diff --git a/packages/flutter_tools/lib/src/android/gradle.dart b/packages/flutter_tools/lib/src/android/gradle.dart
index af9b3e8..0fcbd77 100644
--- a/packages/flutter_tools/lib/src/android/gradle.dart
+++ b/packages/flutter_tools/lib/src/android/gradle.dart
@@ -682,7 +682,7 @@
         .trim();
 
     // Extract build types and product flavors.
-    final Set<String> variants = Set<String>();
+    final Set<String> variants = <String>{};
     for (String s in tasks.split('\n')) {
       final Match match = _assembleTaskPattern.matchAsPrefix(s);
       if (match != null) {
@@ -691,8 +691,8 @@
           variants.add(variant);
       }
     }
-    final Set<String> buildTypes = Set<String>();
-    final Set<String> productFlavors = Set<String>();
+    final Set<String> buildTypes = <String>{};
+    final Set<String> productFlavors = <String>{};
     for (final String variant1 in variants) {
       for (final String variant2 in variants) {
         if (variant2.startsWith(variant1) && variant2 != variant1) {
diff --git a/packages/flutter_tools/lib/src/asset.dart b/packages/flutter_tools/lib/src/asset.dart
index 2918097..70e2ec7 100644
--- a/packages/flutter_tools/lib/src/asset.dart
+++ b/packages/flutter_tools/lib/src/asset.dart
@@ -320,7 +320,7 @@
   // example, a package might itself contain code from multiple third-party
   // sources, and might need to include a license for each one.)
   final Map<String, Set<String>> packageLicenses = <String, Set<String>>{};
-  final Set<String> allPackages = Set<String>();
+  final Set<String> allPackages = <String>{};
   for (String packageName in packageMap.map.keys) {
     final Uri package = packageMap.map[packageName];
     if (package != null && package.scheme == 'file') {
@@ -342,7 +342,7 @@
             packageNames = <String>[packageName];
             licenseText = rawLicense;
           }
-          packageLicenses.putIfAbsent(licenseText, () => Set<String>())
+          packageLicenses.putIfAbsent(licenseText, () => <String>{})
             ..addAll(packageNames);
           allPackages.addAll(packageNames);
         }
diff --git a/packages/flutter_tools/lib/src/base/build.dart b/packages/flutter_tools/lib/src/base/build.dart
index 8e60120..5c52534 100644
--- a/packages/flutter_tools/lib/src/base/build.dart
+++ b/packages/flutter_tools/lib/src/base/build.dart
@@ -118,7 +118,7 @@
     final String vmServicePath = fs.path.join(skyEnginePkg, 'sdk_ext', 'vmservice_io.dart');
 
     final List<String> inputPaths = <String>[uiPath, vmServicePath, mainPath];
-    final Set<String> outputPaths = Set<String>();
+    final Set<String> outputPaths = <String>{};
 
     final String depfilePath = fs.path.join(outputDir.path, 'snapshot.d');
     final List<String> genSnapshotArgs = <String>[
@@ -458,7 +458,7 @@
       genSnapshotArgs.addAll(extraGenSnapshotOptions);
     }
 
-    final Set<String> outputPaths = Set<String>();
+    final Set<String> outputPaths = <String>{};
     outputPaths.addAll(<String>[isolateSnapshotData]);
     if (!createPatch) {
       outputPaths.add(isolateSnapshotInstructions);
diff --git a/packages/flutter_tools/lib/src/base/utils.dart b/packages/flutter_tools/lib/src/base/utils.dart
index a309293..a18ae8b 100644
--- a/packages/flutter_tools/lib/src/base/utils.dart
+++ b/packages/flutter_tools/lib/src/base/utils.dart
@@ -146,7 +146,7 @@
 /// available.
 class ItemListNotifier<T> {
   ItemListNotifier() {
-    _items = Set<T>();
+    _items = <T>{};
   }
 
   ItemListNotifier.from(List<T> items) {
diff --git a/packages/flutter_tools/lib/src/commands/analyze_continuously.dart b/packages/flutter_tools/lib/src/commands/analyze_continuously.dart
index 1be67c6..4d79959 100644
--- a/packages/flutter_tools/lib/src/commands/analyze_continuously.dart
+++ b/packages/flutter_tools/lib/src/commands/analyze_continuously.dart
@@ -26,7 +26,7 @@
 
   String analysisTarget;
   bool firstAnalysis = true;
-  Set<String> analyzedPaths = Set<String>();
+  Set<String> analyzedPaths = <String>{};
   Map<String, List<AnalysisError>> analysisErrors = <String, List<AnalysisError>>{};
   Stopwatch analysisTimer;
   int lastErrorCount = 0;
diff --git a/packages/flutter_tools/lib/src/commands/channel.dart b/packages/flutter_tools/lib/src/commands/channel.dart
index 7716db8..dce73af 100644
--- a/packages/flutter_tools/lib/src/commands/channel.dart
+++ b/packages/flutter_tools/lib/src/commands/channel.dart
@@ -52,7 +52,7 @@
     // Beware: currentBranch could contain PII. See getBranchName().
     final String currentChannel = FlutterVersion.instance.channel;
     final String currentBranch = FlutterVersion.instance.getBranchName();
-    final Set<String> seenChannels = Set<String>();
+    final Set<String> seenChannels = <String>{};
     final List<String> rawOutput = <String>[];
 
     showAll = showAll || currentChannel != currentBranch;
diff --git a/packages/flutter_tools/lib/src/commands/create.dart b/packages/flutter_tools/lib/src/commands/create.dart
index faaf109..e3d1d0e 100644
--- a/packages/flutter_tools/lib/src/commands/create.dart
+++ b/packages/flutter_tools/lib/src/commands/create.dart
@@ -612,7 +612,7 @@
   return segments.join('.');
 }
 
-final Set<String> _packageDependencies = Set<String>.from(<String>[
+const Set<String> _packageDependencies = <String>{
   'analyzer',
   'args',
   'async',
@@ -639,7 +639,7 @@
   'utf',
   'watcher',
   'yaml',
-]);
+};
 
 /// Return null if the project name is legal. Return a validation message if
 /// we should disallow the project name.
diff --git a/packages/flutter_tools/lib/src/commands/ide_config.dart b/packages/flutter_tools/lib/src/commands/ide_config.dart
index e977779..2e14108 100644
--- a/packages/flutter_tools/lib/src/commands/ide_config.dart
+++ b/packages/flutter_tools/lib/src/commands/ide_config.dart
@@ -121,7 +121,7 @@
       return;
     }
 
-    final Set<String> manifest = Set<String>();
+    final Set<String> manifest = <String>{};
     final List<FileSystemEntity> flutterFiles = _flutterRoot.listSync(recursive: true);
     for (FileSystemEntity entity in flutterFiles) {
       final String relativePath = fs.path.relative(entity.path, from: _flutterRoot.absolute.path);
diff --git a/packages/flutter_tools/lib/src/commands/update_packages.dart b/packages/flutter_tools/lib/src/commands/update_packages.dart
index 76de432..254826a 100644
--- a/packages/flutter_tools/lib/src/commands/update_packages.dart
+++ b/packages/flutter_tools/lib/src/commands/update_packages.dart
@@ -200,7 +200,7 @@
       // First, collect up the explicit dependencies:
       final List<PubspecYaml> pubspecs = <PubspecYaml>[];
       final Map<String, PubspecDependency> dependencies = <String, PubspecDependency>{};
-      final Set<String> specialDependencies = Set<String>();
+      final Set<String> specialDependencies = <String>{};
       for (Directory directory in packages) { // these are all the directories with pubspec.yamls we care about
         printTrace('Reading pubspec.yaml from: ${directory.path}');
         PubspecYaml pubspec;
@@ -279,7 +279,7 @@
         for (PubspecDependency dependency in pubspec.dependencies) {
           if (dependency.kind == DependencyKind.normal) {
             tree._versions[package] = version;
-            tree._dependencyTree[package] ??= Set<String>();
+            tree._dependencyTree[package] ??= <String>{};
             tree._dependencyTree[package].add(dependency.name);
           }
         }
@@ -341,7 +341,7 @@
       throwToolExit('Package $to not found in the dependency tree.');
 
     final Queue<_DependencyLink> traversalQueue = Queue<_DependencyLink>();
-    final Set<String> visited = Set<String>();
+    final Set<String> visited = <String>{};
     final List<_DependencyLink> paths = <_DependencyLink>[];
 
     traversalQueue.addFirst(_DependencyLink(from: null, to: from));
@@ -625,8 +625,8 @@
   void apply(PubDependencyTree versions, Set<String> specialDependencies) {
     assert(versions != null);
     final List<String> output = <String>[]; // the string data to output to the file, line by line
-    final Set<String> directDependencies = Set<String>(); // packages this pubspec directly depends on (i.e. not transitive)
-    final Set<String> devDependencies = Set<String>();
+    final Set<String> directDependencies = <String>{}; // packages this pubspec directly depends on (i.e. not transitive)
+    final Set<String> devDependencies = <String>{};
     Section section = Section.other; // the section we're currently handling
 
     // the line number where we're going to insert the transitive dependencies.
@@ -723,8 +723,8 @@
     final List<String> transitiveDevDependencyOutput = <String>[];
 
     // Which dependencies we need to handle for the transitive and dev dependency sections.
-    final Set<String> transitiveDependencies = Set<String>();
-    final Set<String> transitiveDevDependencies = Set<String>();
+    final Set<String> transitiveDependencies = <String>{};
+    final Set<String> transitiveDevDependencies = <String>{};
 
     // Merge the lists of dependencies we've seen in this file from dependencies, dev dependencies,
     // and the dependencies we know this file mentions that are already pinned
@@ -735,7 +735,7 @@
 
     // Create a new set to hold the list of packages we've already processed, so
     // that we don't redundantly process them multiple times.
-    final Set<String> done = Set<String>();
+    final Set<String> done = <String>{};
     for (String package in directDependencies)
       transitiveDependencies.addAll(versions.getTransitiveDependenciesFor(package, seen: done, exclude: implied));
     for (String package in devDependencies)
@@ -752,7 +752,7 @@
       transitiveDevDependencyOutput.add('  $package: ${versions.versionFor(package)} $kTransitiveMagicString');
 
     // Build a sorted list of all dependencies for the checksum.
-    final Set<String> checksumDependencies = Set<String>()
+    final Set<String> checksumDependencies = <String>{}
       ..addAll(directDependencies)
       ..addAll(devDependencies)
       ..addAll(transitiveDependenciesAsList)
diff --git a/packages/flutter_tools/lib/src/dependency_checker.dart b/packages/flutter_tools/lib/src/dependency_checker.dart
index bcc9407..8f0aea7 100644
--- a/packages/flutter_tools/lib/src/dependency_checker.dart
+++ b/packages/flutter_tools/lib/src/dependency_checker.dart
@@ -11,7 +11,7 @@
   DependencyChecker(this.builder, this.assets);
 
   final DartDependencySetBuilder builder;
-  final Set<String> _dependencies = Set<String>();
+  final Set<String> _dependencies = <String>{};
   final AssetBundle assets;
 
   /// Returns [true] if any components have been modified after [threshold] or
diff --git a/packages/flutter_tools/lib/src/devfs.dart b/packages/flutter_tools/lib/src/devfs.dart
index e6dabb1..7940e8b 100644
--- a/packages/flutter_tools/lib/src/devfs.dart
+++ b/packages/flutter_tools/lib/src/devfs.dart
@@ -403,7 +403,7 @@
   final Directory rootDirectory;
   String _packagesFilePath;
   final Map<Uri, DevFSContent> _entries = <Uri, DevFSContent>{};
-  final Set<String> assetPathsToEvict = Set<String>();
+  final Set<String> assetPathsToEvict = <String>{};
 
   final List<Future<Map<String, dynamic>>> _pendingOperations =
       <Future<Map<String, dynamic>>>[];
@@ -533,7 +533,7 @@
     // run with no changes is supposed to be fast (considering that it is
     // initiated by user key press).
     final List<String> invalidatedFiles = <String>[];
-    final Set<Uri> filesUris = Set<Uri>();
+    final Set<Uri> filesUris = <Uri>{};
     for (Uri uri in dirtyEntries.keys.toList()) {
       if (!uri.path.startsWith(assetBuildDirPrefix)) {
         final DevFSContent content = dirtyEntries[uri];
diff --git a/packages/flutter_tools/lib/src/flutter_manifest.dart b/packages/flutter_tools/lib/src/flutter_manifest.dart
index 0c094f7..7b39071 100644
--- a/packages/flutter_tools/lib/src/flutter_manifest.dart
+++ b/packages/flutter_tools/lib/src/flutter_manifest.dart
@@ -391,9 +391,9 @@
   if (fonts == null) {
     return;
   }
-  final Set<int> fontWeights = Set<int>.from(const <int>[
+  const Set<int> fontWeights = <int>{
     100, 200, 300, 400, 500, 600, 700, 800, 900,
-  ]);
+  };
   for (final YamlMap fontMap in fonts) {
     for (dynamic key in fontMap.keys.where((dynamic key) => key != 'family' && key != 'fonts')) {
       errors.add('Unexpected child "$key" found under "fonts".');
diff --git a/packages/flutter_tools/lib/src/ios/mac.dart b/packages/flutter_tools/lib/src/ios/mac.dart
index 648547e..b45f4fe 100644
--- a/packages/flutter_tools/lib/src/ios/mac.dart
+++ b/packages/flutter_tools/lib/src/ios/mac.dart
@@ -733,7 +733,7 @@
 
   final RegExp oldAssets = RegExp(r'\/\* (flutter_assets|app\.flx)');
   final StringBuffer buffer = StringBuffer();
-  final Set<String> printedStatuses = Set<String>();
+  final Set<String> printedStatuses = <String>{};
 
   for (final String line in lines) {
     final Match match = oldAssets.firstMatch(line);
diff --git a/packages/flutter_tools/lib/src/version.dart b/packages/flutter_tools/lib/src/version.dart
index e196816..db71d60 100644
--- a/packages/flutter_tools/lib/src/version.dart
+++ b/packages/flutter_tools/lib/src/version.dart
@@ -43,12 +43,12 @@
   String _repositoryUrl;
   String get repositoryUrl => _repositoryUrl;
 
-  static Set<String> officialChannels = Set<String>.from(<String>[
+  static const Set<String> officialChannels = <String>{
     'master',
     'dev',
     'beta',
     'stable',
-  ]);
+  };
 
   /// This maps old branch names to the names of branches that replaced them.
   ///
diff --git a/packages/flutter_tools/lib/src/vmservice.dart b/packages/flutter_tools/lib/src/vmservice.dart
index f0d69eb..8a5a711 100644
--- a/packages/flutter_tools/lib/src/vmservice.dart
+++ b/packages/flutter_tools/lib/src/vmservice.dart
@@ -272,7 +272,7 @@
   final Map<String, StreamController<ServiceEvent>> _eventControllers =
       <String, StreamController<ServiceEvent>>{};
 
-  final Set<String> _listeningFor = Set<String>();
+  final Set<String> _listeningFor = <String>{};
 
   /// Whether our connection to the VM service has been closed;
   bool get isClosed => _peer.isClosed;
@@ -749,7 +749,7 @@
 
   void _removeDeadIsolates(List<Isolate> newIsolates) {
     // Build a set of new isolates.
-    final Set<String> newIsolateSet = Set<String>();
+    final Set<String> newIsolateSet = <String>{};
     for (Isolate iso in newIsolates)
       newIsolateSet.add(iso.id);