135,8 @@
     bool recursive = false,
     bool followLinks = true,
   }) {
-    Directory delegate = this.delegate as Directory;
-    String dirname = delegate.path;
+    var delegate = this.delegate as Directory;
+    var dirname = delegate.path;
     return delegate
         .list(recursive: recursive, followLinks: followLinks)
         .map((io.FileSystemEntity entity) => _denormalize(entity, dirname));
@@ -149,8 +147,8 @@
     bool recursive = false,
     bool followLinks = true,
   }) {
-    Directory delegate = this.delegate as Directory;
-    String dirname = delegate.path;
+    var delegate = this.delegate as Directory;
+    var dirname = delegate.path;
     return delegate
         .listSync(recursive: recursive, followLinks: followLinks)
         .map((io.FileSystemEntity entity) => _denormalize(entity, dirname))
@@ -158,9 +156,9 @@
   }
 
   FileSystemEntity _denormalize(io.FileSystemEntity entity, String dirname) {
-    p.Context ctx = fileSystem.path;
-    String relativePart = ctx.relative(entity.path, from: dirname);
-    String entityPath = ctx.join(path, relativePart);
+    var ctx = fileSystem.path;
+    var relativePart = ctx.relative(entity.path, from: dirname);
+    var entityPath = ctx.join(path, relativePart);
     if (entity is io.File) {
       return _ChrootFile(fileSystem, entityPath);
     } else if (entity is io.Directory) {
diff --git a/pkgs/file/lib/src/backends/chroot/chroot_file.dart b/pkgs/file/lib/src/backends/chroot/chroot_file.dart
index 4b67bc1..d6c29fc 100644
--- a/pkgs/file/lib/src/backends/chroot/chroot_file.dart
+++ b/pkgs/file/lib/src/backends/chroot/chroot_file.dart
@@ -2,20 +2,20 @@
 // 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.
 
-part of file.src.backends.chroot;
+part of '../chroot.dart';
 
 typedef _SetupCallback = dynamic Function();
 
 class _ChrootFile extends _ChrootFileSystemEntity<File, io.File>
     with ForwardingFile {
-  _ChrootFile(ChrootFileSystem fs, String path) : super(fs, path);
+  _ChrootFile(super.fs, super.path);
 
   factory _ChrootFile.wrapped(
     ChrootFileSystem fs,
     io.File delegate, {
     bool relative = false,
   }) {
-    String localPath = fs._local(delegate.path, relative: relative);
+    var localPath = fs._local(delegate.path, relative: relative);
     return _ChrootFile(fs, localPath);
   }
 
@@ -126,7 +126,7 @@
 
   @override
   Future<File> create({bool recursive = false, bool exclusive = false}) async {
-    String path = fileSystem._resolve(
+    var path = fileSystem._resolve(
       this.path,
       followLinks: false,
       notFound: recursive ? _NotFoundBehavior.mkdir : _NotFoundBehavior.allow,
@@ -158,7 +158,7 @@
 
   @override
   void createSync({bool recursive = false, bool exclusive = false}) {
-    String path = fileSystem._resolve(
+    var path = fileSystem._resolve(
       this.path,
       followLinks: false,
       notFound: recursive ? _NotFoundBehavior.mkdir : _NotFoundBehavior.allow,
diff --git a/pkgs/file/lib/src/backends/chroot/chroot_file_system.dart b/pkgs/file/lib/src/backends/chroot/chroot_file_system.dart
index 6889c98..503821f 100644
--- a/pkgs/file/lib/src/backends/chroot/chroot_file_system.dart
+++ b/pkgs/file/lib/src/backends/chroot/chroot_file_system.dart
@@ -2,7 +2,7 @@
 // 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.
 
-part of file.src.backends.chroot;
+part of '../chroot.dart';
 
 const String _thisDir = '.';
 const String _parentDir = '..';
@@ -107,7 +107,7 @@
     }
 
     value = _resolve(value, notFound: _NotFoundBehavior.throwError);
-    String realPath = _real(value, resolve: false);
+    var realPath = _real(value, resolve: false);
     switch (delegate.typeSync(realPath, followLinks: false)) {
       case FileSystemEntityType.directory:
         break;
@@ -117,7 +117,7 @@
         throw common.notADirectory(path as String);
     }
     assert(() {
-      p.Context ctx = delegate.path;
+      var ctx = delegate.path;
       return ctx.isAbsolute(value) && value == ctx.canonicalize(value);
     }());
     _cwd = value;
@@ -201,7 +201,7 @@
       throw _ChrootJailException();
     }
     // TODO(tvolkert): See if _context.relative() works here
-    String result = realPath.substring(root.length);
+    var result = realPath.substring(root.length);
     if (result.isEmpty) {
       result = _localRoot;
     }
@@ -263,8 +263,8 @@
       throw common.noSuchFileOrDirectory(path);
     }
 
-    p.Context ctx = this.path;
-    String root = _localRoot;
+    var ctx = this.path;
+    var root = _localRoot;
     List<String> parts, ledger;
     if (ctx.isAbsolute(path)) {
       parts = ctx.split(path).sublist(1);
@@ -277,9 +277,9 @@
     }
 
     String getCurrentPath() => root + ctx.joinAll(ledger);
-    Set<String> breadcrumbs = <String>{};
+    var breadcrumbs = <String>{};
     while (parts.isNotEmpty) {
-      String segment = parts.removeAt(0);
+      var segment = parts.removeAt(0);
       if (segment == _thisDir) {
         continue;
       } else if (segment == _parentDir) {
@@ -290,8 +290,8 @@
       }
 
       ledger.add(segment);
-      String currentPath = getCurrentPath();
-      String realPath = _real(currentPath, resolve: false);
+      var currentPath = getCurrentPath();
+      var realPath = _real(currentPath, resolve: false);
 
       switch (delegate.typeSync(realPath, followLinks: false)) {
         case FileSystemEntityType.directory:
@@ -333,7 +333,7 @@
           if (!breadcrumbs.add(currentPath)) {
             throw common.tooManyLevelsOfSymbolicLinks(path);
           }
-          String target = delegate.link(realPath).targetSync();
+          var target = delegate.link(realPath).targetSync();
           if (ctx.isAbsolute(target)) {
             ledger.clear();
             parts.insertAll(0, ctx.split(target).sublist(1));
diff --git a/pkgs/file/lib/src/backends/chroot/chroot_file_system_entity.dart b/pkgs/file/lib/src/backends/chroot/chroot_file_system_entity.dart
index 8e859ac..18e37cd 100644
--- a/pkgs/file/lib/src/backends/chroot/chroot_file_system_entity.dart
+++ b/pkgs/file/lib/src/backends/chroot/chroot_file_system_entity.dart
@@ -2,7 +2,7 @@
 // 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.
 
-part of file.src.backends.chroot;
+part of '../chroot.dart';
 
 abstract class _ChrootFileSystemEntity<T extends FileSystemEntity,
     D extends io.FileSystemEntity> extends ForwardingFileSystemEntity<T, D> {
@@ -103,7 +103,7 @@
 
   @override
   Future<T> delete({bool recursive = false}) async {
-    String path = fileSystem._resolve(this.path,
+    var path = fileSystem._resolve(this.path,
         followLinks: false, notFound: _NotFoundBehavior.throwError);
 
     String real(String path) => fileSystem._real(path, resolve: false);
@@ -114,7 +114,7 @@
       if (expectedType == FileSystemEntityType.link) {
         await fileSystem.delegate.link(real(path)).delete();
       } else {
-        String resolvedPath = fileSystem._resolve(p.basename(path),
+        var resolvedPath = fileSystem._resolve(p.basename(path),
             from: p.dirname(path), notFound: _NotFoundBehavior.allowAtTail);
         if (!recursive && await type(resolvedPath) != expectedType) {
           throw expectedType == FileSystemEntityType.file
@@ -132,7 +132,7 @@
 
   @override
   void deleteSync({bool recursive = false}) {
-    String path = fileSystem._resolve(this.path,
+    var path = fileSystem._resolve(this.path,
         followLinks: false, notFound: _NotFoundBehavior.throwError);
 
     String real(String path) => fileSystem._real(path, resolve: false);
@@ -143,7 +143,7 @@
       if (expectedType == FileSystemEntityType.link) {
         fileSystem.delegate.link(real(path)).deleteSync();
       } else {
-        String resolvedPath = fileSystem._resolve(p.basename(path),
+        var resolvedPath = fileSystem._resolve(p.basename(path),
             from: p.dirname(path), notFound: _NotFoundBehavior.allowAtTail);
         if (!recursive && type(resolvedPath) != expectedType) {
           throw expectedType == FileSystemEntityType.file
diff --git a/pkgs/file/lib/src/backends/chroot/chroot_link.dart b/pkgs/file/lib/src/backends/chroot/chroot_link.dart
index acbeda6..1620df9 100644
--- a/pkgs/file/lib/src/backends/chroot/chroot_link.dart
+++ b/pkgs/file/lib/src/backends/chroot/chroot_link.dart
@@ -2,18 +2,18 @@
 // 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.
 
-part of file.src.backends.chroot;
+part of '../chroot.dart';
 
 class _ChrootLink extends _ChrootFileSystemEntity<Link, io.Link>
     with ForwardingLink {
-  _ChrootLink(ChrootFileSystem fs, String path) : super(fs, path);
+  _ChrootLink(super.fs, super.path);
 
   factory _ChrootLink.wrapped(
     ChrootFileSystem fs,
     io.Link delegate, {
     bool relative = false,
   }) {
-    String localPath = fs._local(delegate.path, relative: relative);
+    var localPath = fs._local(delegate.path, relative: relative);
     return _ChrootLink(fs, localPath);
   }
 
diff --git a/pkgs/file/lib/src/backends/chroot/chroot_random_access_file.dart b/pkgs/file/lib/src/backends/chroot/chroot_random_access_file.dart
index 4105ac8..10bbd70 100644
--- a/pkgs/file/lib/src/backends/chroot/chroot_random_access_file.dart
+++ b/pkgs/file/lib/src/backends/chroot/chroot_random_access_file.dart
@@ -2,7 +2,7 @@
 // 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.
 
-part of file.src.backends.chroot;
+part of '../chroot.dart';
 
 class _ChrootRandomAccessFile with ForwardingRandomAccessFile {
   _ChrootRandomAccessFile(this.path, this.delegate);
diff --git a/pkgs/file/lib/src/backends/local/local_directory.dart b/pkgs/file/lib/src/backends/local/local_directory.dart
index e23e68f..3e1db61 100644
--- a/pkgs/file/lib/src/backends/local/local_directory.dart
+++ b/pkgs/file/lib/src/backends/local/local_directory.dart
@@ -2,10 +2,10 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/common.dart' as common;
-import 'package:file/src/io.dart' as io;
-
+import '../../common.dart' as common;
+import '../../forwarding.dart';
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'local_file_system_entity.dart';
 
 /// [Directory] implementation that forwards all calls to `dart:io`.
@@ -13,7 +13,7 @@
     with ForwardingDirectory<LocalDirectory>, common.DirectoryAddOnsMixin {
   /// Instantiates a new [LocalDirectory] tied to the specified file system
   /// and delegating to the specified [delegate].
-  LocalDirectory(FileSystem fs, io.Directory delegate) : super(fs, delegate);
+  LocalDirectory(super.fs, super.delegate);
 
   @override
   String toString() => "LocalDirectory: '$path'";
diff --git a/pkgs/file/lib/src/backends/local/local_file.dart b/pkgs/file/lib/src/backends/local/local_file.dart
index 36293ba..a4bc106 100644
--- a/pkgs/file/lib/src/backends/local/local_file.dart
+++ b/pkgs/file/lib/src/backends/local/local_file.dart
@@ -2,9 +2,9 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/io.dart' as io;
-
+import '../../forwarding.dart';
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'local_file_system_entity.dart';
 
 /// [File] implementation that forwards all calls to `dart:io`.
@@ -12,7 +12,7 @@
     with ForwardingFile {
   /// Instantiates a new [LocalFile] tied to the specified file system
   /// and delegating to the specified [delegate].
-  LocalFile(FileSystem fs, io.File delegate) : super(fs, delegate);
+  LocalFile(super.fs, super.delegate);
 
   @override
   String toString() => "LocalFile: '$path'";
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 635998e..7541c37 100644
--- a/pkgs/file/lib/src/backends/local/local_file_system.dart
+++ b/pkgs/file/lib/src/backends/local/local_file_system.dart
@@ -2,10 +2,10 @@
 // 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 'package:file/src/io.dart' as io;
-import 'package:file/file.dart';
 import 'package:path/path.dart' as p;
 
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'local_directory.dart';
 import 'local_file.dart';
 import 'local_link.dart';
diff --git a/pkgs/file/lib/src/backends/local/local_file_system_entity.dart b/pkgs/file/lib/src/backends/local/local_file_system_entity.dart
index ca4617b..d0da559 100644
--- a/pkgs/file/lib/src/backends/local/local_file_system_entity.dart
+++ b/pkgs/file/lib/src/backends/local/local_file_system_entity.dart
@@ -2,9 +2,9 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/io.dart' as io;
-
+import '../../forwarding.dart';
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'local_directory.dart';
 import 'local_file.dart';
 import 'local_link.dart';
diff --git a/pkgs/file/lib/src/backends/local/local_link.dart b/pkgs/file/lib/src/backends/local/local_link.dart
index fc67d5e..2ce4791 100644
--- a/pkgs/file/lib/src/backends/local/local_link.dart
+++ b/pkgs/file/lib/src/backends/local/local_link.dart
@@ -2,9 +2,9 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/io.dart' as io;
-
+import '../../forwarding.dart';
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'local_file_system_entity.dart';
 
 /// [Link] implementation that forwards all calls to `dart:io`.
@@ -12,7 +12,7 @@
     with ForwardingLink {
   /// Instantiates a new [LocalLink] tied to the specified file system
   /// and delegating to the specified [delegate].
-  LocalLink(FileSystem fs, io.Link delegate) : super(fs, delegate);
+  LocalLink(super.fs, super.delegate);
 
   @override
   String toString() => "LocalLink: '$path'";
diff --git a/pkgs/file/lib/src/backends/memory/clock.dart b/pkgs/file/lib/src/backends/memory/clock.dart
index 98d5434..57c1b72 100644
--- a/pkgs/file/lib/src/backends/memory/clock.dart
+++ b/pkgs/file/lib/src/backends/memory/clock.dart
@@ -2,6 +2,8 @@
 // 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.
 
+// ignore_for_file: comment_references
+
 /// Interface describing clocks used by the [MemoryFileSystem].
 ///
 /// The [MemoryFileSystem] uses a clock to determine the modification times of
diff --git a/pkgs/file/lib/src/backends/memory/common.dart b/pkgs/file/lib/src/backends/memory/common.dart
index 80e3c38..eb4ca43 100644
--- a/pkgs/file/lib/src/backends/memory/common.dart
+++ b/pkgs/file/lib/src/backends/memory/common.dart
@@ -2,7 +2,7 @@
 // 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 'package:file/src/common.dart' as common;
+import '../../common.dart' as common;
 
 /// Generates a path to use in error messages.
 typedef PathGenerator = dynamic Function();
diff --git a/pkgs/file/lib/src/backends/memory/memory_directory.dart b/pkgs/file/lib/src/backends/memory/memory_directory.dart
index 95fe542..e73b967 100644
--- a/pkgs/file/lib/src/backends/memory/memory_directory.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_directory.dart
@@ -2,11 +2,11 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/common.dart' as common;
-import 'package:file/src/io.dart' as io;
 import 'package:meta/meta.dart';
 
+import '../../common.dart' as common;
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'common.dart';
 import 'memory_file.dart';
 import 'memory_file_system_entity.dart';
@@ -25,8 +25,7 @@
     with common.DirectoryAddOnsMixin
     implements Directory {
   /// Instantiates a new [MemoryDirectory].
-  MemoryDirectory(NodeBasedFileSystem fileSystem, String path)
-      : super(fileSystem, path);
+  MemoryDirectory(super.fileSystem, super.path);
 
   @override
   io.FileSystemEntityType get expectedType => io.FileSystemEntityType.directory;
@@ -52,7 +51,7 @@
   @override
   void createSync({bool recursive = false}) {
     fileSystem.opHandle(path, FileSystemOp.create);
-    Node? node = internalCreateSync(
+    var node = internalCreateSync(
       followTailLink: true,
       visitLinks: true,
       createChild: (DirectoryNode parent, bool isFinalSegment) {
@@ -75,19 +74,19 @@
   @override
   Directory createTempSync([String? prefix]) {
     prefix = '${prefix ?? ''}rand';
-    String fullPath = fileSystem.path.join(path, prefix);
-    String dirname = fileSystem.path.dirname(fullPath);
-    String basename = fileSystem.path.basename(fullPath);
-    DirectoryNode? node = fileSystem.findNode(dirname) as DirectoryNode?;
+    var fullPath = fileSystem.path.join(path, prefix);
+    var dirname = fileSystem.path.dirname(fullPath);
+    var basename = fileSystem.path.basename(fullPath);
+    var node = fileSystem.findNode(dirname) as DirectoryNode?;
     checkExists(node, () => dirname);
     utils.checkIsDir(node!, () => dirname);
-    int tempCounter = _systemTempCounter[fileSystem] ?? 0;
+    var tempCounter = _systemTempCounter[fileSystem] ?? 0;
     String name() => '$basename$tempCounter';
     while (node.children.containsKey(name())) {
       tempCounter++;
     }
     _systemTempCounter[fileSystem] = tempCounter;
-    DirectoryNode tempDir = DirectoryNode(node);
+    var tempDir = DirectoryNode(node);
     node.children[name()] = tempDir;
     return MemoryDirectory(fileSystem, fileSystem.path.join(dirname, name()))
       ..createSync();
@@ -128,9 +127,9 @@
     bool recursive = false,
     bool followLinks = true,
   }) {
-    DirectoryNode node = backing as DirectoryNode;
-    List<FileSystemEntity> listing = <FileSystemEntity>[];
-    List<_PendingListTask> tasks = <_PendingListTask>[
+    var node = backing as DirectoryNode;
+    var listing = <FileSystemEntity>[];
+    var tasks = <_PendingListTask>[
       _PendingListTask(
         node,
         path.endsWith(fileSystem.path.separator)
@@ -140,14 +139,14 @@
       ),
     ];
     while (tasks.isNotEmpty) {
-      _PendingListTask task = tasks.removeLast();
+      var task = tasks.removeLast();
       task.dir.children.forEach((String name, Node child) {
-        Set<LinkNode> breadcrumbs = Set<LinkNode>.from(task.breadcrumbs);
-        String childPath = fileSystem.path.join(task.path, name);
+        var breadcrumbs = Set<LinkNode>.from(task.breadcrumbs);
+        var childPath = fileSystem.path.join(task.path, name);
         while (followLinks &&
             utils.isLink(child) &&
             breadcrumbs.add(child as LinkNode)) {
-          Node? referent = child.referentOrNull;
+          var referent = child.referentOrNull;
           if (referent != null) {
             child = referent;
           }
diff --git a/pkgs/file/lib/src/backends/memory/memory_file.dart b/pkgs/file/lib/src/backends/memory/memory_file.dart
index ba4faab..1a8f5f9 100644
--- a/pkgs/file/lib/src/backends/memory/memory_file.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_file.dart
@@ -7,26 +7,25 @@
 import 'dart:math' as math show min;
 import 'dart:typed_data';
 
-import 'package:file/file.dart';
-import 'package:file/src/backends/memory/operations.dart';
-import 'package:file/src/common.dart' as common;
-import 'package:file/src/io.dart' as io;
 import 'package:meta/meta.dart';
 
+import '../../common.dart' as common;
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'common.dart';
 import 'memory_file_system_entity.dart';
 import 'memory_random_access_file.dart';
 import 'node.dart';
+import 'operations.dart';
 import 'utils.dart' as utils;
 
 /// Internal implementation of [File].
 class MemoryFile extends MemoryFileSystemEntity implements File {
   /// Instantiates a new [MemoryFile].
-  const MemoryFile(NodeBasedFileSystem fileSystem, String path)
-      : super(fileSystem, path);
+  const MemoryFile(super.fileSystem, super.path);
 
   FileNode get _resolvedBackingOrCreate {
-    Node? node = backingOrNull;
+    var node = backingOrNull;
     if (node == null) {
       node = _doCreate();
     } else {
@@ -61,7 +60,7 @@
   }
 
   Node? _doCreate({bool recursive = false}) {
-    Node? node = internalCreateSync(
+    var node = internalCreateSync(
       followTailLink: true,
       createChild: (DirectoryNode parent, bool isFinalSegment) {
         if (isFinalSegment) {
@@ -88,7 +87,7 @@
         newPath,
         followTailLink: true,
         checkType: (Node node) {
-          FileSystemEntityType actualType = node.stat.type;
+          var actualType = node.stat.type;
           if (actualType != expectedType) {
             throw actualType == FileSystemEntityType.notFound
                 ? common.noSuchFileOrDirectory(path)
@@ -103,7 +102,7 @@
   @override
   File copySync(String newPath) {
     fileSystem.opHandle(path, FileSystemOp.copy);
-    FileNode sourceNode = resolvedBacking as FileNode;
+    var sourceNode = resolvedBacking as FileNode;
     fileSystem.findNode(
       newPath,
       segmentVisitor: (
@@ -116,7 +115,7 @@
         if (currentSegment == finalSegment) {
           if (child != null) {
             if (utils.isLink(child)) {
-              List<String> ledger = <String>[];
+              var ledger = <String>[];
               child = utils.resolveLinks(child as LinkNode, () => newPath,
                   ledger: ledger);
               checkExists(child, () => newPath);
@@ -127,7 +126,7 @@
             utils.checkType(expectedType, child.type, () => newPath);
             parent.children.remove(childName);
           }
-          FileNode newNode = FileNode(parent);
+          var newNode = FileNode(parent);
           newNode.copyFrom(sourceNode);
           parent.children[childName] = newNode;
         }
@@ -158,7 +157,7 @@
 
   @override
   void setLastAccessedSync(DateTime time) {
-    FileNode node = resolvedBacking as FileNode;
+    var node = resolvedBacking as FileNode;
     node.accessed = time.millisecondsSinceEpoch;
   }
 
@@ -174,7 +173,7 @@
 
   @override
   void setLastModifiedSync(DateTime time) {
-    FileNode node = resolvedBacking as FileNode;
+    var node = resolvedBacking as FileNode;
     node.modified = time.millisecondsSinceEpoch;
   }
 
@@ -199,8 +198,8 @@
   Stream<List<int>> openRead([int? start, int? end]) {
     fileSystem.opHandle(path, FileSystemOp.open);
     try {
-      FileNode node = resolvedBacking as FileNode;
-      Uint8List content = node.content;
+      var node = resolvedBacking as FileNode;
+      var content = node.content;
       if (start != null) {
         content = end == null
             ? content.sublist(start)
@@ -253,13 +252,13 @@
 
   @override
   List<String> readAsLinesSync({Encoding encoding = utf8}) {
-    String str = readAsStringSync(encoding: encoding);
+    var str = readAsStringSync(encoding: encoding);
 
     if (str.isEmpty) {
       return <String>[];
     }
 
-    final List<String> lines = str.split('\n');
+    final lines = str.split('\n');
     if (str.endsWith('\n')) {
       // A final newline should not create an additional line.
       lines.removeLast();
@@ -287,7 +286,7 @@
     if (!utils.isWriteMode(mode)) {
       throw common.badFileDescriptor(path);
     }
-    FileNode node = _resolvedBackingOrCreate;
+    var node = _resolvedBackingOrCreate;
     _truncateIfNecessary(node, mode);
     fileSystem.opHandle(path, FileSystemOp.write);
     node.write(bytes);
@@ -349,7 +348,7 @@
       deferredException = e;
     }
 
-    Future<FileNode> future = Future<FileNode>.microtask(() {
+    var future = Future<FileNode>.microtask(() {
       if (deferredException != null) {
         throw deferredException;
       }
@@ -387,7 +386,7 @@
 
   @override
   void writeAll(Iterable<dynamic> objects, [String separator = '']) {
-    bool firstIter = true;
+    var firstIter = true;
     for (dynamic obj in objects) {
       if (!firstIter) {
         write(separator);
@@ -418,7 +417,7 @@
     _streamCompleter = Completer<void>();
 
     stream.listen(
-      (List<int> data) => _addData(data),
+      _addData,
       cancelOnError: true,
       onError: (Object error, StackTrace stackTrace) {
         _streamCompleter!.completeError(error, stackTrace);
@@ -445,8 +444,7 @@
       _isClosed = true;
       _pendingWrites.then(
         (_) => _completer.complete(),
-        onError: (Object error, StackTrace stackTrace) =>
-            _completer.completeError(error, stackTrace),
+        onError: _completer.completeError,
       );
     }
     return _completer.future;
diff --git a/pkgs/file/lib/src/backends/memory/memory_file_stat.dart b/pkgs/file/lib/src/backends/memory/memory_file_stat.dart
index 94f86d1..ce6beda 100644
--- a/pkgs/file/lib/src/backends/memory/memory_file_stat.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_file_stat.dart
@@ -2,7 +2,7 @@
 // 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 'package:file/src/io.dart' as io;
+import '../../io.dart' as io;
 
 /// Internal implementation of [io.FileStat].
 class MemoryFileStat implements io.FileStat {
@@ -47,8 +47,8 @@
 
   @override
   String modeString() {
-    int permissions = mode & 0xFFF;
-    List<String> codes = const <String>[
+    var permissions = mode & 0xFFF;
+    var codes = const <String>[
       '---',
       '--x',
       '-w-',
@@ -58,7 +58,7 @@
       'rw-',
       'rwx',
     ];
-    List<String> result = <String>[];
+    var result = <String>[];
     result
       ..add(codes[(permissions >> 6) & 0x7])
       ..add(codes[(permissions >> 3) & 0x7])
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 f3cdaee..dd359f0 100644
--- a/pkgs/file/lib/src/backends/memory/memory_file_system.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_file_system.dart
@@ -2,11 +2,10 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/backends/memory/operations.dart';
-import 'package:file/src/io.dart' as io;
 import 'package:path/path.dart' as p;
 
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'clock.dart';
 import 'common.dart';
 import 'memory_directory.dart';
@@ -14,6 +13,7 @@
 import 'memory_file_stat.dart';
 import 'memory_link.dart';
 import 'node.dart';
+import 'operations.dart';
 import 'style.dart';
 import 'utils.dart' as utils;
 
@@ -91,7 +91,7 @@
   p.Context _context;
 
   @override
-  final Function(String context, FileSystemOp operation) opHandle;
+  final void Function(String context, FileSystemOp operation) opHandle;
 
   @override
   final Clock clock;
@@ -141,7 +141,7 @@
     }
 
     value = directory(value).resolveSymbolicLinksSync();
-    Node? node = findNode(value);
+    var node = findNode(value);
     checkExists(node, () => value);
     utils.checkIsDir(node!, () => value);
     assert(_context.isAbsolute(value));
@@ -166,9 +166,9 @@
 
   @override
   bool identicalSync(String path1, String path2) {
-    Node? node1 = findNode(path1);
+    var node1 = findNode(path1);
     checkExists(node1, () => path1);
-    Node? node2 = findNode(path2);
+    var node2 = findNode(path2);
     checkExists(node2, () => path2);
     return node1 != null && node1 == node2;
   }
@@ -220,14 +220,13 @@
       reference ??= _current;
     }
 
-    List<String> parts = path.split(style.separator)
-      ..removeWhere(utils.isEmpty);
-    DirectoryNode? directory = reference?.directory;
+    var parts = path.split(style.separator)..removeWhere(utils.isEmpty);
+    var directory = reference?.directory;
     Node? child = directory;
 
-    int finalSegment = parts.length - 1;
-    for (int i = 0; i <= finalSegment; i++) {
-      String basename = parts[i];
+    var finalSegment = parts.length - 1;
+    for (var i = 0; i <= finalSegment; i++) {
+      var basename = parts[i];
       assert(basename.isNotEmpty);
 
       switch (basename) {
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 ad987d7..1990abc 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
@@ -2,11 +2,11 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/common.dart' as common;
-import 'package:file/src/io.dart' as io;
 import 'package:meta/meta.dart';
 
+import '../../common.dart' as common;
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'common.dart';
 import 'memory_directory.dart';
 import 'node.dart';
@@ -60,7 +60,7 @@
   /// The type of the node is not guaranteed to match [expectedType].
   @protected
   Node get backing {
-    Node? node = fileSystem.findNode(path);
+    var node = fileSystem.findNode(path);
     checkExists(node, () => path);
     return node!;
   }
@@ -71,7 +71,7 @@
   /// doesn't match, this will throw a [io.FileSystemException].
   @protected
   Node get resolvedBacking {
-    Node node = backing;
+    var node = backing;
     node = utils.isLink(node)
         ? utils.resolveLinks(node as LinkNode, () => path)
         : node;
@@ -107,14 +107,14 @@
     if (path.isEmpty) {
       throw common.noSuchFileOrDirectory(path);
     }
-    List<String> ledger = <String>[];
+    var ledger = <String>[];
     if (isAbsolute) {
       ledger.add(fileSystem.style.drive);
     }
-    Node? node = fileSystem.findNode(path,
+    var node = fileSystem.findNode(path,
         pathWithSymlinks: ledger, followTailLink: true);
     checkExists(node, () => path);
-    String resolved = ledger.join(fileSystem.path.separator);
+    var resolved = ledger.join(fileSystem.path.separator);
     if (resolved == fileSystem.style.drive) {
       resolved = fileSystem.style.root;
     } else if (!fileSystem.path.isAbsolute(resolved)) {
@@ -151,7 +151,7 @@
 
   @override
   FileSystemEntity get absolute {
-    String absolutePath = path;
+    var absolutePath = path;
     if (!fileSystem.path.isAbsolute(absolutePath)) {
       absolutePath = fileSystem.path.join(fileSystem.cwd, absolutePath);
     }
@@ -242,7 +242,7 @@
     bool followTailLink = false,
     utils.TypeChecker? checkType,
   }) {
-    Node node = backing;
+    var node = backing;
     (checkType ?? defaultCheckType)(node);
     fileSystem.findNode(
       newPath,
@@ -256,7 +256,7 @@
         if (currentSegment == finalSegment) {
           if (child != null) {
             if (followTailLink) {
-              FileSystemEntityType childType = child.stat.type;
+              var childType = child.stat.type;
               if (childType != FileSystemEntityType.notFound) {
                 utils.checkType(expectedType, child.stat.type, () => newPath);
               }
@@ -289,7 +289,7 @@
     utils.TypeChecker? checkType,
   }) {
     fileSystem.opHandle(path, FileSystemOp.delete);
-    Node node = backing;
+    var node = backing;
     if (!recursive) {
       if (node is DirectoryNode && node.children.isNotEmpty) {
         throw common.directoryNotEmpty(path);
diff --git a/pkgs/file/lib/src/backends/memory/memory_link.dart b/pkgs/file/lib/src/backends/memory/memory_link.dart
index 7d5afb4..a599fe8 100644
--- a/pkgs/file/lib/src/backends/memory/memory_link.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_link.dart
@@ -2,11 +2,11 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/common.dart' as common;
-import 'package:file/src/io.dart' as io;
 import 'package:meta/meta.dart';
 
+import '../../common.dart' as common;
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'memory_file_system_entity.dart';
 import 'node.dart';
 import 'operations.dart';
@@ -15,8 +15,7 @@
 /// Internal implementation of [Link].
 class MemoryLink extends MemoryFileSystemEntity implements Link {
   /// Instantiates a new [MemoryLink].
-  const MemoryLink(NodeBasedFileSystem fileSystem, String path)
-      : super(fileSystem, path);
+  const MemoryLink(super.fileSystem, super.path);
 
   @override
   io.FileSystemEntityType get expectedType => io.FileSystemEntityType.link;
@@ -50,7 +49,7 @@
 
   @override
   void createSync(String target, {bool recursive = false}) {
-    bool preexisting = true;
+    var preexisting = true;
     fileSystem.opHandle(path, FileSystemOp.create);
     internalCreateSync(
         createChild: (DirectoryNode parent, bool isFinalSegment) {
@@ -76,7 +75,7 @@
 
   @override
   void updateSync(String target) {
-    Node node = backing;
+    var node = backing;
     utils.checkType(expectedType, node.type, () => path);
     (node as LinkNode).target = target;
   }
@@ -93,7 +92,7 @@
 
   @override
   String targetSync() {
-    Node node = backing;
+    var node = backing;
     if (node.type != expectedType) {
       // Note: this may change; https://github.com/dart-lang/sdk/issues/28204
       throw common.noSuchFileOrDirectory(path);
diff --git a/pkgs/file/lib/src/backends/memory/memory_random_access_file.dart b/pkgs/file/lib/src/backends/memory/memory_random_access_file.dart
index d4fe73d..190f0a1 100644
--- a/pkgs/file/lib/src/backends/memory/memory_random_access_file.dart
+++ b/pkgs/file/lib/src/backends/memory/memory_random_access_file.dart
@@ -6,10 +6,11 @@
 import 'dart:math' as math show min;
 import 'dart:typed_data';
 
-import 'package:file/src/common.dart' as common;
-import 'package:file/src/io.dart' as io;
-
+import '../../common.dart' as common;
+import '../../io.dart' as io;
+import '../memory.dart' show MemoryFileSystem;
 import 'memory_file.dart';
+import 'memory_file_system.dart' show MemoryFileSystem;
 import 'node.dart';
 import 'utils.dart' as utils;
 
@@ -106,8 +107,8 @@
   /// Wraps a synchronous function to make it appear asynchronous.
   ///
   /// [_asyncOperationPending], [_checkAsync], and [_asyncWrapper] are used to
-  /// mimic [RandomAccessFile]'s enforcement that only one asynchronous
-  /// operation is pending for a [RandomAccessFile] instance.  Since
+  /// mimic [io.RandomAccessFile]'s enforcement that only one asynchronous
+  /// operation is pending for a [io.RandomAccessFile] instance.  Since
   /// [MemoryFileSystem]-based classes are likely to be used in tests, fidelity
   /// is important to catch errors that might occur in production.
   ///
@@ -211,7 +212,7 @@
     _checkReadable('read');
     // TODO(jamesderlin): Check for integer overflow.
     final int end = math.min(_position + bytes, lengthSync());
-    final Uint8List copy = _node.content.sublist(_position, end);
+    final copy = _node.content.sublist(_position, end);
     _position = end;
     return copy;
   }
@@ -243,7 +244,7 @@
 
     end = RangeError.checkValidRange(start, end, buffer.length);
 
-    final int length = lengthSync();
+    final length = lengthSync();
     int i;
     for (i = start; i < end && _position < length; i += 1, _position += 1) {
       buffer[i] = _node.content[_position];
@@ -288,7 +289,7 @@
           'truncate failed', path, common.invalidArgument(path).osError);
     }
 
-    final int oldLength = lengthSync();
+    final oldLength = lengthSync();
     if (length < oldLength) {
       _node.truncate(length);
 
@@ -329,7 +330,7 @@
     // [Uint8List] will truncate values to 8-bits automatically, so we don't
     // need to check [value].
 
-    int length = lengthSync();
+    var length = lengthSync();
     if (_position >= length) {
       // If [_position] is out of bounds, [RandomAccessFile] zero-fills the
       // file.
@@ -363,8 +364,8 @@
 
     end = RangeError.checkValidRange(start, end, buffer.length);
 
-    final int writeByteCount = end - start;
-    final int endPosition = _position + writeByteCount;
+    final writeByteCount = end - start;
+    final endPosition = _position + writeByteCount;
 
     if (endPosition > lengthSync()) {
       truncateSync(endPosition);
diff --git a/pkgs/file/lib/src/backends/memory/node.dart b/pkgs/file/lib/src/backends/memory/node.dart
index ae4d3f7..eea72b5 100644
--- a/pkgs/file/lib/src/backends/memory/node.dart
+++ b/pkgs/file/lib/src/backends/memory/node.dart
@@ -4,13 +4,12 @@
 
 import 'dart:typed_data';
 
-import 'package:file/file.dart';
-import 'package:file/src/backends/memory/operations.dart';
-import 'package:file/src/io.dart' as io;
-
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'clock.dart';
 import 'common.dart';
 import 'memory_file_stat.dart';
+import 'operations.dart';
 import 'style.dart';
 
 /// Visitor callback for use with [NodeBasedFileSystem.findNode].
@@ -115,7 +114,7 @@
 
   /// Reparents this node to live in the specified directory.
   set parent(DirectoryNode parent) {
-    DirectoryNode ancestor = parent;
+    var ancestor = parent;
     while (!ancestor.isRoot) {
       if (ancestor == this) {
         throw const io.FileSystemException(
@@ -149,8 +148,8 @@
 /// you call [stat] on them).
 abstract class RealNode extends Node {
   /// Constructs a new [RealNode] as a child of the specified [parent].
-  RealNode(DirectoryNode? parent) : super(parent) {
-    int now = clock.now.millisecondsSinceEpoch;
+  RealNode(super.parent) {
+    var now = clock.now.millisecondsSinceEpoch;
     changed = now;
     modified = now;
     accessed = now;
@@ -195,7 +194,7 @@
 /// Class that represents the backing for an in-memory directory.
 class DirectoryNode extends RealNode {
   /// Constructs a new [DirectoryNode] as a child of the specified [parent].
-  DirectoryNode(DirectoryNode? parent) : super(parent);
+  DirectoryNode(super.parent);
 
   /// Child nodes, indexed by their basename.
   final Map<String, Node> children = <String, Node>{};
@@ -237,7 +236,7 @@
 /// Class that represents the backing for an in-memory regular file.
 class FileNode extends RealNode {
   /// Constructs a new [FileNode] as a child of the specified [parent].
-  FileNode(DirectoryNode parent) : super(parent);
+  FileNode(DirectoryNode super.parent);
 
   /// File contents in bytes.
   Uint8List get content => _content;
@@ -251,7 +250,7 @@
 
   /// Appends the specified bytes to the end of this node's [content].
   void write(List<int> bytes) {
-    Uint8List existing = _content;
+    var existing = _content;
     _content = Uint8List(existing.length + bytes.length);
     _content.setRange(0, existing.length, existing);
     _content.setRange(existing.length, _content.length, bytes);
@@ -286,9 +285,7 @@
 class LinkNode extends Node {
   /// Constructs a new [LinkNode] as a child of the specified [parent] and
   /// linking to the specified [target] path.
-  LinkNode(DirectoryNode parent, this.target)
-      : assert(target.isNotEmpty),
-        super(parent);
+  LinkNode(DirectoryNode super.parent, this.target) : assert(target.isNotEmpty);
 
   /// The path to which this link points.
   String target;
@@ -309,7 +306,7 @@
     Node? Function(DirectoryNode parent, String childName, Node? child)?
         tailVisitor,
   }) {
-    Node? referent = fs.findNode(
+    var referent = fs.findNode(
       target,
       reference: this,
       segmentVisitor: (
@@ -349,7 +346,7 @@
     }
     _reentrant = true;
     try {
-      Node? node = referentOrNull;
+      var node = referentOrNull;
       return node == null ? MemoryFileStat.notFound : node.stat;
     } finally {
       _reentrant = false;
diff --git a/pkgs/file/lib/src/backends/memory/operations.dart b/pkgs/file/lib/src/backends/memory/operations.dart
index 9fc7462..57d118b 100644
--- a/pkgs/file/lib/src/backends/memory/operations.dart
+++ b/pkgs/file/lib/src/backends/memory/operations.dart
@@ -2,6 +2,8 @@
 // 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.
 
+// ignore_for_file: comment_references
+
 /// A file system operation used by the [MemoryFileSytem] to allow
 /// tests to insert errors for certain operations.
 ///
@@ -64,23 +66,15 @@
 
   @override
   String toString() {
-    switch (_value) {
-      case 0:
-        return 'FileSystemOp.read';
-      case 1:
-        return 'FileSystemOp.write';
-      case 2:
-        return 'FileSystemOp.delete';
-      case 3:
-        return 'FileSystemOp.create';
-      case 4:
-        return 'FileSystemOp.open';
-      case 5:
-        return 'FileSystemOp.copy';
-      case 6:
-        return 'FileSystemOp.exists';
-      default:
-        throw StateError('Invalid FileSytemOp type: $this');
-    }
+    return switch (_value) {
+      0 => 'FileSystemOp.read',
+      1 => 'FileSystemOp.write',
+      2 => 'FileSystemOp.delete',
+      3 => 'FileSystemOp.create',
+      4 => 'FileSystemOp.open',
+      5 => 'FileSystemOp.copy',
+      6 => 'FileSystemOp.exists',
+      _ => throw StateError('Invalid FileSytemOp type: $this')
+    };
   }
 }
diff --git a/pkgs/file/lib/src/backends/memory/style.dart b/pkgs/file/lib/src/backends/memory/style.dart
index 701c9d0..f4bd33f 100644
--- a/pkgs/file/lib/src/backends/memory/style.dart
+++ b/pkgs/file/lib/src/backends/memory/style.dart
@@ -2,9 +2,10 @@
 // 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 'package:file/file.dart';
 import 'package:path/path.dart' as p;
 
+import '../../interface.dart';
+
 /// Class that represents the path style that a memory file system should
 /// adopt.
 ///
diff --git a/pkgs/file/lib/src/backends/memory/utils.dart b/pkgs/file/lib/src/backends/memory/utils.dart
index eec9980..aa24cfb 100644
--- a/pkgs/file/lib/src/backends/memory/utils.dart
+++ b/pkgs/file/lib/src/backends/memory/utils.dart
@@ -2,20 +2,19 @@
 // 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 'package:file/file.dart';
-import 'package:file/src/common.dart' as common;
-import 'package:file/src/io.dart' as io;
-
+import '../../common.dart' as common;
+import '../../interface.dart';
+import '../../io.dart' as io;
 import 'common.dart';
 import 'node.dart';
 
-/// Checks if `node.type` returns [io.FileSystemEntityType.FILE].
+/// Checks if `node.type` returns [io.FileSystemEntityType.file].
 bool isFile(Node? node) => node?.type == io.FileSystemEntityType.file;
 
-/// Checks if `node.type` returns [io.FileSystemEntityType.DIRECTORY].
+/// Checks if `node.type` returns [io.FileSystemEntityType.directory].
 bool isDirectory(Node? node) => node?.type == io.FileSystemEntityType.directory;
 
-/// Checks if `node.type` returns [io.FileSystemEntityType.LINK].
+/// Checks if `node.type` returns [io.FileSystemEntityType.link].
 bool isLink(Node? node) => node?.type == io.FileSystemEntityType.link;
 
 /// Validator function that is expected to throw a [FileSystemException] if
@@ -86,7 +85,7 @@
       tailVisitor,
 }) {
   // Record a breadcrumb trail to guard against symlink loops.
-  Set<LinkNode> breadcrumbs = <LinkNode>{};
+  var breadcrumbs = <LinkNode>{};
 
   Node node = link;
   while (isLink(node)) {
diff --git a/pkgs/file/lib/src/forwarding/forwarding_directory.dart b/pkgs/file/lib/src/forwarding/forwarding_directory.dart
index dba0c8e..ad1c548 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_directory.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_directory.dart
@@ -2,8 +2,9 @@
 // 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 'package:file/src/io.dart' as io;
-import 'package:file/file.dart';
+import '../forwarding.dart';
+import '../interface.dart';
+import '../io.dart' as io;
 
 /// A directory that forwards all methods and properties to a delegate.
 mixin ForwardingDirectory<T extends Directory>
diff --git a/pkgs/file/lib/src/forwarding/forwarding_file.dart b/pkgs/file/lib/src/forwarding/forwarding_file.dart
index 49c211d..d6cfe3b 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_file.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_file.dart
@@ -5,8 +5,9 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:file/src/io.dart' as io;
-import 'package:file/file.dart';
+import '../forwarding.dart';
+import '../interface.dart';
+import '../io.dart' as io;
 
 /// A file that forwards all methods and properties to a delegate.
 mixin ForwardingFile
diff --git a/pkgs/file/lib/src/forwarding/forwarding_file_system.dart b/pkgs/file/lib/src/forwarding/forwarding_file_system.dart
index d864db9..885fdb6 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_file_system.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_file_system.dart
@@ -2,11 +2,12 @@
 // 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 'package:file/src/io.dart' as io;
-import 'package:file/file.dart';
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 
+import '../interface.dart';
+import '../io.dart' as io;
+
 /// A file system that forwards all methods and properties to a delegate.
 abstract class ForwardingFileSystem extends FileSystem {
   /// Creates a new [ForwardingFileSystem] that forwards all methods and
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 3c41b39..1c0628e 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_file_system_entity.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_file_system_entity.dart
@@ -2,10 +2,11 @@
 // 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 'package:file/src/io.dart' as io;
-import 'package:file/file.dart';
 import 'package:meta/meta.dart';
 
+import '../interface.dart';
+import '../io.dart' as io;
+
 /// A file system entity that forwards all methods and properties to a delegate.
 abstract class ForwardingFileSystemEntity<T extends FileSystemEntity,
     D extends io.FileSystemEntity> implements FileSystemEntity {
diff --git a/pkgs/file/lib/src/forwarding/forwarding_link.dart b/pkgs/file/lib/src/forwarding/forwarding_link.dart
index 7a60ecb..915e710 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_link.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_link.dart
@@ -2,8 +2,9 @@
 // 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 'package:file/src/io.dart' as io;
-import 'package:file/file.dart';
+import '../forwarding.dart';
+import '../interface.dart';
+import '../io.dart' as io;
 
 /// A link that forwards all methods and properties to a delegate.
 mixin ForwardingLink
diff --git a/pkgs/file/lib/src/forwarding/forwarding_random_access_file.dart b/pkgs/file/lib/src/forwarding/forwarding_random_access_file.dart
index 9dd4079..3847b91 100644
--- a/pkgs/file/lib/src/forwarding/forwarding_random_access_file.dart
+++ b/pkgs/file/lib/src/forwarding/forwarding_random_access_file.dart
@@ -5,11 +5,12 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:file/src/io.dart' as io;
 import 'package:meta/meta.dart';
 
-/// A [RandomAccessFile] implementation that forwards all methods and properties
-/// to a delegate.
+import '../io.dart' as io;
+
+/// A [io.RandomAccessFile] implementation that forwards all methods and
+/// properties to a delegate.
 mixin ForwardingRandomAccessFile implements io.RandomAccessFile {
   /// The entity to which this entity will forward all methods and properties.
   @protected
diff --git a/pkgs/file/lib/src/interface.dart b/pkgs/file/lib/src/interface.dart
index 4662e35..d9b7ed5 100644
--- a/pkgs/file/lib/src/interface.dart
+++ b/pkgs/file/lib/src/interface.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.
 
-library file.src.interface;
-
 export 'interface/directory.dart';
 export 'interface/error_codes.dart';
 export 'interface/file.dart';
diff --git a/pkgs/file/lib/src/interface/error_codes.dart b/pkgs/file/lib/src/interface/error_codes.dart
index 8943538..4836b56 100644
--- a/pkgs/file/lib/src/interface/error_codes.dart
+++ b/pkgs/file/lib/src/interface/error_codes.dart
@@ -168,7 +168,7 @@
   static int get EXDEV => _platform((_Codes codes) => codes.exdev);
 
   static int _platform(int Function(_Codes codes) getCode) {
-    _Codes codes = (_platforms[operatingSystem] ?? _platforms['linux'])!;
+    var codes = (_platforms[operatingSystem] ?? _platforms['linux'])!;
     return getCode(codes);
   }
 }
diff --git a/pkgs/file/lib/src/interface/file_system.dart b/pkgs/file/lib/src/interface/file_system.dart
index ecc01a8..2d4e4aa 100644
--- a/pkgs/file/lib/src/interface/file_system.dart
+++ b/pkgs/file/lib/src/interface/file_system.dart
@@ -6,7 +6,6 @@
 import 'package:path/path.dart' as p;
 
 import '../io.dart' as io;
-
 import 'directory.dart';
 import 'file.dart';
 import 'file_system_entity.dart';
@@ -99,9 +98,9 @@
   bool get isWatchSupported;
 
   /// Finds the type of file system object that a [path] points to. Returns
-  /// a Future<FileSystemEntityType> that completes with the result.
+  /// a `Future<FileSystemEntityType>` that completes with the result.
   ///
-  /// [io.FileSystemEntityType.LINK] will only be returned if [followLinks] is
+  /// [io.FileSystemEntityType.link] will only be returned if [followLinks] is
   /// `false`, and [path] points to a link
   ///
   /// If the [path] does not point to a file system object or an error occurs
@@ -111,37 +110,38 @@
   /// Syncronously finds the type of file system object that a [path] points
   /// to. Returns a [io.FileSystemEntityType].
   ///
-  /// [io.FileSystemEntityType.LINK] will only be returned if [followLinks] is
+  /// [io.FileSystemEntityType.link] will only be returned if [followLinks] is
   /// `false`, and [path] points to a link
   ///
   /// If the [path] does not point to a file system object or an error occurs
   /// then [io.FileSystemEntityType.notFound] is returned.
   io.FileSystemEntityType typeSync(String path, {bool followLinks = true});
 
-  /// Checks if [`type(path)`](type) returns [io.FileSystemEntityType.FILE].
+  /// Checks if [`type(path)`](type) returns [io.FileSystemEntityType.file].
   Future<bool> isFile(String path) async =>
       await type(path) == io.FileSystemEntityType.file;
 
   /// Synchronously checks if [`type(path)`](type) returns
-  /// [io.FileSystemEntityType.FILE].
+  /// [io.FileSystemEntityType.file].
   bool isFileSync(String path) =>
       typeSync(path) == io.FileSystemEntityType.file;
 
-  /// Checks if [`type(path)`](type) returns [io.FileSystemEntityType.DIRECTORY].
+  /// Checks if [`type(path)`](type) returns
+  /// [io.FileSystemEntityType.directory].
   Future<bool> isDirectory(String path) async =>
       await type(path) == io.FileSystemEntityType.directory;
 
   /// Synchronously checks if [`type(path)`](type) returns
-  /// [io.FileSystemEntityType.DIRECTORY].
+  /// [io.FileSystemEntityType.directory].
   bool isDirectorySync(String path) =>
       typeSync(path) == io.FileSystemEntityType.directory;
 
-  /// Checks if [`type(path)`](type) returns [io.FileSystemEntityType.LINK].
+  /// Checks if [`type(path)`](type) returns [io.FileSystemEntityType.link].
   Future<bool> isLink(String path) async =>
       await type(path, followLinks: false) == io.FileSystemEntityType.link;
 
   /// Synchronously checks if [`type(path)`](type) returns
-  /// [io.FileSystemEntityType.LINK].
+  /// [io.FileSystemEntityType.link].
   bool isLinkSync(String path) =>
       typeSync(path, followLinks: false) == io.FileSystemEntityType.link;
 
diff --git a/pkgs/file/lib/src/io.dart b/pkgs/file/lib/src/io.dart
index 9d57e78..28c1d6d 100644
--- a/pkgs/file/lib/src/io.dart
+++ b/pkgs/file/lib/src/io.dart
@@ -8,6 +8,8 @@
 /// the `file` package. The `file` package re-exports these interfaces (or in
 /// some cases, implementations of these interfaces by the same name), so this
 /// file need not be exposes publicly and exists for internal use only.
+library;
+
 export 'dart:io'
     show
         Directory,
diff --git a/pkgs/file/pubspec.yaml b/pkgs/file/pubspec.yaml
index 5de5d37..0ad65b0 100644
--- a/pkgs/file/pubspec.yaml
+++ b/pkgs/file/pubspec.yaml
@@ -1,5 +1,5 @@
 name: file
-version: 7.0.1
+version: 7.0.2-wip
 description: A pluggable, mockable file system abstraction for Dart.
 repository: https://github.com/dart-lang/tools/tree/main/pkgs/file
 issue_tracker: https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Afile
@@ -12,6 +12,10 @@
   path: ^1.8.3
 
 dev_dependencies:
+  dart_flutter_team_lints: ^3.0.0
   file_testing: ^3.0.0
-  lints: ^2.0.1
   test: ^1.23.1
+
+dependency_overrides:
+  file_testing:
+    path: ../file_testing
diff --git a/pkgs/file/test/chroot_test.dart b/pkgs/file/test/chroot_test.dart
index 6c34ff2..cf23f47 100644
--- a/pkgs/file/test/chroot_test.dart
+++ b/pkgs/file/test/chroot_test.dart
@@ -3,6 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @TestOn('vm')
+library;
+
 import 'dart:io' as io;
 
 import 'package:file/chroot.dart';
@@ -17,14 +19,15 @@
 void main() {
   group('ChrootFileSystem', () {
     ChrootFileSystem createMemoryBackedChrootFileSystem() {
-      MemoryFileSystem fs = MemoryFileSystem();
+      var fs = MemoryFileSystem();
       fs.directory('/tmp').createSync();
       return ChrootFileSystem(fs, '/tmp');
     }
 
     // TODO(jamesderlin): Make ChrootFile.openSync return a delegating
     // RandomAccessFile that uses the chroot'd path.
-    List<String> skipCommon = <String>[
+    var skipCommon = <String>[
+      // ignore: lines_longer_than_80_chars
       'File > open > .* > RandomAccessFile > read > openReadHandleDoesNotChange',
       'File > open > .* > RandomAccessFile > openWriteHandleDoesNotChange',
     ];
@@ -137,6 +140,7 @@
           test('referencesRootEntityForJailbreakPath', () {
             mem.file('/foo').createSync();
             dynamic f = fs.file('../foo');
+            // ignore: avoid_dynamic_calls
             expect(f.delegate.path, '/tmp/foo');
           });
         });
@@ -151,7 +155,7 @@
 
         group('copy', () {
           test('copiesToRootDirectoryIfDestinationIsJailbreakPath', () {
-            File f = fs.file('/foo')..createSync();
+            var f = fs.file('/foo')..createSync();
             f.copySync('../bar');
             expect(mem.file('/bar'), isNot(exists));
             expect(mem.file('/tmp/bar'), exists);
diff --git a/pkgs/file/test/common_tests.dart b/pkgs/file/test/common_tests.dart
index 6028c77..491d4f9 100644
--- a/pkgs/file/test/common_tests.dart
+++ b/pkgs/file/test/common_tests.dart
@@ -3,6 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @TestOn('vm')
+library;
+
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io' as io;
@@ -10,8 +12,8 @@
 import 'package:file/file.dart';
 import 'package:file_testing/file_testing.dart';
 import 'package:path/path.dart' as p;
-import 'package:test/test.dart';
 import 'package:test/test.dart' as testpkg show group, setUp, tearDown, test;
+import 'package:test/test.dart';
 
 import 'utils.dart';
 
@@ -54,7 +56,7 @@
   List<String> skip = const <String>[],
   FileSystemGenerator? replay,
 }) {
-  RootPathGenerator? rootfn = root;
+  var rootfn = root;
 
   group('common', () {
     late FileSystemGenerator createFs;
@@ -62,7 +64,7 @@
     late List<SetUpTearDown> tearDowns;
     late FileSystem fs;
     late String root;
-    List<String> stack = <String>[];
+    var stack = <String>[];
 
     void skipIfNecessary(String description, void Function() callback) {
       stack.add(description);
@@ -105,7 +107,7 @@
               testpkg.setUp(() async {
                 await Future.forEach(setUps, (SetUpTearDown setUp) => setUp());
                 await body();
-                for (SetUpTearDown tearDown in tearDowns) {
+                for (var tearDown in tearDowns) {
                   await tearDown();
                 }
                 createFs = replay;
@@ -115,7 +117,7 @@
               testpkg.test(description, body, skip: skip);
 
               testpkg.tearDown(() async {
-                for (SetUpTearDown tearDown in tearDowns) {
+                for (var tearDown in tearDowns) {
                   await tearDown();
                 }
               });
@@ -126,13 +128,13 @@
     /// Returns [path] prefixed by the [root] namespace.
     /// This is only intended for absolute paths.
     String ns(String path) {
-      p.Context posix = p.Context(style: p.Style.posix);
-      List<String> parts = posix.split(path);
+      var posix = p.Context(style: p.Style.posix);
+      var parts = posix.split(path);
       parts[0] = root;
       path = fs.path.joinAll(parts);
-      String rootPrefix = fs.path.rootPrefix(path);
+      var rootPrefix = fs.path.rootPrefix(path);
       assert(rootPrefix.isNotEmpty);
-      String result = root == rootPrefix
+      var result = root == rootPrefix
           ? path
           : (path == rootPrefix
               ? root
@@ -160,7 +162,7 @@
 
         test('succeedsWithUriArgument', () {
           fs.directory(ns('/foo')).createSync();
-          Uri uri = fs.path.toUri(ns('/foo'));
+          var uri = fs.path.toUri(ns('/foo'));
           expect(fs.directory(uri), exists);
         });
 
@@ -173,11 +175,11 @@
         });
 
         // Fails due to
-        // https://github.com/google/file.dart/issues/112
+        // https://github.com/dart-lang/tools/issues/632
         test('considersBothSlashesEquivalent', () {
           fs.directory(r'foo\bar_dir').createSync(recursive: true);
           expect(fs.directory(r'foo/bar_dir'), exists);
-        }, skip: 'Fails due to https://github.com/google/file.dart/issues/112');
+        }, skip: 'Fails due to https://github.com/dart-lang/tools/issues/632');
       });
 
       group('file', () {
@@ -191,7 +193,7 @@
 
         test('succeedsWithUriArgument', () {
           fs.file(ns('/foo')).createSync();
-          Uri uri = fs.path.toUri(ns('/foo'));
+          var uri = fs.path.toUri(ns('/foo'));
           expect(fs.file(uri), exists);
         });
 
@@ -204,11 +206,11 @@
         });
 
         // Fails due to
-        // https://github.com/google/file.dart/issues/112
+        // https://github.com/dart-lang/tools/issues/632
         test('considersBothSlashesEquivalent', () {
           fs.file(r'foo\bar_file').createSync(recursive: true);
           expect(fs.file(r'foo/bar_file'), exists);
-        }, skip: 'Fails due to https://github.com/google/file.dart/issues/112');
+        }, skip: 'Fails due to https://github.com/dart-lang/tools/issues/632');
       });
 
       group('link', () {
@@ -223,7 +225,7 @@
         test('succeedsWithUriArgument', () {
           fs.file(ns('/foo')).createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          Uri uri = fs.path.toUri(ns('/bar'));
+          var uri = fs.path.toUri(ns('/bar'));
           expect(fs.link(uri), exists);
         });
 
@@ -248,7 +250,7 @@
 
       group('systemTempDirectory', () {
         test('existsAsDirectory', () {
-          Directory tmp = fs.systemTempDirectory;
+          var tmp = fs.systemTempDirectory;
           expect(tmp, isDirectory);
           expect(tmp, exists);
         });
@@ -318,7 +320,7 @@
         test('staysAtRootIfSetToParentOfRoot', () {
           fs.currentDirectory =
               List<String>.filled(20, '..').join(fs.path.separator);
-          String cwd = fs.currentDirectory.path;
+          var cwd = fs.currentDirectory.path;
           expect(cwd, fs.path.rootPrefix(cwd));
         });
 
@@ -371,36 +373,36 @@
 
       group('stat', () {
         test('isNotFoundForEmptyPath', () {
-          FileStat stat = fs.statSync('');
+          var stat = fs.statSync('');
           expect(stat.type, FileSystemEntityType.notFound);
         });
 
         test('isNotFoundForPathToNonExistentEntityAtTail', () {
-          FileStat stat = fs.statSync(ns('/foo'));
+          var stat = fs.statSync(ns('/foo'));
           expect(stat.type, FileSystemEntityType.notFound);
         });
 
         test('isNotFoundForPathToNonExistentEntityInTraversal', () {
-          FileStat stat = fs.statSync(ns('/foo/bar'));
+          var stat = fs.statSync(ns('/foo/bar'));
           expect(stat.type, FileSystemEntityType.notFound);
         });
 
         test('isDirectoryForDirectory', () {
           fs.directory(ns('/foo')).createSync();
-          FileStat stat = fs.statSync(ns('/foo'));
+          var stat = fs.statSync(ns('/foo'));
           expect(stat.type, FileSystemEntityType.directory);
         });
 
         test('isFileForFile', () {
           fs.file(ns('/foo')).createSync();
-          FileStat stat = fs.statSync(ns('/foo'));
+          var stat = fs.statSync(ns('/foo'));
           expect(stat.type, FileSystemEntityType.file);
         });
 
         test('isFileForLinkToFile', () {
           fs.file(ns('/foo')).createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          FileStat stat = fs.statSync(ns('/bar'));
+          var stat = fs.statSync(ns('/bar'));
           expect(stat.type, FileSystemEntityType.file);
         });
 
@@ -408,7 +410,7 @@
           fs.link(ns('/foo')).createSync(ns('/bar'));
           fs.link(ns('/bar')).createSync(ns('/baz'));
           fs.link(ns('/baz')).createSync(ns('/foo'));
-          FileStat stat = fs.statSync(ns('/foo'));
+          var stat = fs.statSync(ns('/foo'));
           expect(stat.type, FileSystemEntityType.notFound);
         });
       });
@@ -454,18 +456,18 @@
       group('type', () {
         test('isFileForFile', () {
           fs.file(ns('/foo')).createSync();
-          FileSystemEntityType type = fs.typeSync(ns('/foo'));
+          var type = fs.typeSync(ns('/foo'));
           expect(type, FileSystemEntityType.file);
         });
 
         test('isDirectoryForDirectory', () {
           fs.directory(ns('/foo')).createSync();
-          FileSystemEntityType type = fs.typeSync(ns('/foo'));
+          var type = fs.typeSync(ns('/foo'));
           expect(type, FileSystemEntityType.directory);
         });
 
         test('isDirectoryForAncestorOfRoot', () {
-          FileSystemEntityType type = fs
+          var type = fs
               .typeSync(List<String>.filled(20, '..').join(fs.path.separator));
           expect(type, FileSystemEntityType.directory);
         });
@@ -473,15 +475,14 @@
         test('isFileForLinkToFileAndFollowLinksTrue', () {
           fs.file(ns('/foo')).createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          FileSystemEntityType type = fs.typeSync(ns('/bar'));
+          var type = fs.typeSync(ns('/bar'));
           expect(type, FileSystemEntityType.file);
         });
 
         test('isLinkForLinkToFileAndFollowLinksFalse', () {
           fs.file(ns('/foo')).createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          FileSystemEntityType type =
-              fs.typeSync(ns('/bar'), followLinks: false);
+          var type = fs.typeSync(ns('/bar'), followLinks: false);
           expect(type, FileSystemEntityType.link);
         });
 
@@ -489,17 +490,17 @@
           fs.link(ns('/foo')).createSync(ns('/bar'));
           fs.link(ns('/bar')).createSync(ns('/baz'));
           fs.link(ns('/baz')).createSync(ns('/foo'));
-          FileSystemEntityType type = fs.typeSync(ns('/foo'));
+          var type = fs.typeSync(ns('/foo'));
           expect(type, FileSystemEntityType.notFound);
         });
 
         test('isNotFoundForNoEntityAtTail', () {
-          FileSystemEntityType type = fs.typeSync(ns('/foo'));
+          var type = fs.typeSync(ns('/foo'));
           expect(type, FileSystemEntityType.notFound);
         });
 
         test('isNotFoundForNoDirectoryInTraversal', () {
-          FileSystemEntityType type = fs.typeSync(ns('/foo/bar/baz'));
+          var type = fs.typeSync(ns('/foo/bar/baz'));
           expect(type, FileSystemEntityType.notFound);
         });
       });
@@ -676,8 +677,8 @@
         });
 
         test('succeedsIfDestinationDoesntExist', () {
-          Directory src = fs.directory(ns('/foo'))..createSync();
-          Directory dest = src.renameSync(ns('/bar'));
+          var src = fs.directory(ns('/foo'))..createSync();
+          var dest = src.renameSync(ns('/bar'));
           expect(dest.path, ns('/bar'));
           expect(dest, exists);
         });
@@ -686,8 +687,8 @@
           'succeedsIfDestinationIsEmptyDirectory',
           () {
             fs.directory(ns('/bar')).createSync();
-            Directory src = fs.directory(ns('/foo'))..createSync();
-            Directory dest = src.renameSync(ns('/bar'));
+            var src = fs.directory(ns('/foo'))..createSync();
+            var dest = src.renameSync(ns('/bar'));
             expect(src, isNot(exists));
             expect(dest, exists);
           },
@@ -697,14 +698,14 @@
 
         test('throwsIfDestinationIsFile', () {
           fs.file(ns('/bar')).createSync();
-          Directory src = fs.directory(ns('/foo'))..createSync();
+          var src = fs.directory(ns('/foo'))..createSync();
           expectFileSystemException(ErrorCodes.ENOTDIR, () {
             src.renameSync(ns('/bar'));
           });
         });
 
         test('throwsIfDestinationParentFolderDoesntExist', () {
-          Directory src = fs.directory(ns('/foo'))..createSync();
+          var src = fs.directory(ns('/foo'))..createSync();
           expectFileSystemException(ErrorCodes.ENOENT, () {
             src.renameSync(ns('/bar/baz'));
           });
@@ -712,7 +713,7 @@
 
         test('throwsIfDestinationIsNonEmptyDirectory', () {
           fs.file(ns('/bar/baz')).createSync(recursive: true);
-          Directory src = fs.directory(ns('/foo'))..createSync();
+          var src = fs.directory(ns('/foo'))..createSync();
           // The error will be 'Directory not empty' on OS X, but it will be
           // 'File exists' on Linux.
           expectFileSystemException(
@@ -749,7 +750,7 @@
         });
 
         test('throwsIfDestinationIsLinkToNotFound', () {
-          Directory src = fs.directory(ns('/foo'))..createSync();
+          var src = fs.directory(ns('/foo'))..createSync();
           fs.link(ns('/bar')).createSync(ns('/baz'));
           expectFileSystemException(ErrorCodes.ENOTDIR, () {
             src.renameSync(ns('/bar'));
@@ -757,7 +758,7 @@
         });
 
         test('throwsIfDestinationIsLinkToEmptyDirectory', () {
-          Directory src = fs.directory(ns('/foo'))..createSync();
+          var src = fs.directory(ns('/foo'))..createSync();
           fs.directory(ns('/bar')).createSync();
           fs.link(ns('/baz')).createSync(ns('/bar'));
           expectFileSystemException(ErrorCodes.ENOTDIR, () {
@@ -766,7 +767,7 @@
         });
 
         test('succeedsIfDestinationIsInDifferentDirectory', () {
-          Directory src = fs.directory(ns('/foo'))..createSync();
+          var src = fs.directory(ns('/foo'))..createSync();
           fs.directory(ns('/bar')).createSync();
           src.renameSync(ns('/bar/baz'));
           expect(fs.typeSync(ns('/foo')), FileSystemEntityType.notFound);
@@ -790,24 +791,24 @@
 
       group('delete', () {
         test('returnsCovariantType', () async {
-          Directory dir = fs.directory(ns('/foo'))..createSync();
+          var dir = fs.directory(ns('/foo'))..createSync();
           expect(await dir.delete(), isDirectory);
         });
 
         test('succeedsIfEmptyDirectoryExistsAndRecursiveFalse', () {
-          Directory dir = fs.directory(ns('/foo'))..createSync();
+          var dir = fs.directory(ns('/foo'))..createSync();
           dir.deleteSync();
           expect(dir, isNot(exists));
         });
 
         test('succeedsIfEmptyDirectoryExistsAndRecursiveTrue', () {
-          Directory dir = fs.directory(ns('/foo'))..createSync();
+          var dir = fs.directory(ns('/foo'))..createSync();
           dir.deleteSync(recursive: true);
           expect(dir, isNot(exists));
         });
 
         test('throwsIfNonEmptyDirectoryExistsAndRecursiveFalse', () {
-          Directory dir = fs.directory(ns('/foo'))..createSync();
+          var dir = fs.directory(ns('/foo'))..createSync();
           fs.file(ns('/foo/bar')).createSync();
           expectFileSystemException(ErrorCodes.ENOTEMPTY, () {
             dir.deleteSync();
@@ -815,7 +816,7 @@
         });
 
         test('succeedsIfNonEmptyDirectoryExistsAndRecursiveTrue', () {
-          Directory dir = fs.directory(ns('/foo'))..createSync();
+          var dir = fs.directory(ns('/foo'))..createSync();
           fs.file(ns('/foo/bar')).createSync();
           dir.deleteSync(recursive: true);
           expect(fs.directory(ns('/foo')), isNot(exists));
@@ -997,7 +998,7 @@
         test('handlesParentAndThisFolderReferences', () {
           fs.directory(ns('/foo/bar/baz')).createSync(recursive: true);
           fs.link(ns('/foo/bar/baz/qux')).createSync(fs.path.join('..', '..'));
-          String resolved = fs
+          var resolved = fs
               .directory(ns('/foo/./bar/baz/../baz/qux/bar'))
               .resolveSymbolicLinksSync();
           expect(resolved, ns('/foo/bar'));
@@ -1015,7 +1016,7 @@
               .createSync(fs.path.join('..', '..', 'qux'), recursive: true);
           fs.link(ns('/qux')).createSync('quux');
           fs.link(ns('/quux/quuz')).createSync(ns('/foo'), recursive: true);
-          String resolved = fs
+          var resolved = fs
               .directory(ns('/foo//bar/./baz/quuz/bar/..///bar/baz/'))
               .resolveSymbolicLinksSync();
           expect(resolved, ns('/quux'));
@@ -1069,29 +1070,29 @@
 
         test('resolvesNameCollisions', () {
           fs.directory(ns('/foo/bar')).createSync(recursive: true);
-          Directory tmp = fs.directory(ns('/foo')).createTempSync('bar');
+          var tmp = fs.directory(ns('/foo')).createTempSync('bar');
           expect(tmp.path,
               allOf(isNot(ns('/foo/bar')), startsWith(ns('/foo/bar'))));
         });
 
         test('succeedsWithoutPrefix', () {
-          Directory dir = fs.directory(ns('/foo'))..createSync();
+          var dir = fs.directory(ns('/foo'))..createSync();
           expect(dir.createTempSync().path, startsWith(ns('/foo/')));
         });
 
         test('succeedsWithPrefix', () {
-          Directory dir = fs.directory(ns('/foo'))..createSync();
+          var dir = fs.directory(ns('/foo'))..createSync();
           expect(dir.createTempSync('bar').path, startsWith(ns('/foo/bar')));
         });
 
         test('succeedsWithNestedPathPrefixThatExists', () {
           fs.directory(ns('/foo/bar')).createSync(recursive: true);
-          Directory tmp = fs.directory(ns('/foo')).createTempSync('bar/baz');
+          var tmp = fs.directory(ns('/foo')).createTempSync('bar/baz');
           expect(tmp.path, startsWith(ns('/foo/bar/baz')));
         });
 
         test('throwsWithNestedPathPrefixThatDoesntExist', () {
-          Directory dir = fs.directory(ns('/foo'))..createSync();
+          var dir = fs.directory(ns('/foo'))..createSync();
           expectFileSystemException(ErrorCodes.ENOENT, () {
             dir.createTempSync('bar/baz');
           });
@@ -1123,7 +1124,7 @@
         });
 
         test('returnsEmptyListForEmptyDirectory', () {
-          Directory empty = fs.directory(ns('/bar'))..createSync();
+          var empty = fs.directory(ns('/bar'))..createSync();
           expect(empty.listSync(), isEmpty);
         });
 
@@ -1134,7 +1135,7 @@
         });
 
         test('returnsLinkObjectsIfFollowLinksFalse', () {
-          List<FileSystemEntity> list = dir.listSync(followLinks: false);
+          var list = dir.listSync(followLinks: false);
           expect(list, hasLength(3));
           expect(list, contains(allOf(isFile, hasPath(ns('/foo/bar')))));
           expect(list, contains(allOf(isDirectory, hasPath(ns('/foo/baz')))));
@@ -1142,7 +1143,7 @@
         });
 
         test('followsLinksIfFollowLinksTrue', () {
-          List<FileSystemEntity> list = dir.listSync();
+          var list = dir.listSync();
           expect(list, hasLength(3));
           expect(list, contains(allOf(isFile, hasPath(ns('/foo/bar')))));
           expect(list, contains(allOf(isDirectory, hasPath(ns('/foo/baz')))));
@@ -1189,8 +1190,7 @@
         test('childEntriesNotNormalized', () {
           dir = fs.directory(ns('/bar/baz'))..createSync(recursive: true);
           fs.file(ns('/bar/baz/qux')).createSync();
-          List<FileSystemEntity> list =
-              fs.directory(ns('/bar//../bar/./baz')).listSync();
+          var list = fs.directory(ns('/bar//../bar/./baz')).listSync();
           expect(list, hasLength(1));
           expect(list[0], allOf(isFile, hasPath(ns('/bar//../bar/./baz/qux'))));
         });
@@ -1198,9 +1198,8 @@
         test('symlinksToNotFoundAlwaysReturnedAsLinks', () {
           dir = fs.directory(ns('/bar'))..createSync();
           fs.link(ns('/bar/baz')).createSync('qux');
-          for (bool followLinks in const <bool>[true, false]) {
-            List<FileSystemEntity> list =
-                dir.listSync(followLinks: followLinks);
+          for (var followLinks in const <bool>[true, false]) {
+            var list = dir.listSync(followLinks: followLinks);
             expect(list, hasLength(1));
             expect(list[0], allOf(isLink, hasPath(ns('/bar/baz'))));
           }
@@ -1208,7 +1207,7 @@
       });
 
       test('childEntities', () {
-        Directory dir = fs.directory(ns('/foo'))..createSync();
+        var dir = fs.directory(ns('/foo'))..createSync();
         dir.childDirectory('bar').createSync();
         dir.childFile('baz').createSync();
         dir.childLink('qux').createSync('bar');
@@ -1321,22 +1320,22 @@
         });
 
         test('succeedsIfDestinationDoesntExistAtTail', () {
-          File src = fs.file(ns('/foo'))..createSync();
-          File dest = src.renameSync(ns('/bar'));
+          var src = fs.file(ns('/foo'))..createSync();
+          var dest = src.renameSync(ns('/bar'));
           expect(fs.file(ns('/foo')), isNot(exists));
           expect(fs.file(ns('/bar')), exists);
           expect(dest.path, ns('/bar'));
         });
 
         test('throwsIfDestinationDoesntExistViaTraversal', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expectFileSystemException(ErrorCodes.ENOENT, () {
             f.renameSync(ns('/bar/baz'));
           });
         });
 
         test('succeedsIfDestinationExistsAsFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.file(ns('/bar')).createSync();
           f.renameSync(ns('/bar'));
           expect(fs.file(ns('/foo')), isNot(exists));
@@ -1344,7 +1343,7 @@
         });
 
         test('throwsIfDestinationExistsAsDirectory', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.directory(ns('/bar')).createSync();
           expectFileSystemException(ErrorCodes.EISDIR, () {
             f.renameSync(ns('/bar'));
@@ -1352,7 +1351,7 @@
         });
 
         test('succeedsIfDestinationExistsAsLinkToFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.file(ns('/bar')).createSync();
           fs.link(ns('/baz')).createSync(ns('/bar'));
           f.renameSync(ns('/baz'));
@@ -1364,7 +1363,7 @@
         });
 
         test('throwsIfDestinationExistsAsLinkToDirectory', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.directory(ns('/bar')).createSync();
           fs.link(ns('/baz')).createSync(ns('/bar'));
           expectFileSystemException(ErrorCodes.EISDIR, () {
@@ -1373,7 +1372,7 @@
         });
 
         test('succeedsIfDestinationExistsAsLinkToNotFound', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.link(ns('/bar')).createSync(ns('/baz'));
           f.renameSync(ns('/bar'));
           expect(fs.typeSync(ns('/foo')), FileSystemEntityType.notFound);
@@ -1429,7 +1428,7 @@
         });
 
         test('succeedsIfDestinationDoesntExistAtTail', () {
-          File f = fs.file(ns('/foo'))
+          var f = fs.file(ns('/foo'))
             ..createSync()
             ..writeAsStringSync('foo');
           f.copySync(ns('/bar'));
@@ -1439,14 +1438,14 @@
         });
 
         test('throwsIfDestinationDoesntExistViaTraversal', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expectFileSystemException(ErrorCodes.ENOENT, () {
             f.copySync(ns('/bar/baz'));
           });
         });
 
         test('succeedsIfDestinationExistsAsFile', () {
-          File f = fs.file(ns('/foo'))
+          var f = fs.file(ns('/foo'))
             ..createSync()
             ..writeAsStringSync('foo');
           fs.file(ns('/bar'))
@@ -1460,7 +1459,7 @@
         });
 
         test('throwsIfDestinationExistsAsDirectory', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.directory(ns('/bar')).createSync();
           expectFileSystemException(ErrorCodes.EISDIR, () {
             f.copySync(ns('/bar'));
@@ -1468,7 +1467,7 @@
         });
 
         test('succeedsIfDestinationExistsAsLinkToFile', () {
-          File f = fs.file(ns('/foo'))
+          var f = fs.file(ns('/foo'))
             ..createSync()
             ..writeAsStringSync('foo');
           fs.file(ns('/bar'))
@@ -1487,7 +1486,7 @@
         }, skip: io.Platform.isWindows /* No links on Windows */);
 
         test('throwsIfDestinationExistsAsLinkToDirectory', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.directory(ns('/bar')).createSync();
           fs.link(ns('/baz')).createSync(ns('/bar'));
           expectFileSystemException(ErrorCodes.EISDIR, () {
@@ -1525,7 +1524,7 @@
         });
 
         test('succeedsIfDestinationIsInDifferentDirectoryThanSource', () {
-          File f = fs.file(ns('/foo/bar'))
+          var f = fs.file(ns('/foo/bar'))
             ..createSync(recursive: true)
             ..writeAsStringSync('foo');
           fs.directory(ns('/baz')).createSync();
@@ -1587,12 +1586,12 @@
         });
 
         test('returnsZeroForNewlyCreatedFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expect(f.lengthSync(), 0);
         });
 
         test('writeNBytesReturnsLengthN', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsBytesSync(<int>[1, 2, 3, 4], flush: true);
           expect(f.lengthSync(), 4);
         });
@@ -1616,10 +1615,10 @@
 
       group('lastAccessed', () {
         test('isNowForNewlyCreatedFile', () {
-          DateTime before = downstairs();
-          File f = fs.file(ns('/foo'))..createSync();
-          DateTime after = ceil();
-          DateTime accessed = f.lastAccessedSync();
+          var before = downstairs();
+          var f = fs.file(ns('/foo'))..createSync();
+          var after = ceil();
+          var accessed = f.lastAccessedSync();
           expect(accessed, isSameOrAfter(before));
           expect(accessed, isSameOrBefore(after));
         });
@@ -1638,18 +1637,18 @@
         });
 
         test('succeedsIfExistsAsLinkToFile', () {
-          DateTime before = downstairs();
+          var before = downstairs();
           fs.file(ns('/foo')).createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          DateTime after = ceil();
-          DateTime accessed = fs.file(ns('/bar')).lastAccessedSync();
+          var after = ceil();
+          var accessed = fs.file(ns('/bar')).lastAccessedSync();
           expect(accessed, isSameOrAfter(before));
           expect(accessed, isSameOrBefore(after));
         });
       });
 
       group('setLastAccessed', () {
-        final DateTime time = DateTime(1999);
+        final time = DateTime(1999);
 
         test('throwsIfDoesntExist', () {
           expectFileSystemException(ErrorCodes.ENOENT, () {
@@ -1665,13 +1664,13 @@
         });
 
         test('succeedsIfExistsAsFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.setLastAccessedSync(time);
           expect(fs.file(ns('/foo')).lastAccessedSync(), time);
         });
 
         test('succeedsIfExistsAsLinkToFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
           f.setLastAccessedSync(time);
           expect(fs.file(ns('/bar')).lastAccessedSync(), time);
@@ -1680,10 +1679,10 @@
 
       group('lastModified', () {
         test('isNowForNewlyCreatedFile', () {
-          DateTime before = downstairs();
-          File f = fs.file(ns('/foo'))..createSync();
-          DateTime after = ceil();
-          DateTime modified = f.lastModifiedSync();
+          var before = downstairs();
+          var f = fs.file(ns('/foo'))..createSync();
+          var after = ceil();
+          var modified = f.lastModifiedSync();
           expect(modified, isSameOrAfter(before));
           expect(modified, isSameOrBefore(after));
         });
@@ -1702,18 +1701,18 @@
         });
 
         test('succeedsIfExistsAsLinkToFile', () {
-          DateTime before = downstairs();
+          var before = downstairs();
           fs.file(ns('/foo')).createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          DateTime after = ceil();
-          DateTime modified = fs.file(ns('/bar')).lastModifiedSync();
+          var after = ceil();
+          var modified = fs.file(ns('/bar')).lastModifiedSync();
           expect(modified, isSameOrAfter(before));
           expect(modified, isSameOrBefore(after));
         });
       });
 
       group('setLastModified', () {
-        final DateTime time = DateTime(1999);
+        final time = DateTime(1999);
 
         test('throwsIfDoesntExist', () {
           expectFileSystemException(ErrorCodes.ENOENT, () {
@@ -1729,13 +1728,13 @@
         });
 
         test('succeedsIfExistsAsFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.setLastModifiedSync(time);
           expect(fs.file(ns('/foo')).lastModifiedSync(), time);
         });
 
         test('succeedsIfExistsAsLinkToFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
           f.setLastModifiedSync(time);
           expect(fs.file(ns('/bar')).lastModifiedSync(), time);
@@ -1752,7 +1751,7 @@
             });
           } else {
             test('createsFileIfDoesntExistAtTail', () {
-              RandomAccessFile raf = fs.file(ns('/bar')).openSync(mode: mode);
+              var raf = fs.file(ns('/bar')).openSync(mode: mode);
               raf.closeSync();
               expect(fs.file(ns('/bar')), exists);
             });
@@ -1877,39 +1876,39 @@
                 });
 
                 test('readIntoWithBufferLargerThanContent', () {
-                  List<int> buffer = List<int>.filled(1024, 0);
-                  int numRead = raf.readIntoSync(buffer);
+                  var buffer = List<int>.filled(1024, 0);
+                  var numRead = raf.readIntoSync(buffer);
                   expect(numRead, 21);
                   expect(utf8.decode(buffer.sublist(0, 21)),
                       'pre-existing content\n');
                 });
 
                 test('readIntoWithBufferSmallerThanContent', () {
-                  List<int> buffer = List<int>.filled(10, 0);
-                  int numRead = raf.readIntoSync(buffer);
+                  var buffer = List<int>.filled(10, 0);
+                  var numRead = raf.readIntoSync(buffer);
                   expect(numRead, 10);
                   expect(utf8.decode(buffer), 'pre-existi');
                 });
 
                 test('readIntoWithStart', () {
-                  List<int> buffer = List<int>.filled(10, 0);
-                  int numRead = raf.readIntoSync(buffer, 2);
+                  var buffer = List<int>.filled(10, 0);
+                  var numRead = raf.readIntoSync(buffer, 2);
                   expect(numRead, 8);
                   expect(utf8.decode(buffer.sublist(2)), 'pre-exis');
                 });
 
                 test('readIntoWithStartAndEnd', () {
-                  List<int> buffer = List<int>.filled(10, 0);
-                  int numRead = raf.readIntoSync(buffer, 2, 5);
+                  var buffer = List<int>.filled(10, 0);
+                  var numRead = raf.readIntoSync(buffer, 2, 5);
                   expect(numRead, 3);
                   expect(utf8.decode(buffer.sublist(2, 5)), 'pre');
                 });
 
                 test('openReadHandleDoesNotChange', () {
-                  final String initial = utf8.decode(raf.readSync(4));
+                  final initial = utf8.decode(raf.readSync(4));
                   expect(initial, 'pre-');
-                  final File newFile = f.renameSync(ns('/bar'));
-                  String rest = utf8.decode(raf.readSync(1024));
+                  final newFile = f.renameSync(ns('/bar'));
+                  var rest = utf8.decode(raf.readSync(1024));
                   expect(rest, 'existing content\n');
 
                   assert(newFile.path != f.path);
@@ -1942,13 +1941,13 @@
               });
             } else {
               test('lengthGrowsAsDataIsWritten', () {
-                int lengthBefore = f.lengthSync();
+                var lengthBefore = f.lengthSync();
                 raf.writeByteSync(0xFACE);
                 expect(raf.lengthSync(), lengthBefore + 1);
               });
 
               test('flush', () {
-                int lengthBefore = f.lengthSync();
+                var lengthBefore = f.lengthSync();
                 raf.writeByteSync(0xFACE);
                 raf.flushSync();
                 expect(f.lengthSync(), lengthBefore + 1);
@@ -2009,10 +2008,10 @@
 
               test('openWriteHandleDoesNotChange', () {
                 raf.writeStringSync('Hello ');
-                final File newFile = f.renameSync(ns('/bar'));
+                final newFile = f.renameSync(ns('/bar'));
                 raf.writeStringSync('world');
 
-                final String contents = newFile.readAsStringSync();
+                final contents = newFile.readAsStringSync();
                 if (mode == FileMode.write || mode == FileMode.writeOnly) {
                   expect(contents, 'Hello world');
                 } else {
@@ -2067,7 +2066,7 @@
                 });
               } else {
                 test('growsAfterWrite', () {
-                  int positionBefore = raf.positionSync();
+                  var positionBefore = raf.positionSync();
                   raf.writeStringSync('Hello world');
                   expect(raf.positionSync(), positionBefore + 11);
                 });
@@ -2165,42 +2164,42 @@
 
       group('openRead', () {
         test('throwsIfDoesntExist', () {
-          Stream<List<int>> stream = fs.file(ns('/foo')).openRead();
+          var stream = fs.file(ns('/foo')).openRead();
           expect(stream.drain<void>(),
               throwsFileSystemException(ErrorCodes.ENOENT));
         });
 
         test('succeedsIfExistsAsFile', () async {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello world', flush: true);
-          Stream<List<int>> stream = f.openRead();
-          List<List<int>> data = await stream.toList();
+          var stream = f.openRead();
+          var data = await stream.toList();
           expect(data, hasLength(1));
           expect(utf8.decode(data[0]), 'Hello world');
         });
 
         test('throwsIfExistsAsDirectory', () {
           fs.directory(ns('/foo')).createSync();
-          Stream<List<int>> stream = fs.file(ns('/foo')).openRead();
+          var stream = fs.file(ns('/foo')).openRead();
           expect(stream.drain<void>(),
               throwsFileSystemException(ErrorCodes.EISDIR));
         });
 
         test('succeedsIfExistsAsLinkToFile', () async {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
           f.writeAsStringSync('Hello world', flush: true);
-          Stream<List<int>> stream = fs.file(ns('/bar')).openRead();
-          List<List<int>> data = await stream.toList();
+          var stream = fs.file(ns('/bar')).openRead();
+          var data = await stream.toList();
           expect(data, hasLength(1));
           expect(utf8.decode(data[0]), 'Hello world');
         });
 
         test('respectsStartAndEndParameters', () async {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello world', flush: true);
-          Stream<List<int>> stream = f.openRead(2);
-          List<List<int>> data = await stream.toList();
+          var stream = f.openRead(2);
+          var data = await stream.toList();
           expect(data, hasLength(1));
           expect(utf8.decode(data[0]), 'llo world');
           stream = f.openRead(2, 5);
@@ -2210,24 +2209,24 @@
         });
 
         test('throwsIfStartParameterIsNegative', () async {
-          File f = fs.file(ns('/foo'))..createSync();
-          Stream<List<int>> stream = f.openRead(-2);
+          var f = fs.file(ns('/foo'))..createSync();
+          var stream = f.openRead(-2);
           expect(stream.drain<void>(), throwsRangeError);
         });
 
         test('stopsAtEndOfFileIfEndParameterIsPastEndOfFile', () async {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello world', flush: true);
-          Stream<List<int>> stream = f.openRead(2, 1024);
-          List<List<int>> data = await stream.toList();
+          var stream = f.openRead(2, 1024);
+          var data = await stream.toList();
           expect(data, hasLength(1));
           expect(utf8.decode(data[0]), 'llo world');
         });
 
         test('providesSingleSubscriptionStream', () async {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello world', flush: true);
-          Stream<List<int>> stream = f.openRead();
+          var stream = f.openRead();
           expect(stream.isBroadcast, isFalse);
           await stream.drain<void>();
         });
@@ -2237,20 +2236,20 @@
           // split across multiple chunks in the [Stream].  However, there
           // doesn't seem to be a good way to determine the chunk size used by
           // [io.File].
-          final List<int> data = List<int>.generate(
+          final data = List<int>.generate(
             1024 * 256,
             (int index) => index & 0xFF,
             growable: false,
           );
 
-          final File f = fs.file(ns('/foo'))..createSync();
+          final f = fs.file(ns('/foo'))..createSync();
 
           f.writeAsBytesSync(data, flush: true);
-          final Stream<List<int>> stream = f.openRead();
+          final stream = f.openRead();
 
           File? newFile;
           List<int>? initialChunk;
-          final List<int> remainingChunks = <int>[];
+          final remainingChunks = <int>[];
 
           await for (List<int> chunk in stream) {
             if (initialChunk == null) {
@@ -2276,7 +2275,7 @@
 
         test('openReadCompatibleWithUtf8Decoder', () async {
           const content = 'Hello world!';
-          File file = fs.file(ns('/foo'))
+          var file = fs.file(ns('/foo'))
             ..createSync()
             ..writeAsStringSync(content);
           expect(
@@ -2315,8 +2314,8 @@
         });
 
         test('succeedsIfExistsAsEmptyFile', () async {
-          File f = fs.file(ns('/foo'))..createSync();
-          IOSink sink = f.openWrite();
+          var f = fs.file(ns('/foo'))..createSync();
+          var sink = f.openWrite();
           sink.write('Hello world');
           await sink.flush();
           await sink.close();
@@ -2326,7 +2325,7 @@
         test('succeedsIfExistsAsLinkToFile', () async {
           fs.file(ns('/foo')).createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          IOSink sink = fs.file(ns('/bar')).openWrite();
+          var sink = fs.file(ns('/bar')).openWrite();
           sink.write('Hello world');
           await sink.flush();
           await sink.close();
@@ -2334,9 +2333,9 @@
         });
 
         test('overwritesContentInWriteMode', () async {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello');
-          IOSink sink = f.openWrite();
+          var sink = f.openWrite();
           sink.write('Goodbye');
           await sink.flush();
           await sink.close();
@@ -2344,9 +2343,9 @@
         });
 
         test('appendsContentInAppendMode', () async {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello');
-          IOSink sink = f.openWrite(mode: FileMode.append);
+          var sink = f.openWrite(mode: FileMode.append);
           sink.write('Goodbye');
           await sink.flush();
           await sink.close();
@@ -2354,12 +2353,12 @@
         });
 
         test('openWriteHandleDoesNotChange', () async {
-          File f = fs.file(ns('/foo'))..createSync();
-          IOSink sink = f.openWrite();
+          var f = fs.file(ns('/foo'))..createSync();
+          var sink = f.openWrite();
           sink.write('Hello');
           await sink.flush();
 
-          final File newFile = f.renameSync(ns('/bar'));
+          final newFile = f.renameSync(ns('/bar'));
           sink.write('Goodbye');
           await sink.flush();
           await sink.close();
@@ -2377,7 +2376,7 @@
           late bool isSinkClosed;
 
           Future<dynamic> closeSink() {
-            Future<dynamic> future = sink.close();
+            var future = sink.close();
             isSinkClosed = true;
             return future;
           }
@@ -2448,13 +2447,13 @@
 
           test('ignoresCloseAfterAlreadyClosed', () async {
             sink.write('Hello world');
-            Future<dynamic> f1 = closeSink();
-            Future<dynamic> f2 = closeSink();
+            var f1 = closeSink();
+            var f2 = closeSink();
             await Future.wait<dynamic>(<Future<dynamic>>[f1, f2]);
           });
 
           test('returnsAccurateDoneFuture', () async {
-            bool done = false;
+            var done = false;
             // ignore: unawaited_futures
             sink.done.then((dynamic _) => done = true);
             expect(done, isFalse);
@@ -2469,7 +2468,7 @@
             late bool isControllerClosed;
 
             Future<dynamic> closeController() {
-              Future<dynamic> future = controller.close();
+              var future = controller.close();
               isControllerClosed = true;
               return future;
             }
@@ -2543,7 +2542,7 @@
         });
 
         test('succeedsIfExistsAsFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsBytesSync(<int>[1, 2, 3, 4]);
           expect(f.readAsBytesSync(), <int>[1, 2, 3, 4]);
         });
@@ -2556,12 +2555,12 @@
         });
 
         test('returnsEmptyListForZeroByteFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expect(f.readAsBytesSync(), isEmpty);
         });
 
         test('returns a copy, not a view, of the file content', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsBytesSync(<int>[1, 2, 3, 4]);
           List<int> result = f.readAsBytesSync();
           expect(result, <int>[1, 2, 3, 4]);
@@ -2593,7 +2592,7 @@
         });
 
         test('succeedsIfExistsAsFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello world');
           expect(f.readAsStringSync(), 'Hello world');
         });
@@ -2606,14 +2605,14 @@
         });
 
         test('returnsEmptyStringForZeroByteFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expect(f.readAsStringSync(), isEmpty);
         });
       });
 
       group('readAsLines', () {
-        const String testString = 'Hello world\nHow are you?\nI am fine';
-        final List<String> expectedLines = <String>[
+        const testString = 'Hello world\nHow are you?\nI am fine';
+        final expectedLines = <String>[
           'Hello world',
           'How are you?',
           'I am fine',
@@ -2641,25 +2640,25 @@
         });
 
         test('succeedsIfExistsAsFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync(testString);
           expect(f.readAsLinesSync(), expectedLines);
         });
 
         test('succeedsIfExistsAsLinkToFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
           f.writeAsStringSync(testString);
           expect(f.readAsLinesSync(), expectedLines);
         });
 
         test('returnsEmptyListForZeroByteFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expect(f.readAsLinesSync(), isEmpty);
         });
 
         test('isTrailingNewlineAgnostic', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('$testString\n');
           expect(f.readAsLinesSync(), expectedLines);
 
@@ -2677,7 +2676,7 @@
         });
 
         test('createsFileIfDoesntExist', () {
-          File f = fs.file(ns('/foo'));
+          var f = fs.file(ns('/foo'));
           expect(f, isNot(exists));
           f.writeAsBytesSync(<int>[1, 2, 3, 4]);
           expect(f, exists);
@@ -2699,21 +2698,21 @@
         });
 
         test('succeedsIfExistsAsLinkToFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
           fs.file(ns('/bar')).writeAsBytesSync(<int>[1, 2, 3, 4]);
           expect(f.readAsBytesSync(), <int>[1, 2, 3, 4]);
         });
 
         test('throwsIfFileModeRead', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expectFileSystemException(ErrorCodes.EBADF, () {
             f.writeAsBytesSync(<int>[1], mode: FileMode.read);
           });
         });
 
         test('overwritesContentIfFileModeWrite', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsBytesSync(<int>[1, 2]);
           expect(f.readAsBytesSync(), <int>[1, 2]);
           f.writeAsBytesSync(<int>[3, 4]);
@@ -2721,7 +2720,7 @@
         });
 
         test('appendsContentIfFileModeAppend', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsBytesSync(<int>[1, 2], mode: FileMode.append);
           expect(f.readAsBytesSync(), <int>[1, 2]);
           f.writeAsBytesSync(<int>[3, 4], mode: FileMode.append);
@@ -2729,17 +2728,17 @@
         });
 
         test('acceptsEmptyBytesList', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsBytesSync(<int>[]);
           expect(f.readAsBytesSync(), <int>[]);
         });
 
         test('updatesLastModifiedTime', () async {
-          File f = fs.file(ns('/foo'))..createSync();
-          DateTime before = f.statSync().modified;
+          var f = fs.file(ns('/foo'))..createSync();
+          var before = f.statSync().modified;
           await Future<void>.delayed(const Duration(seconds: 2));
           f.writeAsBytesSync(<int>[1, 2, 3]);
-          DateTime after = f.statSync().modified;
+          var after = f.statSync().modified;
           expect(after, isAfter(before));
         });
       });
@@ -2750,7 +2749,7 @@
         });
 
         test('createsFileIfDoesntExist', () {
-          File f = fs.file(ns('/foo'));
+          var f = fs.file(ns('/foo'));
           expect(f, isNot(exists));
           f.writeAsStringSync('Hello world');
           expect(f, exists);
@@ -2772,21 +2771,21 @@
         });
 
         test('succeedsIfExistsAsLinkToFile', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
           fs.file(ns('/bar')).writeAsStringSync('Hello world');
           expect(f.readAsStringSync(), 'Hello world');
         });
 
         test('throwsIfFileModeRead', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expectFileSystemException(ErrorCodes.EBADF, () {
             f.writeAsStringSync('Hello world', mode: FileMode.read);
           });
         });
 
         test('overwritesContentIfFileModeWrite', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello world');
           expect(f.readAsStringSync(), 'Hello world');
           f.writeAsStringSync('Goodbye cruel world');
@@ -2794,7 +2793,7 @@
         });
 
         test('appendsContentIfFileModeAppend', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('Hello', mode: FileMode.append);
           expect(f.readAsStringSync(), 'Hello');
           f.writeAsStringSync('Goodbye', mode: FileMode.append);
@@ -2802,7 +2801,7 @@
         });
 
         test('acceptsEmptyString', () {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           f.writeAsStringSync('');
           expect(f.readAsStringSync(), isEmpty);
         });
@@ -2847,38 +2846,38 @@
 
       group('stat', () {
         test('isNotFoundIfDoesntExistAtTail', () {
-          FileStat stat = fs.file(ns('/foo')).statSync();
+          var stat = fs.file(ns('/foo')).statSync();
           expect(stat.type, FileSystemEntityType.notFound);
         });
 
         test('isNotFoundIfDoesntExistViaTraversal', () {
-          FileStat stat = fs.file(ns('/foo/bar')).statSync();
+          var stat = fs.file(ns('/foo/bar')).statSync();
           expect(stat.type, FileSystemEntityType.notFound);
         });
 
         test('isDirectoryIfExistsAsDirectory', () {
           fs.directory(ns('/foo')).createSync();
-          FileStat stat = fs.file(ns('/foo')).statSync();
+          var stat = fs.file(ns('/foo')).statSync();
           expect(stat.type, FileSystemEntityType.directory);
         });
 
         test('isFileIfExistsAsFile', () {
           fs.file(ns('/foo')).createSync();
-          FileStat stat = fs.file(ns('/foo')).statSync();
+          var stat = fs.file(ns('/foo')).statSync();
           expect(stat.type, FileSystemEntityType.file);
         });
 
         test('isFileIfExistsAsLinkToFile', () {
           fs.file(ns('/foo')).createSync();
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          FileStat stat = fs.file(ns('/bar')).statSync();
+          var stat = fs.file(ns('/bar')).statSync();
           expect(stat.type, FileSystemEntityType.file);
         });
       });
 
       group('delete', () {
         test('returnsCovariantType', () async {
-          File f = fs.file(ns('/foo'))..createSync();
+          var f = fs.file(ns('/foo'))..createSync();
           expect(await f.delete(), isFile);
         });
 
@@ -2953,14 +2952,14 @@
       group('uri', () {
         test('whenTargetIsDirectory', () {
           fs.directory(ns('/foo')).createSync();
-          Link l = fs.link(ns('/bar'))..createSync(ns('/foo'));
+          var l = fs.link(ns('/bar'))..createSync(ns('/foo'));
           expect(l.uri, fs.path.toUri(ns('/bar')));
           expect(fs.link('bar').uri.toString(), 'bar');
         });
 
         test('whenTargetIsFile', () {
           fs.file(ns('/foo')).createSync();
-          Link l = fs.link(ns('/bar'))..createSync(ns('/foo'));
+          var l = fs.link(ns('/bar'))..createSync(ns('/foo'));
           expect(l.uri, fs.path.toUri(ns('/bar')));
           expect(fs.link('bar').uri.toString(), 'bar');
         });
@@ -2991,24 +2990,24 @@
         });
 
         test('isTrueIfTargetIsNotFound', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           expect(l, exists);
         });
 
         test('isTrueIfTargetIsFile', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.file(ns('/bar')).createSync();
           expect(l, exists);
         });
 
         test('isTrueIfTargetIsDirectory', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.directory(ns('/bar')).createSync();
           expect(l, exists);
         });
 
         test('isTrueIfTargetIsLinkLoop', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.link(ns('/bar')).createSync(ns('/foo'));
           expect(l, exists);
         });
@@ -3038,29 +3037,29 @@
         });
 
         test('isNotFoundIfTargetNotFoundAtTail', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           expect(l.statSync().type, FileSystemEntityType.notFound);
         });
 
         test('isNotFoundIfTargetNotFoundViaTraversal', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar/baz'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar/baz'));
           expect(l.statSync().type, FileSystemEntityType.notFound);
         });
 
         test('isNotFoundIfTargetIsLinkLoop', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.link(ns('/bar')).createSync(ns('/foo'));
           expect(l.statSync().type, FileSystemEntityType.notFound);
         });
 
         test('isFileIfTargetIsFile', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.file(ns('/bar')).createSync();
           expect(l.statSync().type, FileSystemEntityType.file);
         });
 
         test('isDirectoryIfTargetIsDirectory', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.directory(ns('/bar')).createSync();
           expect(l.statSync().type, FileSystemEntityType.directory);
         });
@@ -3068,7 +3067,7 @@
 
       group('delete', () {
         test('returnsCovariantType', () async {
-          Link link = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var link = fs.link(ns('/foo'))..createSync(ns('/bar'));
           expect(await link.delete(), isLink);
         });
 
@@ -3118,7 +3117,7 @@
         });
 
         test('unlinksIfTargetIsFileAndRecursiveFalse', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.file(ns('/bar')).createSync();
           l.deleteSync();
           expect(fs.typeSync(ns('/foo'), followLinks: false),
@@ -3128,7 +3127,7 @@
         });
 
         test('unlinksIfTargetIsFileAndRecursiveTrue', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.file(ns('/bar')).createSync();
           l.deleteSync(recursive: true);
           expect(fs.typeSync(ns('/foo'), followLinks: false),
@@ -3138,7 +3137,7 @@
         });
 
         test('unlinksIfTargetIsDirectoryAndRecursiveFalse', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.directory(ns('/bar')).createSync();
           l.deleteSync();
           expect(fs.typeSync(ns('/foo'), followLinks: false),
@@ -3148,7 +3147,7 @@
         });
 
         test('unlinksIfTargetIsDirectoryAndRecursiveTrue', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.directory(ns('/bar')).createSync();
           l.deleteSync(recursive: true);
           expect(fs.typeSync(ns('/foo'), followLinks: false),
@@ -3158,7 +3157,7 @@
         });
 
         test('unlinksIfTargetIsLinkLoop', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.link(ns('/bar')).createSync(ns('/foo'));
           l.deleteSync();
           expect(fs.typeSync(ns('/foo'), followLinks: false),
@@ -3178,7 +3177,7 @@
         });
 
         test('ignoresLinkTarget', () {
-          Link l = fs.link(ns('/foo/bar'))
+          var l = fs.link(ns('/foo/bar'))
             ..createSync(ns('/baz/qux'), recursive: true);
           expect(l.parent.path, ns('/foo'));
         });
@@ -3190,7 +3189,7 @@
         });
 
         test('succeedsIfLinkDoesntExistAtTail', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           expect(fs.typeSync(ns('/foo'), followLinks: false),
               FileSystemEntityType.link);
           expect(l.targetSync(), ns('/bar'));
@@ -3203,7 +3202,7 @@
         });
 
         test('succeedsIfLinkDoesntExistViaTraversalAndRecursiveTrue', () {
-          Link l = fs.link(ns('/foo/bar'))..createSync('baz', recursive: true);
+          var l = fs.link(ns('/foo/bar'))..createSync('baz', recursive: true);
           expect(fs.typeSync(ns('/foo'), followLinks: false),
               FileSystemEntityType.directory);
           expect(fs.typeSync(ns('/foo/bar'), followLinks: false),
@@ -3242,7 +3241,7 @@
 
       group('update', () {
         test('returnsCovariantType', () async {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           expect(await l.update(ns('/baz')), isLink);
         });
 
@@ -3336,24 +3335,24 @@
         });
 
         test('succeedsIfTargetIsNotFound', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           expect(l.targetSync(), ns('/bar'));
         });
 
         test('succeedsIfTargetIsFile', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.file(ns('/bar')).createSync();
           expect(l.targetSync(), ns('/bar'));
         });
 
         test('succeedsIfTargetIsDirectory', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.directory(ns('/bar')).createSync();
           expect(l.targetSync(), ns('/bar'));
         });
 
         test('succeedsIfTargetIsLinkLoop', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.link(ns('/bar')).createSync(ns('/foo'));
           expect(l.targetSync(), ns('/bar'));
         });
@@ -3393,9 +3392,9 @@
         });
 
         test('succeedsIfSourceIsLinkToFile', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.file(ns('/bar')).createSync();
-          Link renamed = l.renameSync(ns('/baz'));
+          var renamed = l.renameSync(ns('/baz'));
           expect(renamed.path, ns('/baz'));
           expect(fs.typeSync(ns('/foo'), followLinks: false),
               FileSystemEntityType.notFound);
@@ -3407,8 +3406,8 @@
         });
 
         test('succeedsIfSourceIsLinkToNotFound', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
-          Link renamed = l.renameSync(ns('/baz'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var renamed = l.renameSync(ns('/baz'));
           expect(renamed.path, ns('/baz'));
           expect(fs.typeSync(ns('/foo'), followLinks: false),
               FileSystemEntityType.notFound);
@@ -3418,9 +3417,9 @@
         });
 
         test('succeedsIfSourceIsLinkToDirectory', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.directory(ns('/bar')).createSync();
-          Link renamed = l.renameSync(ns('/baz'));
+          var renamed = l.renameSync(ns('/baz'));
           expect(renamed.path, ns('/baz'));
           expect(fs.typeSync(ns('/foo'), followLinks: false),
               FileSystemEntityType.notFound);
@@ -3432,9 +3431,9 @@
         });
 
         test('succeedsIfSourceIsLinkLoop', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.link(ns('/bar')).createSync(ns('/foo'));
-          Link renamed = l.renameSync(ns('/baz'));
+          var renamed = l.renameSync(ns('/baz'));
           expect(renamed.path, ns('/baz'));
           expect(fs.typeSync(ns('/foo'), followLinks: false),
               FileSystemEntityType.notFound);
@@ -3446,22 +3445,22 @@
         });
 
         test('succeedsIfDestinationDoesntExistAtTail', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
-          Link renamed = l.renameSync(ns('/baz'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var renamed = l.renameSync(ns('/baz'));
           expect(renamed.path, ns('/baz'));
           expect(fs.link(ns('/foo')), isNot(exists));
           expect(fs.link(ns('/baz')), exists);
         });
 
         test('throwsIfDestinationDoesntExistViaTraversal', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           expectFileSystemException(ErrorCodes.ENOENT, () {
             l.renameSync(ns('/baz/qux'));
           });
         });
 
         test('throwsIfDestinationExistsAsFile', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.file(ns('/baz')).createSync();
           expectFileSystemException(ErrorCodes.EINVAL, () {
             l.renameSync(ns('/baz'));
@@ -3469,7 +3468,7 @@
         });
 
         test('throwsIfDestinationExistsAsDirectory', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.directory(ns('/baz')).createSync();
           expectFileSystemException(ErrorCodes.EINVAL, () {
             l.renameSync(ns('/baz'));
@@ -3477,7 +3476,7 @@
         });
 
         test('succeedsIfDestinationExistsAsLinkToFile', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.file(ns('/baz')).createSync();
           fs.link(ns('/qux')).createSync(ns('/baz'));
           l.renameSync(ns('/qux'));
@@ -3490,7 +3489,7 @@
         });
 
         test('throwsIfDestinationExistsAsLinkToDirectory', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.directory(ns('/baz')).createSync();
           fs.link(ns('/qux')).createSync(ns('/baz'));
           l.renameSync(ns('/qux'));
@@ -3503,7 +3502,7 @@
         });
 
         test('succeedsIfDestinationExistsAsLinkToNotFound', () {
-          Link l = fs.link(ns('/foo'))..createSync(ns('/bar'));
+          var l = fs.link(ns('/foo'))..createSync(ns('/bar'));
           fs.link(ns('/baz')).createSync(ns('/qux'));
           l.renameSync(ns('/baz'));
           expect(fs.typeSync(ns('/foo')), FileSystemEntityType.notFound);
diff --git a/pkgs/file/test/local_test.dart b/pkgs/file/test/local_test.dart
index e1618d2..b794ccd 100644
--- a/pkgs/file/test/local_test.dart
+++ b/pkgs/file/test/local_test.dart
@@ -2,7 +2,11 @@
 // 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.
 
+// ignore_for_file: lines_longer_than_80_chars
+
 @TestOn('vm')
+library;
+
 import 'dart:io' as io;
 
 import 'package:file/local.dart';
@@ -33,7 +37,7 @@
     setUpAll(() {
       if (io.Platform.isWindows) {
         // TODO(tvolkert): Remove once all more serious test failures are fixed
-        // https://github.com/google/file.dart/issues/56
+        // https://github.com/dart-lang/tools/issues/618
         ignoreOsErrorCodes = true;
       }
     });
@@ -42,7 +46,7 @@
       ignoreOsErrorCodes = false;
     });
 
-    Map<String, List<String>> skipOnPlatform = <String, List<String>>{
+    var skipOnPlatform = <String, List<String>>{
       'windows': <String>[
         'FileSystem > currentDirectory > throwsIfHasNonExistentPathInComplexChain',
         'FileSystem > currentDirectory > resolvesLinksIfEncountered',
diff --git a/pkgs/file/test/memory_operations_test.dart b/pkgs/file/test/memory_operations_test.dart
index 5e27843..916707c 100644
--- a/pkgs/file/test/memory_operations_test.dart
+++ b/pkgs/file/test/memory_operations_test.dart
@@ -2,22 +2,21 @@
 // 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 'package:file/file.dart';
 import 'package:file/memory.dart';
 import 'package:test/test.dart';
 
 void main() {
   test('Read operations invoke opHandle', () async {
-    List<String> contexts = <String>[];
-    List<FileSystemOp> operations = <FileSystemOp>[];
-    MemoryFileSystem fs = MemoryFileSystem.test(
+    var contexts = <String>[];
+    var operations = <FileSystemOp>[];
+    var fs = MemoryFileSystem.test(
         opHandle: (String context, FileSystemOp operation) {
       if (operation == FileSystemOp.read) {
         contexts.add(context);
         operations.add(operation);
       }
     });
-    final File file = fs.file('test')..createSync();
+    final file = fs.file('test')..createSync();
 
     await file.readAsBytes();
     file.readAsBytesSync();
@@ -34,16 +33,16 @@
   });
 
   test('Write operations invoke opHandle', () async {
-    List<String> contexts = <String>[];
-    List<FileSystemOp> operations = <FileSystemOp>[];
-    MemoryFileSystem fs = MemoryFileSystem.test(
+    var contexts = <String>[];
+    var operations = <FileSystemOp>[];
+    var fs = MemoryFileSystem.test(
         opHandle: (String context, FileSystemOp operation) {
       if (operation == FileSystemOp.write) {
         contexts.add(context);
         operations.add(operation);
       }
     });
-    final File file = fs.file('test')..createSync();
+    final file = fs.file('test')..createSync();
 
     await file.writeAsBytes(<int>[]);
     file.writeAsBytesSync(<int>[]);
@@ -60,18 +59,18 @@
   });
 
   test('Delete operations invoke opHandle', () async {
-    List<String> contexts = <String>[];
-    List<FileSystemOp> operations = <FileSystemOp>[];
-    MemoryFileSystem fs = MemoryFileSystem.test(
+    var contexts = <String>[];
+    var operations = <FileSystemOp>[];
+    var fs = MemoryFileSystem.test(
         opHandle: (String context, FileSystemOp operation) {
       if (operation == FileSystemOp.delete) {
         contexts.add(context);
         operations.add(operation);
       }
     });
-    final File file = fs.file('test')..createSync();
-    final Directory directory = fs.directory('testDir')..createSync();
-    final Link link = fs.link('testLink')..createSync('foo');
+    final file = fs.file('test')..createSync();
+    final directory = fs.directory('testDir')..createSync();
+    final link = fs.link('testLink')..createSync('foo');
 
     await file.delete();
     file.createSync();
@@ -98,9 +97,9 @@
   });
 
   test('Create operations invoke opHandle', () async {
-    List<String> contexts = <String>[];
-    List<FileSystemOp> operations = <FileSystemOp>[];
-    MemoryFileSystem fs = MemoryFileSystem.test(
+    var contexts = <String>[];
+    var operations = <FileSystemOp>[];
+    var fs = MemoryFileSystem.test(
         opHandle: (String context, FileSystemOp operation) {
       if (operation == FileSystemOp.create) {
         contexts.add(context);
@@ -139,16 +138,16 @@
   });
 
   test('Open operations invoke opHandle', () async {
-    List<String> contexts = <String>[];
-    List<FileSystemOp> operations = <FileSystemOp>[];
-    MemoryFileSystem fs = MemoryFileSystem.test(
+    var contexts = <String>[];
+    var operations = <FileSystemOp>[];
+    var fs = MemoryFileSystem.test(
         opHandle: (String context, FileSystemOp operation) {
       if (operation == FileSystemOp.open) {
         contexts.add(context);
         operations.add(operation);
       }
     });
-    final File file = fs.file('test')..createSync();
+    final file = fs.file('test')..createSync();
 
     await file.open();
     file.openSync();
@@ -165,16 +164,16 @@
   });
 
   test('Copy operations invoke opHandle', () async {
-    List<String> contexts = <String>[];
-    List<FileSystemOp> operations = <FileSystemOp>[];
-    MemoryFileSystem fs = MemoryFileSystem.test(
+    var contexts = <String>[];
+    var operations = <FileSystemOp>[];
+    var fs = MemoryFileSystem.test(
         opHandle: (String context, FileSystemOp operation) {
       if (operation == FileSystemOp.copy) {
         contexts.add(context);
         operations.add(operation);
       }
     });
-    final File file = fs.file('test')..createSync();
+    final file = fs.file('test')..createSync();
 
     await file.copy('A');
     file.copySync('B');
@@ -187,9 +186,9 @@
   });
 
   test('Exists operations invoke opHandle', () async {
-    List<String> contexts = <String>[];
-    List<FileSystemOp> operations = <FileSystemOp>[];
-    MemoryFileSystem fs = MemoryFileSystem.test(
+    var contexts = <String>[];
+    var operations = <FileSystemOp>[];
+    var fs = MemoryFileSystem.test(
         opHandle: (String context, FileSystemOp operation) {
       if (operation == FileSystemOp.exists) {
         contexts.add(context);
diff --git a/pkgs/file/test/memory_test.dart b/pkgs/file/test/memory_test.dart
index f3b324e..ce8675f 100644
--- a/pkgs/file/test/memory_test.dart
+++ b/pkgs/file/test/memory_test.dart
@@ -66,8 +66,7 @@
   });
 
   test('MemoryFileSystem.test', () {
-    final MemoryFileSystem fs =
-        MemoryFileSystem.test(); // creates root directory
+    final fs = MemoryFileSystem.test(); // creates root directory
     fs.file('/test1.txt').createSync(); // creates file
     fs.file('/test2.txt').createSync(); // creates file
     expect(fs.directory('/').statSync().modified, DateTime(2000, 1, 1, 0, 1));
@@ -95,10 +94,10 @@
   });
 
   test('MemoryFile.openSync returns a MemoryRandomAccessFile', () async {
-    final MemoryFileSystem fs = MemoryFileSystem.test();
+    final fs = MemoryFileSystem.test();
     final io.File file = fs.file('/test1')..createSync();
 
-    io.RandomAccessFile raf = file.openSync();
+    var raf = file.openSync();
     try {
       expect(raf, isA<MemoryRandomAccessFile>());
     } finally {
@@ -114,7 +113,7 @@
   });
 
   test('MemoryFileSystem.systemTempDirectory test', () {
-    final MemoryFileSystem fs = MemoryFileSystem.test();
+    final fs = MemoryFileSystem.test();
 
     final io.Directory fooA = fs.systemTempDirectory.createTempSync('foo');
     final io.Directory fooB = fs.systemTempDirectory.createTempSync('foo');
@@ -122,7 +121,7 @@
     expect(fooA.path, '/.tmp_rand0/foorand0');
     expect(fooB.path, '/.tmp_rand0/foorand1');
 
-    final MemoryFileSystem secondFs = MemoryFileSystem.test();
+    final secondFs = MemoryFileSystem.test();
 
     final io.Directory fooAA =
         secondFs.systemTempDirectory.createTempSync('foo');
@@ -136,16 +135,16 @@
 
   test('Failed UTF8 decoding in MemoryFileSystem throws a FileSystemException',
       () {
-    final MemoryFileSystem fileSystem = MemoryFileSystem.test();
-    final File file = fileSystem.file('foo')
+    final fileSystem = MemoryFileSystem.test();
+    final file = fileSystem.file('foo')
       ..writeAsBytesSync(<int>[0xFFFE]); // Invalid UTF8
 
     expect(file.readAsStringSync, throwsA(isA<FileSystemException>()));
   });
 
   test('Creating a temporary directory actually creates the directory', () {
-    final MemoryFileSystem fileSystem = MemoryFileSystem.test();
-    final Directory tempDir = fileSystem.currentDirectory.createTempSync('foo');
+    final fileSystem = MemoryFileSystem.test();
+    final tempDir = fileSystem.currentDirectory.createTempSync('foo');
 
     expect(tempDir.existsSync(), true);
   });
diff --git a/pkgs/file/test/utils.dart b/pkgs/file/test/utils.dart
index 231312f..797ec9d 100644
--- a/pkgs/file/test/utils.dart
+++ b/pkgs/file/test/utils.dart
@@ -25,7 +25,7 @@
 /// If [time] is not specified, it will default to the current time.
 DateTime ceil([DateTime? time]) {
   time ??= DateTime.now();
-  int microseconds = (1000 * time.millisecond) + time.microsecond;
+  var microseconds = (1000 * time.millisecond) + time.microsecond;
   return (microseconds == 0)
       ? time
       // Add just enough milliseconds and microseconds to reach the next second.
@@ -78,7 +78,7 @@
     bool verbose,
   ) {
     if (item is DateTime) {
-      Duration diff = item.difference(_time).abs();
+      var diff = item.difference(_time).abs();
       return description.add('is $mismatchAdjective $_time by $diff');
     } else {
       return description.add('is not a DateTime');
diff --git a/pkgs/file/test/utils_test.dart b/pkgs/file/test/utils_test.dart
index 75293bf..23788e9 100644
--- a/pkgs/file/test/utils_test.dart
+++ b/pkgs/file/test/utils_test.dart
@@ -8,9 +8,9 @@
 
 void main() {
   test('floorAndCeilProduceExactSecondDateTime', () {
-    DateTime time = DateTime.fromMicrosecondsSinceEpoch(1001);
-    DateTime lower = floor(time);
-    DateTime upper = ceil(time);
+    var time = DateTime.fromMicrosecondsSinceEpoch(1001);
+    var lower = floor(time);
+    var upper = ceil(time);
     expect(lower.millisecond, 0);
     expect(upper.millisecond, 0);
     expect(lower.microsecond, 0);
@@ -18,26 +18,26 @@
   });
 
   test('floorAndCeilWorkWithNow', () {
-    DateTime time = DateTime.now();
-    int lower = time.difference(floor(time)).inMicroseconds;
-    int upper = ceil(time).difference(time).inMicroseconds;
+    var time = DateTime.now();
+    var lower = time.difference(floor(time)).inMicroseconds;
+    var upper = ceil(time).difference(time).inMicroseconds;
     expect(lower, lessThan(1000000));
     expect(upper, lessThanOrEqualTo(1000000));
   });
 
   test('floorAndCeilWorkWithExactSecondDateTime', () {
-    DateTime time = DateTime.parse('1999-12-31 23:59:59');
-    DateTime lower = floor(time);
-    DateTime upper = ceil(time);
+    var time = DateTime.parse('1999-12-31 23:59:59');
+    var lower = floor(time);
+    var upper = ceil(time);
     expect(lower, time);
     expect(upper, time);
   });
 
   test('floorAndCeilWorkWithInexactSecondDateTime', () {
-    DateTime time = DateTime.parse('1999-12-31 23:59:59.500');
-    DateTime lower = floor(time);
-    DateTime upper = ceil(time);
-    Duration difference = upper.difference(lower);
+    var time = DateTime.parse('1999-12-31 23:59:59.500');
+    var lower = floor(time);
+    var upper = ceil(time);
+    var difference = upper.difference(lower);
     expect(difference.inMicroseconds, 1000000);
   });
 }
diff --git a/pkgs/file_testing/CHANGELOG.md b/pkgs/file_testing/CHANGELOG.md
index 0af779d..17039ee 100644
--- a/pkgs/file_testing/CHANGELOG.md
+++ b/pkgs/file_testing/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 3.1.0-wip
+
+* Changed the type of several matchers to `TypeMatcher` which allows cascading
+  their usage with `.having` and similar. 
+
 ## 3.0.2
 
 * Require Dart 3.1.
diff --git a/pkgs/file_testing/analysis_options.yaml b/pkgs/file_testing/analysis_options.yaml
index 8fbd2e4..d978f81 100644
--- a/pkgs/file_testing/analysis_options.yaml
+++ b/pkgs/file_testing/analysis_options.yaml
@@ -1,6 +1 @@
-include: package:lints/recommended.yaml
-
-analyzer:
-  errors:
-    # Allow having TODOs in the code
-    todo: ignore
+include: package:dart_flutter_team_lints/analysis_options.yaml
diff --git a/pkgs/file_testing/lib/src/testing/core_matchers.dart b/pkgs/file_testing/lib/src/testing/core_matchers.dart
index f58539f..801209e 100644
--- a/pkgs/file_testing/lib/src/testing/core_matchers.dart
+++ b/pkgs/file_testing/lib/src/testing/core_matchers.dart
@@ -2,6 +2,8 @@
 // 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.
 
+// ignore_for_file: comment_references
+
 import 'dart:io';
 
 import 'package:test/test.dart';
@@ -9,26 +11,27 @@
 import 'internal.dart';
 
 /// Matcher that successfully matches against any instance of [Directory].
-const Matcher isDirectory = TypeMatcher<Directory>();
+const isDirectory = TypeMatcher<Directory>();
 
 /// Matcher that successfully matches against any instance of [File].
-const Matcher isFile = TypeMatcher<File>();
+const isFile = TypeMatcher<File>();
 
 /// Matcher that successfully matches against any instance of [Link].
-const Matcher isLink = TypeMatcher<Link>();
+const isLink = TypeMatcher<Link>();
 
 /// Matcher that successfully matches against any instance of
 /// [FileSystemEntity].
-const Matcher isFileSystemEntity = TypeMatcher<FileSystemEntity>();
+const isFileSystemEntity = TypeMatcher<FileSystemEntity>();
 
 /// Matcher that successfully matches against any instance of [FileStat].
-const Matcher isFileStat = TypeMatcher<FileStat>();
+const isFileStat = TypeMatcher<FileStat>();
 
 /// Returns a [Matcher] that matches [path] against an entity's path.
 ///
 /// [path] may be a String, a predicate function, or a [Matcher]. If it is
 /// a String, it will be wrapped in an equality matcher.
-Matcher hasPath(dynamic path) => _HasPath(path);
+TypeMatcher<FileSystemEntity> hasPath(dynamic path) =>
+    isFileSystemEntity.having((e) => e.path, 'path', path);
 
 /// Returns a [Matcher] that successfully matches against an instance of
 /// [FileSystemException].
@@ -39,7 +42,8 @@
 /// [osErrorCode] may be an `int`, a predicate function, or a [Matcher]. If it
 /// is an `int`, it will be wrapped in an equality matcher.
 Matcher isFileSystemException([dynamic osErrorCode]) =>
-    _FileSystemException(osErrorCode);
+    const TypeMatcher<FileSystemException>().having((e) => e.osError?.errorCode,
+        'osError.errorCode', _fileExceptionWrapMatcher(osErrorCode));
 
 /// Returns a matcher that successfully matches against a future or function
 /// that throws a [FileSystemException].
@@ -67,89 +71,10 @@
 
 /// Matcher that successfully matches against a [FileSystemEntity] that
 /// exists ([FileSystemEntity.existsSync] returns true).
-const Matcher exists = _Exists();
+final TypeMatcher<FileSystemEntity> exists =
+    isFileSystemEntity.having((e) => e.existsSync(), 'existsSync', true);
 
-class _FileSystemException extends Matcher {
-  _FileSystemException(dynamic osErrorCode)
-      : _matcher = _wrapMatcher(osErrorCode);
-
-  final Matcher? _matcher;
-
-  static Matcher? _wrapMatcher(dynamic osErrorCode) {
-    if (osErrorCode == null) {
-      return null;
-    }
-    return ignoreOsErrorCodes ? anything : wrapMatcher(osErrorCode);
-  }
-
-  @override
-  bool matches(dynamic item, Map<dynamic, dynamic> matchState) {
-    if (item is FileSystemException) {
-      return _matcher == null ||
-          _matcher!.matches(item.osError?.errorCode, matchState);
-    }
-    return false;
-  }
-
-  @override
-  Description describe(Description desc) {
-    if (_matcher == null) {
-      return desc.add('FileSystemException');
-    } else {
-      desc.add('FileSystemException with osError.errorCode: ');
-      return _matcher!.describe(desc);
-    }
-  }
-}
-
-class _HasPath extends Matcher {
-  _HasPath(dynamic path) : _matcher = wrapMatcher(path);
-
-  final Matcher _matcher;
-
-  @override
-  bool matches(dynamic item, Map<dynamic, dynamic> matchState) =>
-      _matcher.matches(item.path, matchState);
-
-  @override
-  Description describe(Description desc) {
-    desc.add('has path: ');
-    return _matcher.describe(desc);
-  }
-
-  @override
-  Description describeMismatch(
-    dynamic item,
-    Description desc,
-    Map<dynamic, dynamic> matchState,
-    bool verbose,
-  ) {
-    desc.add('has path: \'${item.path}\'').add('\n   Which: ');
-    final Description pathDesc = StringDescription();
-    _matcher.describeMismatch(item.path, pathDesc, matchState, verbose);
-    desc.add(pathDesc.toString());
-    return desc;
-  }
-}
-
-class _Exists extends Matcher {
-  const _Exists();
-
-  @override
-  bool matches(dynamic item, Map<dynamic, dynamic> matchState) =>
-      item is FileSystemEntity && item.existsSync();
-
-  @override
-  Description describe(Description description) =>
-      description.add('a file system entity that exists');
-
-  @override
-  Description describeMismatch(
-    dynamic item,
-    Description description,
-    Map<dynamic, dynamic> matchState,
-    bool verbose,
-  ) {
-    return description.add('does not exist');
-  }
-}
+Matcher? _fileExceptionWrapMatcher(dynamic osErrorCode) =>
+    (osErrorCode == null || ignoreOsErrorCodes)
+        ? anything
+        : wrapMatcher(osErrorCode);
diff --git a/pkgs/file_testing/pubspec.yaml b/pkgs/file_testing/pubspec.yaml
index 691efa0..895826a 100644
--- a/pkgs/file_testing/pubspec.yaml
+++ b/pkgs/file_testing/pubspec.yaml
@@ -1,5 +1,5 @@
 name: file_testing
-version: 3.0.2
+version: 3.1.0-wip
 description: Testing utilities for package:file.
 repository: https://github.com/dart-lang/tools/tree/main/pkgs/file_testing
 issue_tracker: https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Afile_testing
@@ -10,5 +10,5 @@
 dependencies:
   test: ^1.23.1
 
-dev_dependencies: 
-  lints: ^5.0.0
+dev_dependencies:
+  dart_flutter_team_lints: ^3.0.0
diff --git a/pkgs/source_maps/CHANGELOG.md b/pkgs/source_maps/CHANGELOG.md
index ae7711e..b06ac72 100644
--- a/pkgs/source_maps/CHANGELOG.md
+++ b/pkgs/source_maps/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 0.10.14-wip
+
 ## 0.10.13
 
 * Require Dart 3.3
diff --git a/pkgs/source_maps/lib/builder.dart b/pkgs/source_maps/lib/builder.dart
index 54ba743..9043c63 100644
--- a/pkgs/source_maps/lib/builder.dart
+++ b/pkgs/source_maps/lib/builder.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Contains a builder object useful for creating source maps programatically.
-library source_maps.builder;
+library;
 
 // TODO(sigmund): add a builder for multi-section mappings.
 
diff --git a/pkgs/source_maps/lib/parser.dart b/pkgs/source_maps/lib/parser.dart
index b699ac7..590dfc6 100644
--- a/pkgs/source_maps/lib/parser.dart
+++ b/pkgs/source_maps/lib/parser.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Contains the top-level function to parse source maps version 3.
-library source_maps.parser;
+library;
 
 import 'dart:convert';
 
diff --git a/pkgs/source_maps/lib/printer.dart b/pkgs/source_maps/lib/printer.dart
index 17733cd..32523d6 100644
--- a/pkgs/source_maps/lib/printer.dart
+++ b/pkgs/source_maps/lib/printer.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Contains a code printer that generates code by recording the source maps.
-library source_maps.printer;
+library;
 
 import 'package:source_span/source_span.dart';
 
diff --git a/pkgs/source_maps/lib/refactor.dart b/pkgs/source_maps/lib/refactor.dart
index 98e0c93..a518a0c 100644
--- a/pkgs/source_maps/lib/refactor.dart
+++ b/pkgs/source_maps/lib/refactor.dart
@@ -6,7 +6,7 @@
 ///
 /// [TextEditTransaction] supports making a series of changes to a text buffer.
 /// [guessIndent] helps to guess the appropriate indentiation for the new code.
-library source_maps.refactor;
+library;
 
 import 'package:source_span/source_span.dart';
 
diff --git a/pkgs/source_maps/lib/source_maps.dart b/pkgs/source_maps/lib/source_maps.dart
index 58f805a..244dee7 100644
--- a/pkgs/source_maps/lib/source_maps.dart
+++ b/pkgs/source_maps/lib/source_maps.dart
@@ -24,7 +24,7 @@
 /// var mapping = parse(json);
 /// mapping.spanFor(outputSpan1.line, outputSpan1.column)
 /// ```
-library source_maps;
+library;
 
 import 'package:source_span/source_span.dart';
 
diff --git a/pkgs/source_maps/lib/src/utils.dart b/pkgs/source_maps/lib/src/utils.dart
index f70531e..ba04fbb 100644
--- a/pkgs/source_maps/lib/src/utils.dart
+++ b/pkgs/source_maps/lib/src/utils.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Utilities that shouldn't be in this package.
-library source_maps.utils;
+library;
 
 /// Find the first entry in a sorted [list] that matches a monotonic predicate.
 /// Given a result `n`, that all items before `n` will not match, `n` matches,
diff --git a/pkgs/source_maps/lib/src/vlq.dart b/pkgs/source_maps/lib/src/vlq.dart
index 61b4768..3b0562d 100644
--- a/pkgs/source_maps/lib/src/vlq.dart
+++ b/pkgs/source_maps/lib/src/vlq.dart
@@ -10,7 +10,7 @@
 /// represented by using the least significant bit of the value as the sign bit.
 ///
 /// For more details see the source map [version 3 documentation](https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?usp=sharing).
-library source_maps.src.vlq;
+library;
 
 import 'dart:math';
 
diff --git a/pkgs/source_maps/pubspec.yaml b/pkgs/source_maps/pubspec.yaml
index 8518fa7..32cbf4f 100644
--- a/pkgs/source_maps/pubspec.yaml
+++ b/pkgs/source_maps/pubspec.yaml
@@ -1,5 +1,5 @@
 name: source_maps
-version: 0.10.13
+version: 0.10.14-wip
 description: A library to programmatically manipulate source map files.
 repository: https://github.com/dart-lang/tools/tree/main/pkgs/source_maps
 
@@ -10,6 +10,6 @@
   source_span: ^1.8.0
 
 dev_dependencies:
-  dart_flutter_team_lints: ^2.0.0
+  dart_flutter_team_lints: ^3.0.0
   term_glyph: ^1.2.0
   test: ^1.16.0
diff --git a/pkgs/source_maps/test/common.dart b/pkgs/source_maps/test/common.dart
index f6139de..e225ff5 100644
--- a/pkgs/source_maps/test/common.dart
+++ b/pkgs/source_maps/test/common.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Common input/output used by builder, parser and end2end tests
-library test.common;
+library;
 
 import 'package:source_maps/source_maps.dart';
 import 'package:source_span/source_span.dart';
diff --git a/pkgs/source_maps/test/utils_test.dart b/pkgs/source_maps/test/utils_test.dart
index 4abdce2..2516d1e 100644
--- a/pkgs/source_maps/test/utils_test.dart
+++ b/pkgs/source_maps/test/utils_test.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Tests for the binary search utility algorithm.
-library test.utils_test;
+library;
 
 import 'package:source_maps/src/utils.dart';
 import 'package:test/test.dart';
diff --git a/pkgs/timing/.gitignore b/pkgs/timing/.gitignore
new file mode 100644
index 0000000..1ddf798
--- /dev/null
+++ b/pkgs/timing/.gitignore
@@ -0,0 +1,7 @@
+.packages
+/build/
+pubspec.lock
+
+# Files generated by dart tools
+.dart_tool
+doc/
diff --git a/pkgs/timing/CHANGELOG.md b/pkgs/timing/CHANGELOG.md
new file mode 100644
index 0000000..8cdb8ea
--- /dev/null
+++ b/pkgs/timing/CHANGELOG.md
@@ -0,0 +1,34 @@
+## 1.0.2
+
+- Require Dart `3.4`.
+- Move to `dart-lang/tools` monorepo.
+
+## 1.0.1
+
+- Require Dart `2.14`.
+
+## 1.0.0
+
+- Enable null safety.
+- Require Dart `2.12`.
+
+## 0.1.1+3
+
+- Allow `package:json_annotation` `'>=1.0.0 <5.0.0'`.
+
+## 0.1.1+2
+
+- Support the latest version of `package:json_annotation`.
+- Require Dart 2.2 or later.
+
+## 0.1.1+1
+
+- Support the latest version of `package:json_annotation`.
+
+## 0.1.1
+
+- Add JSON serialization
+
+## 0.1.0
+
+- Initial release
diff --git a/pkgs/timing/LICENSE b/pkgs/timing/LICENSE
new file mode 100644
index 0000000..9972f6e
--- /dev/null
+++ b/pkgs/timing/LICENSE
@@ -0,0 +1,27 @@
+Copyright 2018, the Dart project authors. 
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of Google LLC nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/pkgs/timing/README.md b/pkgs/timing/README.md
new file mode 100644
index 0000000..9dab7cc
--- /dev/null
+++ b/pkgs/timing/README.md
@@ -0,0 +1,30 @@
+[![Build Status](https://github.com/dart-lang/tools/actions/workflows/timing.yaml/badge.svg)](https://github.com/dart-lang/tools/actions/workflows/timing.yaml)
+[![pub package](https://img.shields.io/pub/v/timing.svg)](https://pub.dev/packages/timing)
+[![package publisher](https://img.shields.io/pub/publisher/timing.svg)](https://pub.dev/packages/timing/publisher)
+
+Timing is a simple package for tracking performance of both async and sync actions
+
+## Usage
+
+```dart
+var tracker = AsyncTimeTracker();
+await tracker.track(() async {
+  // some async code here
+});
+
+// Use results
+print('${tracker.duration} ${tracker.innerDuration} ${tracker.slices}');
+```
+
+## Building
+
+Use the following command to re-generate `lib/src/timing.g.dart` file:
+
+```bash
+dart pub run build_runner build
+```
+
+## Publishing automation
+
+For information about our publishing automation and release process, see
+https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.
diff --git a/pkgs/timing/analysis_options.yaml b/pkgs/timing/analysis_options.yaml
new file mode 100644
index 0000000..396236d
--- /dev/null
+++ b/pkgs/timing/analysis_options.yaml
@@ -0,0 +1,2 @@
+# https://dart.dev/tools/analysis#the-analysis-options-file
+include: package:dart_flutter_team_lints/analysis_options.yaml
diff --git a/pkgs/timing/lib/src/clock.dart b/pkgs/timing/lib/src/clock.dart
new file mode 100644
index 0000000..6a9d295
--- /dev/null
+++ b/pkgs/timing/lib/src/clock.dart
@@ -0,0 +1,20 @@
+// Copyright (c) 2017, 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:async';
+
+/// A function that returns the current [DateTime].
+typedef _Clock = DateTime Function();
+DateTime _defaultClock() => DateTime.now();
+
+const _zoneKey = #timing_Clock;
+
+/// Returns the current [DateTime].
+///
+/// May be overridden for tests using [scopeClock].
+DateTime now() => (Zone.current[_zoneKey] as _Clock? ?? _defaultClock)();
+
+/// Runs [f], with [clock] scoped whenever [now] is called.
+T scopeClock<T>(DateTime Function() clock, T Function() f) =>
+    runZoned(f, zoneValues: {_zoneKey: clock});
diff --git a/pkgs/timing/lib/src/timing.dart b/pkgs/timing/lib/src/timing.dart
new file mode 100644
index 0000000..049ba81
--- /dev/null
+++ b/pkgs/timing/lib/src/timing.dart
@@ -0,0 +1,338 @@
+// Copyright (c) 2018, 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:async';
+
+import 'package:json_annotation/json_annotation.dart';
+
+import 'clock.dart';
+
+part 'timing.g.dart';
+
+/// The timings of an operation, including its [startTime], [stopTime], and
+/// [duration].
+@JsonSerializable()
+class TimeSlice {
+  /// The total duration of this operation, equivalent to taking the difference
+  /// between [stopTime] and [startTime].
+  Duration get duration => stopTime.difference(startTime);
+
+  final DateTime startTime;
+
+  final DateTime stopTime;
+
+  TimeSlice(this.startTime, this.stopTime);
+
+  factory TimeSlice.fromJson(Map<String, dynamic> json) =>
+      _$TimeSliceFromJson(json);
+
+  Map<String, dynamic> toJson() => _$TimeSliceToJson(this);
+
+  @override
+  String toString() => '($startTime + $duration)';
+}
+
+/// The timings of an async operation, consist of several sync [slices] and
+/// includes total [startTime], [stopTime], and [duration].
+@JsonSerializable()
+class TimeSliceGroup implements TimeSlice {
+  final List<TimeSlice> slices;
+
+  @override
+  DateTime get startTime => slices.first.startTime;
+
+  @override
+  DateTime get stopTime => slices.last.stopTime;
+
+  /// The total duration of this operation, equivalent to taking the difference
+  /// between [stopTime] and [startTime].
+  @override
+  Duration get duration => stopTime.difference(startTime);
+
+  /// Sum of [duration]s of all [slices].
+  ///
+  /// If some of slices implements [TimeSliceGroup] [innerDuration] will be used
+  /// to compute sum.
+  Duration get innerDuration => slices.fold(
+      Duration.zero,
+      (duration, slice) =>
+          duration +
+          (slice is TimeSliceGroup ? slice.innerDuration : slice.duration));
+
+  TimeSliceGroup(this.slices);
+
+  /// Constructs TimeSliceGroup from JSON representation
+  factory TimeSliceGroup.fromJson(Map<String, dynamic> json) =>
+      _$TimeSliceGroupFromJson(json);
+
+  @override
+  Map<String, dynamic> toJson() => _$TimeSliceGroupToJson(this);
+
+  @override
+  String toString() => slices.toString();
+}
+
+abstract class TimeTracker implements TimeSlice {
+  /// Whether tracking is active.
+  ///
+  /// Tracking is only active after `isStarted` and before `isFinished`.
+  bool get isTracking;
+
+  /// Whether tracking is finished.
+  ///
+  /// Tracker can't be used as [TimeSlice] before it is finished
+  bool get isFinished;
+
+  /// Whether tracking was started.
+  ///
+  /// Equivalent of `isTracking || isFinished`
+  bool get isStarted;
+
+  T track<T>(T Function() action);
+}
+
+/// Tracks only sync actions
+class SyncTimeTracker implements TimeTracker {
+  /// When this operation started, call [_start] to set this.
+  @override
+  DateTime get startTime => _startTime!;
+  DateTime? _startTime;
+
+  /// When this operation stopped, call [_stop] to set this.
+  @override
+  DateTime get stopTime => _stopTime!;
+  DateTime? _stopTime;
+
+  /// Start tracking this operation, must only be called once, before [_stop].
+  void _start() {
+    assert(_startTime == null && _stopTime == null);
+    _startTime = now();
+  }
+
+  /// Stop tracking this operation, must only be called once, after [_start].
+  void _stop() {
+    assert(_startTime != null && _stopTime == null);
+    _stopTime = now();
+  }
+
+  /// Splits tracker into two slices.
+  ///
+  /// Returns new [TimeSlice] started on [startTime] and ended now. Modifies
+  /// [startTime] of tracker to current time point
+  ///
+  /// Don't change state of tracker. Can be called only while [isTracking], and
+  /// tracker will sill be tracking after call.
+  TimeSlice _split() {
+    if (!isTracking) {
+      throw StateError('Can be only called while tracking');
+    }
+    final splitPoint = now();
+    final prevSlice = TimeSlice(_startTime!, splitPoint);
+    _startTime = splitPoint;
+    return prevSlice;
+  }
+
+  @override
+  T track<T>(T Function() action) {
+    if (isStarted) {
+      throw StateError('Can not be tracked twice');
+    }
+    _start();
+    try {
+      return action();
+    } finally {
+      _stop();
+    }
+  }
+
+  @override
+  bool get isStarted => _startTime != null;
+
+  @override
+  bool get isTracking => _startTime != null && _stopTime == null;
+
+  @override
+  bool get isFinished => _startTime != null && _stopTime != null;
+
+  @override
+  Duration get duration => _stopTime!.difference(_startTime!);
+
+  /// Converts to JSON representation
+  ///
+  /// Can't be used before [isFinished]
+  @override
+  Map<String, dynamic> toJson() => _$TimeSliceToJson(this);
+}
+
+/// Async actions returning [Future] will be tracked as single sync time span
+/// from the beginning of execution till completion of future
+class SimpleAsyncTimeTracker extends SyncTimeTracker {
+  @override
+  T track<T>(T Function() action) {
+    if (isStarted) {
+      throw StateError('Can not be tracked twice');
+    }
+    T result;
+    _start();
+    try {
+      result = action();
+    } catch (_) {
+      _stop();
+      rethrow;
+    }
+    if (result is Future) {
+      return result.whenComplete(_stop) as T;
+    } else {
+      _stop();
+      return result;
+    }
+  }
+}
+
+/// No-op implementation of [SyncTimeTracker] that does nothing.
+class NoOpTimeTracker implements TimeTracker {
+  static final sharedInstance = NoOpTimeTracker();
+
+  @override
+  Duration get duration =>
+      throw UnsupportedError('Unsupported in no-op implementation');
+
+  @override
+  DateTime get startTime =>
+      throw UnsupportedError('Unsupported in no-op implementation');
+
+  @override
+  DateTime get stopTime =>
+      throw UnsupportedError('Unsupported in no-op implementation');
+
+  @override
+  bool get isStarted =>
+      throw UnsupportedError('Unsupported in no-op implementation');
+
+  @override
+  bool get isTracking =>
+      throw UnsupportedError('Unsupported in no-op implementation');
+
+  @override
+  bool get isFinished =>
+      throw UnsupportedError('Unsupported in no-op implementation');
+
+  @override
+  T track<T>(T Function() action) => action();
+
+  @override
+  Map<String, dynamic> toJson() =>
+      throw UnsupportedError('Unsupported in no-op implementation');
+}
+
+/// Track all async execution as disjoint time [slices] in ascending order.
+///
+/// Can [track] both async and sync actions.
+/// Can exclude time of tested trackers.
+///
+/// If tracked action spawns some dangled async executions behavior is't
+/// defined. Tracked might or might not track time of such executions
+class AsyncTimeTracker extends TimeSliceGroup implements TimeTracker {
+  final bool trackNested;
+
+  static const _zoneKey = #timing_AsyncTimeTracker;
+
+  AsyncTimeTracker({this.trackNested = true}) : super([]);
+
+  T _trackSyncSlice<T>(ZoneDelegate parent, Zone zone, T Function() action) {
+    // Ignore dangling runs after tracker completes
+    if (isFinished) {
+      return action();
+    }
+
+    final isNestedRun = slices.isNotEmpty &&
+        slices.last is SyncTimeTracker &&
+        (slices.last as SyncTimeTracker).isTracking;
+    final isExcludedNestedTrack = !trackNested && zone[_zoneKey] != this;
+
+    // Exclude nested sync tracks
+    if (isNestedRun && isExcludedNestedTrack) {
+      final timer = slices.last as SyncTimeTracker;
+      // Split already tracked time into new slice.
+      // Replace tracker in slices.last with splitted slice, to indicate for
+      // recursive calls that we not tracking.
+      slices.last = parent.run(zone, timer._split);
+      try {
+        return action();
+      } finally {
+        // Split tracker again and discard slice from nested tracker
+        parent.run(zone, timer._split);
+        // Add tracker back to list of slices and continue tracking
+        slices.add(timer);
+      }
+    }
+
+    // Exclude nested async tracks
+    if (isExcludedNestedTrack) {
+      return action();
+    }
+
+    // Split time slices in nested sync runs
+    if (isNestedRun) {
+      return action();
+    }
+
+    final timer = SyncTimeTracker();
+    slices.add(timer);
+
+    // Pass to parent zone, in case of overwritten clock
+    return parent.runUnary(zone, timer.track, action);
+  }
+
+  static final asyncTimeTrackerZoneSpecification = ZoneSpecification(
+    run: <R>(Zone self, ZoneDelegate parent, Zone zone, R Function() f) {
+      final tracker = self[_zoneKey] as AsyncTimeTracker;
+      return tracker._trackSyncSlice(parent, zone, () => parent.run(zone, f));
+    },
+    runUnary: <R, T>(Zone self, ZoneDelegate parent, Zone zone, R Function(T) f,
+        T arg) {
+      final tracker = self[_zoneKey] as AsyncTimeTracker;
+      return tracker._trackSyncSlice(
+          parent, zone, () => parent.runUnary(zone, f, arg));
+    },
+    runBinary: <R, T1, T2>(Zone self, ZoneDelegate parent, Zone zone,
+        R Function(T1, T2) f, T1 arg1, T2 arg2) {
+      final tracker = self[_zoneKey] as AsyncTimeTracker;
+      return tracker._trackSyncSlice(
+          parent, zone, () => parent.runBinary(zone, f, arg1, arg2));
+    },
+  );
+
+  @override
+  T track<T>(T Function() action) {
+    if (isStarted) {
+      throw StateError('Can not be tracked twice');
+    }
+    _tracking = true;
+    final result = runZoned(action,
+        zoneSpecification: asyncTimeTrackerZoneSpecification,
+        zoneValues: {_zoneKey: this});
+    if (result is Future) {
+      return result
+          // Break possible sync processing of future completion, so slice
+          // trackers can be finished
+          .whenComplete(Future.value)
+          .whenComplete(() => _tracking = false) as T;
+    } else {
+      _tracking = false;
+      return result;
+    }
+  }
+
+  bool? _tracking;
+
+  @override
+  bool get isStarted => _tracking != null;
+
+  @override
+  bool get isFinished => _tracking == false;
+
+  @override
+  bool get isTracking => _tracking == true;
+}
diff --git a/pkgs/timing/lib/src/timing.g.dart b/pkgs/timing/lib/src/timing.g.dart
new file mode 100644
index 0000000..679c082
--- /dev/null
+++ b/pkgs/timing/lib/src/timing.g.dart
@@ -0,0 +1,29 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'timing.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+TimeSlice _$TimeSliceFromJson(Map<String, dynamic> json) => TimeSlice(
+      DateTime.parse(json['startTime'] as String),
+      DateTime.parse(json['stopTime'] as String),
+    );
+
+Map<String, dynamic> _$TimeSliceToJson(TimeSlice instance) => <String, dynamic>{
+      'startTime': instance.startTime.toIso8601String(),
+      'stopTime': instance.stopTime.toIso8601String(),
+    };
+
+TimeSliceGroup _$TimeSliceGroupFromJson(Map<String, dynamic> json) =>
+    TimeSliceGroup(
+      (json['slices'] as List<dynamic>)
+          .map((e) => TimeSlice.fromJson(e as Map<String, dynamic>))
+          .toList(),
+    );
+
+Map<String, dynamic> _$TimeSliceGroupToJson(TimeSliceGroup instance) =>
+    <String, dynamic>{
+      'slices': instance.slices,
+    };
diff --git a/pkgs/timing/lib/timing.dart b/pkgs/timing/lib/timing.dart
new file mode 100644
index 0000000..5cb16d4
--- /dev/null
+++ b/pkgs/timing/lib/timing.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2018, 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.
+
+export 'src/timing.dart'
+    show
+        AsyncTimeTracker,
+        NoOpTimeTracker,
+        SimpleAsyncTimeTracker,
+        SyncTimeTracker,
+        TimeSlice,
+        TimeSliceGroup,
+        TimeTracker;
diff --git a/pkgs/timing/pubspec.yaml b/pkgs/timing/pubspec.yaml
new file mode 100644
index 0000000..891a8af
--- /dev/null
+++ b/pkgs/timing/pubspec.yaml
@@ -0,0 +1,18 @@
+name: timing
+version: 1.0.2
+description: >-
+  A simple package for tracking the performance of synchronous and asynchronous
+  actions.
+repository: https://github.com/dart-lang/tools/tree/main/pkgs/timing
+
+environment:
+  sdk: ^3.4.0
+
+dependencies:
+  json_annotation: ^4.9.0
+
+dev_dependencies:
+  build_runner: ^2.0.6
+  dart_flutter_team_lints: ^3.0.0
+  json_serializable: ^6.0.0
+  test: ^1.17.10
diff --git a/pkgs/timing/test/timing_test.dart b/pkgs/timing/test/timing_test.dart
new file mode 100644
index 0000000..b5836d9
--- /dev/null
+++ b/pkgs/timing/test/timing_test.dart
@@ -0,0 +1,416 @@
+// Copyright (c) 2018, 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.
+
+// ignore_for_file: only_throw_errors, inference_failure_on_instance_creation
+
+import 'dart:async';
+
+import 'package:test/test.dart';
+import 'package:timing/src/clock.dart';
+import 'package:timing/src/timing.dart';
+
+void _noop() {}
+
+void main() {
+  late DateTime time;
+  final startTime = DateTime(2017);
+  DateTime fakeClock() => time;
+
+  late TimeTracker tracker;
+  late TimeTracker nestedTracker;
+
+  T scopedTrack<T>(T Function() f) =>
+      scopeClock(fakeClock, () => tracker.track(f));
+
+  setUp(() {
+    time = startTime;
+  });
+
+  void canHandleSync([void Function() additionalExpects = _noop]) {
+    test('Can track sync code', () {
+      expect(tracker.isStarted, false);
+      expect(tracker.isTracking, false);
+      expect(tracker.isFinished, false);
+      scopedTrack(() {
+        expect(tracker.isStarted, true);
+        expect(tracker.isTracking, true);
+        expect(tracker.isFinished, false);
+        time = time.add(const Duration(seconds: 5));
+      });
+      expect(tracker.isStarted, true);
+      expect(tracker.isTracking, false);
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(seconds: 5));
+      additionalExpects();
+    });
+
+    test('Can track handled sync exceptions', () async {
+      scopedTrack(() {
+        try {
+          time = time.add(const Duration(seconds: 4));
+          throw 'error';
+        } on String {
+          time = time.add(const Duration(seconds: 1));
+        }
+      });
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(seconds: 5));
+      additionalExpects();
+    });
+
+    test('Can track in case of unhandled sync exceptions', () async {
+      expect(
+          () => scopedTrack(() {
+                time = time.add(const Duration(seconds: 5));
+                throw 'error';
+              }),
+          throwsA(const TypeMatcher<String>()));
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(seconds: 5));
+      additionalExpects();
+    });
+
+    test('Can be nested sync', () {
+      scopedTrack(() {
+        time = time.add(const Duration(seconds: 1));
+        nestedTracker.track(() {
+          time = time.add(const Duration(seconds: 2));
+        });
+        time = time.add(const Duration(seconds: 4));
+      });
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(seconds: 7));
+      expect(nestedTracker.startTime.isAfter(startTime), true);
+      expect(nestedTracker.stopTime.isBefore(time), true);
+      expect(nestedTracker.duration, const Duration(seconds: 2));
+      additionalExpects();
+    });
+  }
+
+  void canHandleAsync([void Function() additionalExpects = _noop]) {
+    test('Can track async code', () async {
+      expect(tracker.isStarted, false);
+      expect(tracker.isTracking, false);
+      expect(tracker.isFinished, false);
+      await scopedTrack(() => Future(() {
+            expect(tracker.isStarted, true);
+            expect(tracker.isTracking, true);
+            expect(tracker.isFinished, false);
+            time = time.add(const Duration(seconds: 5));
+          }));
+      expect(tracker.isStarted, true);
+      expect(tracker.isTracking, false);
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(seconds: 5));
+      additionalExpects();
+    });
+
+    test('Can track handled async exceptions', () async {
+      await scopedTrack(() {
+        time = time.add(const Duration(seconds: 1));
+        return Future(() {
+          time = time.add(const Duration(seconds: 2));
+          throw 'error';
+        }).then((_) {
+          time = time.add(const Duration(seconds: 4));
+        }).catchError((error, stack) {
+          time = time.add(const Duration(seconds: 8));
+        });
+      });
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(seconds: 11));
+      additionalExpects();
+    });
+
+    test('Can track in case of unhandled async exceptions', () async {
+      final future = scopedTrack(() {
+        time = time.add(const Duration(seconds: 1));
+        return Future(() {
+          time = time.add(const Duration(seconds: 2));
+          throw 'error';
+        }).then((_) {
+          time = time.add(const Duration(seconds: 4));
+        });
+      });
+      await expectLater(future, throwsA(const TypeMatcher<String>()));
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(seconds: 3));
+      additionalExpects();
+    });
+
+    test('Can be nested async', () async {
+      await scopedTrack(() async {
+        time = time.add(const Duration(milliseconds: 1));
+        await Future.value();
+        time = time.add(const Duration(milliseconds: 2));
+        await nestedTracker.track(() async {
+          time = time.add(const Duration(milliseconds: 4));
+          await Future.value();
+          time = time.add(const Duration(milliseconds: 8));
+          await Future.value();
+          time = time.add(const Duration(milliseconds: 16));
+        });
+        time = time.add(const Duration(milliseconds: 32));
+        await Future.value();
+        time = time.add(const Duration(milliseconds: 64));
+      });
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(milliseconds: 127));
+      expect(nestedTracker.startTime.isAfter(startTime), true);
+      expect(nestedTracker.stopTime.isBefore(time), true);
+      expect(nestedTracker.duration, const Duration(milliseconds: 28));
+      additionalExpects();
+    });
+  }
+
+  group('SyncTimeTracker', () {
+    setUp(() {
+      tracker = SyncTimeTracker();
+      nestedTracker = SyncTimeTracker();
+    });
+
+    canHandleSync();
+
+    test('Can not track async code', () async {
+      await scopedTrack(() => Future(() {
+            time = time.add(const Duration(seconds: 5));
+          }));
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, startTime);
+      expect(tracker.duration, const Duration(seconds: 0));
+    });
+  });
+
+  group('AsyncTimeTracker.simple', () {
+    setUp(() {
+      tracker = SimpleAsyncTimeTracker();
+      nestedTracker = SimpleAsyncTimeTracker();
+    });
+
+    canHandleSync();
+
+    canHandleAsync();
+
+    test('Can not distinguish own async code', () async {
+      final future = scopedTrack(() => Future(() {
+            time = time.add(const Duration(seconds: 5));
+          }));
+      time = time.add(const Duration(seconds: 10));
+      await future;
+      expect(tracker.isFinished, true);
+      expect(tracker.startTime, startTime);
+      expect(tracker.stopTime, time);
+      expect(tracker.duration, const Duration(seconds: 15));
+    });
+  });
+
+  group('AsyncTimeTracker', () {
+    late AsyncTimeTracker asyncTracker;
+    late AsyncTimeTracker nestedAsyncTracker;
+    setUp(() {
+      tracker = asyncTracker = AsyncTimeTracker();
+      nestedTracker = nestedAsyncTracker = AsyncTimeTracker();
+    });
+
+    canHandleSync(() {
+      expect(asyncTracker.innerDuration, asyncTracker.duration);
+      expect(asyncTracker.slices.length, 1);
+    });
+
+    canHandleAsync(() {
+      expect(asyncTracker.innerDuration, asyncTracker.duration);
+      expect(asyncTracker.slices.length, greaterThan(1));
+    });
+
+    test('Can track complex async innerDuration', () async {
+      final completer = Completer();
+      final future = scopedTrack(() async {
+        time = time.add(const Duration(seconds: 1)); // Tracked sync
+        await Future.value();
+        time = time.add(const Duration(seconds: 2)); // Tracked async
+        await completer.future;
+        time = time.add(const Duration(seconds: 4)); // Tracked async, delayed
+      }).then((_) {
+        time = time.add(const Duration(seconds: 8)); // Async, after tracking
+      });
+      time = time.add(const Duration(seconds: 16)); // Sync, between slices
+
+      await Future(() {
+        // Async, between slices
+        time = time.add(const Duration(seconds: 32));
+        completer.complete();
+      });
+      await future;
+      expect(asyncTracker.isFinished, true);
+      expect(asyncTracker.startTime, startTime);
+      expect(asyncTracker.stopTime.isBefore(time), true);
+      expect(asyncTracker.duration, const Duration(seconds: 55));
+      expect(asyncTracker.innerDuration, const Duration(seconds: 7));
+      expect(asyncTracker.slices.length, greaterThan(1));
+    });
+
+    test('Can exclude nested sync', () {
+      tracker = asyncTracker = AsyncTimeTracker(trackNested: false);
+      scopedTrack(() {
+        time = time.add(const Duration(seconds: 1));
+        nestedAsyncTracker.track(() {
+          time = time.add(const Duration(seconds: 2));
+        });
+        time = time.add(const Duration(seconds: 4));
+      });
+      expect(asyncTracker.isFinished, true);
+      expect(asyncTracker.startTime, startTime);
+      expect(asyncTracker.stopTime, time);
+      expect(asyncTracker.duration, const Duration(seconds: 7));
+      expect(asyncTracker.innerDuration, const Duration(seconds: 5));
+      expect(asyncTracker.slices.length, greaterThan(1));
+      expect(nestedAsyncTracker.startTime.isAfter(startTime), true);
+      expect(nestedAsyncTracker.stopTime.isBefore(time), true);
+      expect(nestedAsyncTracker.duration, const Duration(seconds: 2));
+      expect(nestedAsyncTracker.innerDuration, const Duration(seconds: 2));
+      expect(nestedAsyncTracker.slices.length, 1);
+    });
+
+    test('Can exclude complex nested sync', () {
+      tracker = asyncTracker = AsyncTimeTracker(trackNested: false);
+      nestedAsyncTracker = AsyncTimeTracker(trackNested: false);
+      final nestedAsyncTracker2 = AsyncTimeTracker(trackNested: false);
+      scopedTrack(() {
+        time = time.add(const Duration(seconds: 1));
+        nestedAsyncTracker.track(() {
+          time = time.add(const Duration(seconds: 2));
+          nestedAsyncTracker2.track(() {
+            time = time.add(const Duration(seconds: 4));
+          });
+          time = time.add(const Duration(seconds: 8));
+        });
+        time = time.add(const Duration(seconds: 16));
+      });
+      expect(asyncTracker.isFinished, true);
+      expect(asyncTracker.startTime, startTime);
+      expect(asyncTracker.stopTime, time);
+      expect(asyncTracker.duration, const Duration(seconds: 31));
+      expect(asyncTracker.innerDuration, const Duration(seconds: 17));
+      expect(asyncTracker.slices.length, greaterThan(1));
+      expect(nestedAsyncTracker.startTime.isAfter(startTime), true);
+      expect(nestedAsyncTracker.stopTime.isBefore(time), true);
+      expect(nestedAsyncTracker.duration, const Duration(seconds: 14));
+      expect(nestedAsyncTracker.innerDuration, const Duration(seconds: 10));
+      expect(nestedAsyncTracker.slices.length, greaterThan(1));
+      expect(nestedAsyncTracker2.startTime.isAfter(startTime), true);
+      expect(nestedAsyncTracker2.stopTime.isBefore(time), true);
+      expect(nestedAsyncTracker2.duration, const Duration(seconds: 4));
+      expect(nestedAsyncTracker2.innerDuration, const Duration(seconds: 4));
+      expect(nestedAsyncTracker2.slices.length, 1);
+    });
+
+    test(
+        'Can track all on grand-parent level and '
+        'exclude grand-childrens from parent', () {
+      tracker = asyncTracker = AsyncTimeTracker(trackNested: true);
+      nestedAsyncTracker = AsyncTimeTracker(trackNested: false);
+      final nestedAsyncTracker2 = AsyncTimeTracker();
+      scopedTrack(() {
+        time = time.add(const Duration(seconds: 1));
+        nestedAsyncTracker.track(() {
+          time = time.add(const Duration(seconds: 2));
+          nestedAsyncTracker2.track(() {
+            time = time.add(const Duration(seconds: 4));
+          });
+          time = time.add(const Duration(seconds: 8));
+        });
+        time = time.add(const Duration(seconds: 16));
+      });
+      expect(asyncTracker.isFinished, true);
+      expect(asyncTracker.startTime, startTime);
+      expect(asyncTracker.stopTime, time);
+      expect(asyncTracker.duration, const Duration(seconds: 31));
+      expect(asyncTracker.innerDuration, const Duration(seconds: 31));
+      expect(asyncTracker.slices.length, 1);
+      expect(nestedAsyncTracker.startTime.isAfter(startTime), true);
+      expect(nestedAsyncTracker.stopTime.isBefore(time), true);
+      expect(nestedAsyncTracker.duration, const Duration(seconds: 14));
+      expect(nestedAsyncTracker.innerDuration, const Duration(seconds: 10));
+      expect(nestedAsyncTracker.slices.length, greaterThan(1));
+      expect(nestedAsyncTracker2.startTime.isAfter(startTime), true);
+      expect(nestedAsyncTracker2.stopTime.isBefore(time), true);
+      expect(nestedAsyncTracker2.duration, const Duration(seconds: 4));
+      expect(nestedAsyncTracker2.innerDuration, const Duration(seconds: 4));
+      expect(nestedAsyncTracker2.slices.length, 1);
+    });
+
+    test('Can exclude nested async', () async {
+      tracker = asyncTracker = AsyncTimeTracker(trackNested: false);
+      await scopedTrack(() async {
+        time = time.add(const Duration(seconds: 1));
+        await nestedAsyncTracker.track(() async {
+          time = time.add(const Duration(seconds: 2));
+          await Future.value();
+          time = time.add(const Duration(seconds: 4));
+          await Future.value();
+          time = time.add(const Duration(seconds: 8));
+        });
+        time = time.add(const Duration(seconds: 16));
+      });
+      expect(asyncTracker.isFinished, true);
+      expect(asyncTracker.startTime, startTime);
+      expect(asyncTracker.stopTime, time);
+      expect(asyncTracker.duration, const Duration(seconds: 31));
+      expect(asyncTracker.innerDuration, const Duration(seconds: 17));
+      expect(asyncTracker.slices.length, greaterThan(1));
+      expect(nestedAsyncTracker.startTime.isAfter(startTime), true);
+      expect(nestedAsyncTracker.stopTime.isBefore(time), true);
+      expect(nestedAsyncTracker.duration, const Duration(seconds: 14));
+      expect(nestedAsyncTracker.innerDuration, const Duration(seconds: 14));
+      expect(nestedAsyncTracker.slices.length, greaterThan(1));
+    });
+
+    test('Can handle callbacks in excluded nested async', () async {
+      tracker = asyncTracker = AsyncTimeTracker(trackNested: false);
+      await scopedTrack(() async {
+        time = time.add(const Duration(seconds: 1));
+        final completer = Completer();
+        final future = completer.future.then((_) {
+          time = time.add(const Duration(seconds: 2));
+        });
+        await nestedAsyncTracker.track(() async {
+          time = time.add(const Duration(seconds: 4));
+          await Future.value();
+          time = time.add(const Duration(seconds: 8));
+          completer.complete();
+          await future;
+          time = time.add(const Duration(seconds: 16));
+        });
+        time = time.add(const Duration(seconds: 32));
+      });
+      expect(asyncTracker.isFinished, true);
+      expect(asyncTracker.startTime, startTime);
+      expect(asyncTracker.stopTime, time);
+      expect(asyncTracker.duration, const Duration(seconds: 63));
+      expect(asyncTracker.innerDuration, const Duration(seconds: 35));
+      expect(asyncTracker.slices.length, greaterThan(1));
+      expect(nestedAsyncTracker.startTime.isAfter(startTime), true);
+      expect(nestedAsyncTracker.stopTime.isBefore(time), true);
+      expect(nestedAsyncTracker.duration, const Duration(seconds: 30));
+      expect(nestedAsyncTracker.innerDuration, const Duration(seconds: 28));
+      expect(nestedAsyncTracker.slices.length, greaterThan(1));
+    });
+  });
+}