Stop reading .packages from flutter_tools. (#154912)

packages/flutter_tools/lib/src/cache.dart

@@ -215,8 +215,9 @@ class Cache {
   ///   1. FLUTTER_ROOT environment variable contains the path.
   ///   2. Platform script is a data URI scheme, returning `../..` to support
   ///      tests run from `packages/flutter_tools`.
-  ///   3. Platform script is package URI scheme, returning the grandparent directory
+  ///   3. Platform script is package URI scheme, returning the grandgrandparent
-  ///      of the package config file location from `packages/flutter_tools/.packages`.
+  ///      directory of the package config file location from
+  ///      `packages/flutter_tools/.dart_tool/package_config.json`.
   ///   4. Platform script file path is the snapshot path generated by `bin/flutter`,
   ///      returning the grandparent directory from `bin/cache`.
   ///   5. Platform script file name is the entrypoint in `packages/flutter_tools/bin/flutter_tools.dart`,
@@ -246,7 +247,7 @@ class Cache {
         final String packageConfigPath = Uri.parse(platform.packageConfig!).toFilePath(
           windows: platform.isWindows,
         );
-        return normalize(dirname(dirname(dirname(packageConfigPath))));
+        return normalize(dirname(dirname(dirname(dirname(packageConfigPath)))));
       }
 
       if (platform.script.scheme == 'file') {

packages/flutter_tools/lib/src/dart/package_map.dart

@@ -33,12 +33,6 @@ File? findPackageConfigFile(Directory dir) {
     if (candidatePackageConfigFile.existsSync()) {
       return candidatePackageConfigFile;
     }
-    // TODO(sigurdm): we should not need to check this file, it is obsolete,
-    // https://github.com/flutter/flutter/issues/150908.
-    final File candidatePackagesFile = candidateDir.childFile('.packages');
-    if (candidatePackagesFile.existsSync()) {
-      return candidatePackagesFile;
-    }
     final Directory parentDir = candidateDir.parent;
     if (fileSystem.identicalSync(parentDir.path, candidateDir.path)) {
       return null;

packages/flutter_tools/test/commands.shard/hermetic/build_ios_test.dart

@@ -98,7 +98,7 @@ void main() {
   // Sets up the minimal mock project files necessary to look like a Flutter project.
   void createCoreMockProjectFiles() {
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
   }
 
@@ -264,7 +264,7 @@ void main() {
       osUtils: FakeOperatingSystemUtils(),
     );
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('lib', 'main.dart'))
       .createSync(recursive: true);
 

packages/flutter_tools/test/commands.shard/hermetic/build_ipa_test.dart

@@ -108,7 +108,7 @@ void main() {
   // Sets up the minimal mock project files necessary to look like a Flutter project.
   void createCoreMockProjectFiles() {
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
   }
 
@@ -277,7 +277,7 @@ void main() {
       osUtils: FakeOperatingSystemUtils(),
     );
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('lib', 'main.dart'))
       .createSync(recursive: true);
 

packages/flutter_tools/test/commands.shard/hermetic/build_linux_test.dart

@@ -74,7 +74,7 @@ void main() {
   // Creates the mock files necessary to look like a Flutter project.
   void setUpMockCoreProjectFiles() {
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
   }
 
@@ -664,7 +664,7 @@ project(runner LANGUAGES CXX)
 set(BINARY_NAME "fizz_bar")
 ''');
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     final FlutterProject flutterProject = FlutterProject.fromDirectoryTest(fileSystem.currentDirectory);
 
     expect(getCmakeExecutableName(flutterProject.linux), 'fizz_bar');

packages/flutter_tools/test/commands.shard/hermetic/build_web_test.dart

@@ -47,7 +47,7 @@ void main() {
     fileSystem.file('pubspec.yaml')
       ..createSync()
       ..writeAsStringSync('name: foo\n');
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('web', 'index.html')).createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
     artifacts = Artifacts.test(fileSystem: fileSystem);
@@ -430,10 +430,28 @@ void setupFileSystemForEndToEndTest(FileSystem fileSystem) {
   }
 
   // Project files.
-  fileSystem.file('.packages')
+  fileSystem
-      .writeAsStringSync('''
+    .directory('.dart_tool')
-foo:lib/
+    .childFile('package_config.json')
-fizz:bar/lib/
+      ..createSync(recursive: true)
+      ..writeAsStringSync('''
+{
+  "packages": [
+    {
+      "name": "foo",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "3.2"
+    },
+    {
+      "name": "fizz",
+      "rootUri": "../bar",
+      "packageUri": "lib/",
+      "languageVersion": "3.2"
+    }
+  ],
+  "configVersion": 2
+}
 ''');
   fileSystem.file('pubspec.yaml')
       .writeAsStringSync('''

packages/flutter_tools/test/commands.shard/hermetic/build_windows_test.dart

@@ -65,7 +65,7 @@ void main() {
   // Creates the mock files necessary to look like a Flutter project.
   void setUpMockCoreProjectFiles() {
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
   }
 

packages/flutter_tools/test/commands.shard/hermetic/clean_test.dart

@@ -75,7 +75,13 @@ void main() {
 
         expect(projectUnderTest.flutterPluginsFile, isNot(exists));
         expect(projectUnderTest.flutterPluginsDependenciesFile, isNot(exists));
-        expect(projectUnderTest.directory.childFile('.packages'), isNot(exists));
+        expect(
+          projectUnderTest
+            .directory
+            .childDirectory('.dart_tool')
+            .childFile('package_config.json'),
+          isNot(exists),
+        );
 
         expect(xcodeProjectInterpreter.workspaces, const <CleanWorkspaceCall>[
           CleanWorkspaceCall('/ios/Runner.xcworkspace', 'Runner', false),
@@ -231,7 +237,7 @@ FlutterProject setupProjectUnderTest(Directory currentDirectory, bool setupXcode
     projectUnderTest.macos.hostAppRoot.childDirectory('Runner.xcworkspace').createSync(recursive: true);
   }
   projectUnderTest.dartTool.createSync(recursive: true);
-  projectUnderTest.directory.childFile('.packages').createSync(recursive: true);
+  projectUnderTest.directory.childDirectory('.dart_tool').childFile('package_config.jon').createSync(recursive: true);
   projectUnderTest.android.ephemeralDirectory.createSync(recursive: true);
 
   projectUnderTest.ios.ephemeralDirectory.createSync(recursive: true);

packages/flutter_tools/test/commands.shard/hermetic/create_usage_test.dart

@@ -40,7 +40,7 @@ class FakePub extends Fake implements Pub {
     bool shouldSkipThirdPartyGenerator = true,
     PubOutputMode outputMode = PubOutputMode.all,
   }) async {
-    project.directory.childFile('.packages').createSync();
+    project.directory.childDirectory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     if (offline) {
       calledGetOffline += 1;
     } else {

packages/flutter_tools/test/commands.shard/hermetic/pub_test.dart

@@ -83,7 +83,6 @@ void main() {
     fileSystem.currentDirectory.childFile('pubspec.yaml').createSync();
     fileSystem.currentDirectory.childFile('.flutter-plugins').createSync();
     fileSystem.currentDirectory.childFile('.flutter-plugins-dependencies').createSync();
-    fileSystem.currentDirectory.childFile('.packages').writeAsBytesSync(<int>[0]);
     fileSystem.currentDirectory.childFile('.dart_tool/package_config.json')
       ..createSync(recursive: true)
       ..writeAsBytesSync(<int>[0]);

packages/flutter_tools/test/commands.shard/permeable/build_bundle_test.dart

@@ -122,7 +122,6 @@ void main() {
   testUsingContext('bundle fails to build for Windows if feature is disabled', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync(recursive: true);
-    globals.fs.file('.packages').createSync(recursive: true);
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -142,7 +141,6 @@ void main() {
   testUsingContext('bundle fails to build for Linux if feature is disabled', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -162,7 +160,6 @@ void main() {
   testUsingContext('bundle fails to build for macOS if feature is disabled', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -182,7 +179,6 @@ void main() {
   testUsingContext('bundle --tree-shake-icons fails', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -201,7 +197,6 @@ void main() {
   testUsingContext('bundle can build for Windows if feature is enabled', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -221,7 +216,6 @@ void main() {
   testUsingContext('bundle can build for Linux if feature is enabled', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -241,7 +235,6 @@ void main() {
   testUsingContext('bundle can build for macOS if feature is enabled', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -261,7 +254,7 @@ void main() {
   testUsingContext('passes track widget creation through', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
+
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -294,7 +287,6 @@ void main() {
   testUsingContext('passes dart-define through', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -328,7 +320,6 @@ void main() {
   testUsingContext('passes filesystem-scheme through', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -361,7 +352,6 @@ void main() {
   testUsingContext('passes filesystem-roots through', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -395,7 +385,6 @@ void main() {
   testUsingContext('passes extra frontend-options through', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -429,7 +418,6 @@ void main() {
   testUsingContext('passes extra gen_snapshot-options through', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -463,7 +451,6 @@ void main() {
   testUsingContext('passes profile options through', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));
@@ -505,7 +492,6 @@ void main() {
   testUsingContext('passes release options through', () async {
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml').createSync();
-    globals.fs.file('.packages').createSync();
     final CommandRunner<void> runner = createTestCommandRunner(BuildBundleCommand(
       logger: BufferLogger.test(),
     ));

packages/flutter_tools/test/general.shard/android/android_device_test.dart

@@ -189,7 +189,6 @@ name: example
 flutter:
   module: {}
 ''');
-    fileSystem.file('.packages').createSync();
     final FlutterProject flutterProject = FlutterProjectFactory(
       fileSystem: fileSystem,
       logger: BufferLogger.test(),
@@ -202,7 +201,6 @@ flutter:
   testWithoutContext('isSupportedForProject is true with editable host app', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     fileSystem.directory('android').createSync();
     final FlutterProject flutterProject = FlutterProjectFactory(
       fileSystem: fileSystem,
@@ -217,7 +215,6 @@ flutter:
   testWithoutContext('isSupportedForProject is false with no host app and no module', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     final FlutterProject flutterProject = FlutterProjectFactory(
       fileSystem: fileSystem,
       logger: BufferLogger.test(),

packages/flutter_tools/test/general.shard/application_package_test.dart

@@ -424,7 +424,6 @@ void main() {
 
     testUsingContext('returns null when there is no ios or .ios directory', () async {
       globals.fs.file('pubspec.yaml').createSync();
-      globals.fs.file('.packages').createSync();
       final BuildableIOSApp? iosApp = await IOSApp.fromIosProject(
         FlutterProject.fromDirectory(globals.fs.currentDirectory).ios, null) as BuildableIOSApp?;
 
@@ -433,7 +432,6 @@ void main() {
 
     testUsingContext('returns null when there is no Runner.xcodeproj', () async {
       globals.fs.file('pubspec.yaml').createSync();
-      globals.fs.file('.packages').createSync();
       globals.fs.file('ios/FooBar.xcodeproj').createSync(recursive: true);
       final BuildableIOSApp? iosApp = await IOSApp.fromIosProject(
         FlutterProject.fromDirectory(globals.fs.currentDirectory).ios, null) as BuildableIOSApp?;
@@ -443,7 +441,6 @@ void main() {
 
     testUsingContext('returns null when there is no Runner.xcodeproj/project.pbxproj', () async {
       globals.fs.file('pubspec.yaml').createSync();
-      globals.fs.file('.packages').createSync();
       globals.fs.file('ios/Runner.xcodeproj').createSync(recursive: true);
       final BuildableIOSApp? iosApp = await IOSApp.fromIosProject(
         FlutterProject.fromDirectory(globals.fs.currentDirectory).ios, null) as BuildableIOSApp?;
@@ -453,7 +450,6 @@ void main() {
 
     testUsingContext('returns null when there with no product identifier', () async {
       globals.fs.file('pubspec.yaml').createSync();
-      globals.fs.file('.packages').createSync();
       final Directory project = globals.fs.directory('ios/Runner.xcodeproj')..createSync(recursive: true);
       project.childFile('project.pbxproj').createSync();
       final BuildableIOSApp? iosApp = await IOSApp.fromIosProject(

packages/flutter_tools/test/general.shard/asset_bundle_flavors_test.dart

@@ -32,7 +32,7 @@ void main() {
     );
 
     await bundle.build(
-      packageConfigPath: '.packages',
+      packageConfigPath: '.dart_tool/package_config.json',
       flutterProject: FlutterProject.fromDirectoryTest(fileSystem.currentDirectory),
       flavor: flavor,
     );
@@ -45,7 +45,7 @@ void main() {
     final BufferLogger logger = BufferLogger.test();
     final FakePlatform platform = FakePlatform();
 
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('assets', 'common', 'image.png')).createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('assets', 'vanilla', 'ice-cream.png')).createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('assets', 'strawberry', 'ice-cream.png')).createSync(recursive: true);
@@ -108,7 +108,7 @@ flutter:
     fileSystem.currentDirectory = fileSystem.systemTempDirectory.createTempSync('flutter_asset_bundle_test.');
     final BufferLogger logger = BufferLogger.test();
     final FakePlatform platform = FakePlatform();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('assets', 'unflavored.png')).createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('assets', 'vanillaOrange.png')).createSync(recursive: true);
 
@@ -145,7 +145,7 @@ flutter:
     fileSystem.currentDirectory = fileSystem.systemTempDirectory.createTempSync('flutter_asset_bundle_test.');
     final BufferLogger logger = BufferLogger.test();
     final FakePlatform platform = FakePlatform();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('vanilla', 'vanilla.png')).createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('vanilla', 'flavorless.png')).createSync(recursive: true);
 
@@ -180,7 +180,7 @@ flutter:
     fileSystem.currentDirectory = fileSystem.systemTempDirectory.createTempSync('flutter_asset_bundle_test.');
     final BufferLogger logger = BufferLogger.test();
     final FakePlatform platform = FakePlatform();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file('orange.png').createSync(recursive: true);
     fileSystem.file('pubspec.yaml')
       ..createSync()
@@ -215,7 +215,7 @@ flutter:
     fileSystem.currentDirectory = fileSystem.systemTempDirectory.createTempSync('flutter_asset_bundle_test.');
     final BufferLogger logger = BufferLogger.test();
     final FakePlatform platform = FakePlatform();
-    fileSystem.file('.packages').createSync();
+    fileSystem.directory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('vanilla', 'actually-strawberry.png')).createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('vanilla', 'vanilla.png')).createSync(recursive: true);
 

packages/flutter_tools/test/general.shard/asset_bundle_package_fonts_test.dart

@@ -46,10 +46,25 @@ $fontsSection
 ''');
   }
 
-  void writePackagesFile(String packages) {
+  void writePackageConfigFile(Map<String, String> packages) {
-    globals.fs.file('.packages')
+    globals.fs.directory('.dart_tool').childFile('package_config.json')
-      ..createSync()
+      ..createSync(recursive: true)
-      ..writeAsStringSync(packages);
+      ..writeAsStringSync(
+        json.encode(<String, dynamic>{
+          'packages': <dynamic>[
+            ...packages.entries.map((MapEntry<String, String> entry) {
+              return <String, dynamic>{
+                'name': entry.key,
+                'rootUri': '../${entry.value}',
+                'packageUri': 'lib/',
+                'languageVersion': '3.2',
+              };
+            }),
+          ],
+          'configVersion': 2,
+        },
+      ),
+    );
   }
 
   Future<void> buildAndVerifyFonts(
@@ -59,7 +74,7 @@ $fontsSection
     String expectedAssetManifest,
   ) async {
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-    await bundle.build(packageConfigPath: '.packages');
+    await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
 
     for (final String packageName in packages) {
       for (final String packageFont in packageFonts) {
@@ -106,11 +121,11 @@ $fontsSection
 
     testUsingContext('App includes neither font manifest nor fonts when no defines fonts', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile('p/p/pubspec.yaml', 'test_package');
 
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(<String>['AssetManifest.bin',
         'AssetManifest.json', 'FontManifest.json', 'NOTICES.Z']));
     }, overrides: <Type, Generator>{
@@ -125,7 +140,7 @@ $fontsSection
            - asset: packages/test_package/bar
 ''';
       writePubspecFile('pubspec.yaml', 'test', fontsSection: fontsSection);
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile('p/p/pubspec.yaml', 'test_package');
 
       const String font = 'bar';
@@ -152,7 +167,7 @@ $fontsSection
            - asset: a/bar
 ''';
       writePubspecFile('pubspec.yaml', 'test', fontsSection: fontsSection);
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile('p/p/pubspec.yaml', 'test_package');
 
       const String packageFont = 'bar';
@@ -176,7 +191,7 @@ $fontsSection
 
     testUsingContext('App uses package font with own font file', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       const String fontsSection = '''
        - family: foo
          fonts:
@@ -207,7 +222,12 @@ $fontsSection
 
     testUsingContext('App uses package font with font file from another package', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/\ntest_package2:p2/p/lib/');
+      writePackageConfigFile(
+        <String, String>{
+          'test_package': 'p/p/',
+          'test_package2': 'p2/p/',
+        },
+      );
       const String fontsSection = '''
        - family: foo
          fonts:
@@ -239,7 +259,7 @@ $fontsSection
 
     testUsingContext('App uses package font with properties and own font file', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       const String pubspec = '''
        - family: foo
@@ -281,7 +301,7 @@ $fontsSection
         'test',
         fontsSection: fontsSection,
       );
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile(
         'p/p/pubspec.yaml',
         'test_package',

packages/flutter_tools/test/general.shard/asset_bundle_package_test.dart

@@ -57,10 +57,25 @@ $assetsSection
 ''');
   }
 
-  void writePackagesFile(String packages) {
+void writePackageConfigFile(Map<String, String> packages) {
-    globals.fs.file('.packages')
+    globals.fs.directory('.dart_tool').childFile('package_config.json')
-      ..createSync()
+      ..createSync(recursive: true)
-      ..writeAsStringSync(packages);
+      ..writeAsStringSync(
+        json.encode(<String, dynamic>{
+          'packages': <dynamic>[
+            ...packages.entries.map((MapEntry<String, String> entry) {
+              return <String, dynamic>{
+                'name': entry.key,
+                'rootUri': '../${entry.value}',
+                'packageUri': 'lib/',
+                'languageVersion': '3.2',
+              };
+            }),
+          ],
+          'configVersion': 2,
+        },
+      ),
+    );
   }
 
   Map<Object, Object> assetManifestBinToJson(Map<Object, Object> manifest) {
@@ -78,7 +93,7 @@ $assetsSection
   ) async {
 
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-    await bundle.build(packageConfigPath: '.packages');
+    await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
 
     for (final String packageName in packages) {
       for (final String asset in assets) {
@@ -134,11 +149,11 @@ $assetsSection
   group('AssetBundle assets from packages', () {
     testUsingContext('No assets are bundled when the package has no assets', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile('p/p/pubspec.yaml', 'test_package');
 
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(
         <String>['NOTICES.Z', 'AssetManifest.json', 'AssetManifest.bin', 'FontManifest.json']));
       const String expectedAssetManifest = '{}';
@@ -157,14 +172,14 @@ $assetsSection
 
     testUsingContext('No assets are bundled when the package has an asset that is not listed', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile('p/p/pubspec.yaml', 'test_package');
 
       final List<String> assets = <String>['a/foo'];
       writeAssets('p/p/', assets);
 
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(
         <String>['NOTICES.Z', 'AssetManifest.json', 'AssetManifest.bin', 'FontManifest.json']));
       const String expectedAssetManifest = '{}';
@@ -184,7 +199,7 @@ $assetsSection
     testUsingContext('One asset is bundled when the package has and lists one '
       'asset its pubspec', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assets = <String>['a/foo'];
       writePubspecFile(
@@ -221,7 +236,7 @@ $assetsSection
         'test',
         assets: assetEntries,
       );
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile('p/p/pubspec.yaml', 'test_package');
 
       final List<String> assets = <String>['a/foo'];
@@ -246,7 +261,7 @@ $assetsSection
     testUsingContext('One asset and its variant are bundled when the package '
       'has an asset and a variant, and lists the asset in its pubspec', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile(
         'p/p/pubspec.yaml',
         'test_package',
@@ -283,7 +298,7 @@ $assetsSection
         'test',
         assets: <String>['packages/test_package/a/foo'],
       );
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
       writePubspecFile(
         'p/p/pubspec.yaml',
         'test_package',
@@ -312,7 +327,7 @@ $assetsSection
     testUsingContext('Two assets are bundled when the package has and lists '
       'two assets in its pubspec', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assets = <String>['a/foo', 'a/bar'];
       writePubspecFile(
@@ -351,7 +366,7 @@ $assetsSection
         'test',
          assets: assetEntries,
       );
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assets = <String>['a/foo', 'a/bar'];
       writePubspecFile(
@@ -384,7 +399,12 @@ $assetsSection
         'pubspec.yaml',
         'test',
       );
-      writePackagesFile('test_package:p/p/lib/\ntest_package2:p2/p/lib/');
+      writePackageConfigFile(
+        <String, String>{
+          'test_package': 'p/p/',
+          'test_package2': 'p2/p/',
+        },
+      );
       writePubspecFile(
         'p/p/pubspec.yaml',
         'test_package',
@@ -431,7 +451,12 @@ $assetsSection
         'test',
         assets: assetEntries,
       );
-      writePackagesFile('test_package:p/p/lib/\ntest_package2:p2/p/lib/');
+      writePackageConfigFile(
+        <String, String>{
+          'test_package': 'p/p/',
+          'test_package2': 'p2/p/',
+        },
+      );
       writePubspecFile(
         'p/p/pubspec.yaml',
         'test_package',
@@ -472,7 +497,12 @@ $assetsSection
         'pubspec.yaml',
         'test',
       );
-      writePackagesFile('test_package:p/p/lib/\ntest_package2:p2/p/lib/');
+      writePackageConfigFile(
+        <String, String>{
+          'test_package': 'p/p/',
+          'test_package2': 'p2/p/',
+        },
+      );
       writePubspecFile(
         'p/p/pubspec.yaml',
         'test_package',
@@ -506,7 +536,7 @@ $assetsSection
 
   testUsingContext('Asset paths can contain URL reserved characters', () async {
     writePubspecFile('pubspec.yaml', 'test');
-    writePackagesFile('test_package:p/p/lib/');
+    writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
     final List<String> assets = <String>['a/foo', 'a/foo [x]'];
     writePubspecFile(
@@ -538,7 +568,7 @@ $assetsSection
   group('AssetBundle assets from scanned paths', () {
     testUsingContext('Two assets are bundled when scanning their directory', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assetsOnDisk = <String>['a/foo', 'a/bar'];
       final List<String> assetsOnManifest = <String>['a/'];
@@ -571,7 +601,7 @@ $assetsSection
 
     testUsingContext('Two assets are bundled when listing one and scanning second directory', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assetsOnDisk = <String>['a/foo', 'abc/bar'];
       final List<String> assetOnManifest = <String>['a/foo', 'abc/'];
@@ -604,7 +634,7 @@ $assetsSection
 
     testUsingContext('One asset is bundled with variant, scanning wrong directory', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assetsOnDisk = <String>['a/foo','a/b/foo','a/bar'];
       final List<String> assetOnManifest = <String>['a','a/bar']; // can't list 'a' as asset, should be 'a/'
@@ -618,7 +648,7 @@ $assetsSection
       writeAssets('p/p/', assetsOnDisk);
 
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
 
       expect(bundle.entries['AssetManifest.json'], isNull,
         reason: 'Invalid pubspec.yaml should not generate AssetManifest.json'  );
@@ -631,7 +661,7 @@ $assetsSection
   group('AssetBundle assets from scanned paths with MemoryFileSystem', () {
     testUsingContext('One asset is bundled with variant, scanning directory', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assetsOnDisk = <String>['a/foo','a/2x/foo'];
       final List<String> assetOnManifest = <String>['a/',];
@@ -661,7 +691,7 @@ $assetsSection
 
     testUsingContext('No asset is bundled with variant, no assets or directories are listed', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assetsOnDisk = <String>['a/foo', 'a/2x/foo'];
       final List<String> assetOnManifest = <String>[];
@@ -687,7 +717,7 @@ $assetsSection
 
     testUsingContext('Expect error generating manifest, wrong non-existing directory is listed', () async {
       writePubspecFile('pubspec.yaml', 'test');
-      writePackagesFile('test_package:p/p/lib/');
+      writePackageConfigFile(<String, String>{'test_package': 'p/p/'});
 
       final List<String> assetOnManifest = <String>['c/'];
 
@@ -698,7 +728,7 @@ $assetsSection
       );
 
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-    await bundle.build(packageConfigPath: '.packages');
+    await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
     }, overrides: <Type, Generator>{
       FileSystem: () => testFileSystem,
       ProcessManager: () => FakeProcessManager.any(),

packages/flutter_tools/test/general.shard/asset_bundle_test.dart

@@ -27,6 +27,31 @@ import '../src/context.dart';
 void main() {
   const String shaderLibDir = '/./shader_lib';
 
+  File createPackageConfig(
+    FileSystem fileSystem, {
+      Map<String, String> packages = const <String, String>{},
+    }
+  ) {
+    final File file = fileSystem.directory('.dart_tool').childFile('package_config.json');
+    file.createSync(recursive: true);
+    file.writeAsStringSync(
+        json.encode(<String, dynamic>{
+          'packages': <dynamic>[
+            ...packages.entries.map((MapEntry<String, String> entry) {
+              return <String, dynamic>{
+                'name': entry.key,
+                'rootUri': '../${entry.value}',
+                'packageUri': 'lib/',
+                'languageVersion': '3.2',
+              };
+            }),
+          ],
+          'configVersion': 2,
+        },
+      ),
+    );
+    return file;
+  }
   group('AssetBundle.build (using context)', () {
     late FileSystem testFileSystem;
     late Platform platform;
@@ -39,7 +64,7 @@ void main() {
 
     testUsingContext('nonempty', () async {
       final AssetBundle ab = AssetBundleFactory.instance.createBundle();
-      expect(await ab.build(packageConfigPath: '.packages'), 0);
+      expect(await ab.build(packageConfigPath: '.dart_tool/package_config.json'), 0);
       expect(ab.entries.length, greaterThan(0));
     }, overrides: <Type, Generator>{
       FileSystem: () => testFileSystem,
@@ -53,7 +78,7 @@ void main() {
         ..writeAsStringSync('');
 
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys,
         unorderedEquals(<String>['AssetManifest.json', 'AssetManifest.bin'])
       );
@@ -75,7 +100,7 @@ void main() {
     });
 
     testUsingContext('wildcard directories do not include subdirectories', () async {
-      globals.fs.file('.packages').createSync();
+      createPackageConfig(globals.fs);
       globals.fs.file('pubspec.yaml').writeAsStringSync(
 '''
 name: test
@@ -104,7 +129,7 @@ flutter:
       }
 
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
 
       expect(bundle.entries.keys, unorderedEquals(<String>[
         'AssetManifest.json',
@@ -121,7 +146,7 @@ flutter:
     });
 
     testUsingContext('wildcard directories are updated when filesystem changes', () async {
-      final File packageFile = globals.fs.file('.packages')..createSync();
+      final File packageFile = createPackageConfig(globals.fs);
       globals.fs.file(globals.fs.path.join('assets', 'foo', 'bar.txt')).createSync(recursive: true);
       globals.fs.file('pubspec.yaml')
         ..createSync()
@@ -132,7 +157,7 @@ flutter:
     - assets/foo/
 ''');
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(<String>['AssetManifest.json',
         'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z', 'assets/foo/bar.txt']));
       // Simulate modifying the files by updating the filestat time manually.
@@ -141,7 +166,7 @@ flutter:
         ..setLastModifiedSync(packageFile.lastModifiedSync().add(const Duration(hours: 1)));
 
       expect(bundle.needsBuild(), true);
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(<String>['AssetManifest.json',
           'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z', 'assets/foo/bar.txt',
           'assets/foo/fizz.txt']));
@@ -161,9 +186,9 @@ flutter:
   assets:
     - assets/foo/
 ''');
-      globals.fs.file('.packages').createSync();
+      final File packageConfig = createPackageConfig(globals.fs);
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(<String>['AssetManifest.json',
         'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z', 'assets/foo/bar.txt']));
       expect(bundle.needsBuild(), false);
@@ -177,15 +202,14 @@ flutter:
 name: example''')
         ..setLastModifiedSync(modifiedTime);
 
-      // touch .packages to make sure its change time is after pubspec.yaml's
+      // touch the package config to make sure its change time is after pubspec.yaml's
-      globals.fs.file('.packages')
+      packageConfig.setLastModifiedSync(modifiedTime);
-        .setLastModifiedSync(modifiedTime);
 
       // Even though the previous file was removed, it is left in the
       // asset manifest and not updated. This is due to the devfs not
       // supporting file deletion.
       expect(bundle.needsBuild(), true);
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(<String>['AssetManifest.json',
         'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z', 'assets/foo/bar.txt']));
     }, overrides: <Type, Generator>{
@@ -208,9 +232,9 @@ flutter:
   assets:
     - assets/foo/
 ''');
-      globals.fs.file('.packages').createSync();
+      createPackageConfig(globals.fs);
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(<String>['AssetManifest.json',
         'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z', 'assets/foo/bar.txt']));
       expect(bundle.needsBuild(), false);
@@ -221,7 +245,7 @@ flutter:
     });
 
     testUsingContext('deferred assets are parsed', () async {
-      globals.fs.file('.packages').createSync();
+      createPackageConfig(globals.fs);
       globals.fs.file(globals.fs.path.join('assets', 'foo', 'bar.txt')).createSync(recursive: true);
       globals.fs.file(globals.fs.path.join('assets', 'bar', 'barbie.txt')).createSync(recursive: true);
       globals.fs.file(globals.fs.path.join('assets', 'wild', 'dash.txt')).createSync(recursive: true);
@@ -244,7 +268,7 @@ flutter:
         platform: globals.platform,
         splitDeferredAssets: true,
       ).createBundle();
-      await bundle.build(packageConfigPath: '.packages', deferredComponentsEnabled: true);
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json', deferredComponentsEnabled: true);
       expect(bundle.entries.keys, unorderedEquals(<String>['AssetManifest.json',
         'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z', 'assets/foo/bar.txt']));
       expect(bundle.deferredComponentsEntries.length, 1);
@@ -257,7 +281,7 @@ flutter:
     });
 
     testUsingContext('deferred assets are parsed regularly when splitDeferredAssets Disabled', () async {
-      globals.fs.file('.packages').createSync();
+      createPackageConfig(globals.fs);
       globals.fs.file(globals.fs.path.join('assets', 'foo', 'bar.txt')).createSync(recursive: true);
       globals.fs.file(globals.fs.path.join('assets', 'bar', 'barbie.txt')).createSync(recursive: true);
       globals.fs.file(globals.fs.path.join('assets', 'wild', 'dash.txt')).createSync(recursive: true);
@@ -275,7 +299,7 @@ flutter:
         - assets/wild/
 ''');
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages');
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
       expect(bundle.entries.keys, unorderedEquals(<String>['assets/foo/bar.txt',
         'assets/bar/barbie.txt', 'assets/wild/dash.txt', 'AssetManifest.json',
         'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z']));
@@ -288,7 +312,7 @@ flutter:
     });
 
     testUsingContext('deferred assets wildcard parsed', () async {
-      final File packageFile = globals.fs.file('.packages')..createSync();
+      final File packageFile = createPackageConfig(globals.fs);
       globals.fs.file(globals.fs.path.join('assets', 'foo', 'bar.txt')).createSync(recursive: true);
       globals.fs.file(globals.fs.path.join('assets', 'bar', 'barbie.txt')).createSync(recursive: true);
       globals.fs.file(globals.fs.path.join('assets', 'wild', 'dash.txt')).createSync(recursive: true);
@@ -311,7 +335,7 @@ flutter:
         platform: globals.platform,
         splitDeferredAssets: true,
       ).createBundle();
-      await bundle.build(packageConfigPath: '.packages', deferredComponentsEnabled: true);
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json', deferredComponentsEnabled: true);
       expect(bundle.entries.keys, unorderedEquals(<String>['assets/foo/bar.txt',
         'AssetManifest.json', 'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z']));
       expect(bundle.deferredComponentsEntries.length, 1);
@@ -324,7 +348,7 @@ flutter:
         ..setLastModifiedSync(packageFile.lastModifiedSync().add(const Duration(hours: 1)));
 
       expect(bundle.needsBuild(), true);
-      await bundle.build(packageConfigPath: '.packages', deferredComponentsEnabled: true);
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json', deferredComponentsEnabled: true);
 
       expect(bundle.entries.keys, unorderedEquals(<String>['assets/foo/bar.txt',
         'AssetManifest.json', 'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z']));
@@ -348,7 +372,7 @@ flutter:
         userMessages: UserMessages(),
       );
 
-      fileSystem.file('.packages').createSync();
+      createPackageConfig(fileSystem);
       fileSystem.file('pubspec.yaml')
         ..createSync()
         ..writeAsStringSync(r'''
@@ -366,7 +390,7 @@ flutter:
 
       expect(
         () => bundle.build(
-          packageConfigPath: '.packages',
+          packageConfigPath: '.dart_tool/package_config.json',
           flutterProject: FlutterProject.fromDirectoryTest(
             fileSystem.currentDirectory,
           ),
@@ -400,7 +424,7 @@ flutter:
         fileSystem: fileSystem,
         userMessages: UserMessages(),
       );
-      fileSystem.file('.packages').createSync();
+      createPackageConfig(fileSystem);
       fileSystem.file('pubspec.yaml')
         ..createSync()
         ..writeAsStringSync(r'''
@@ -418,7 +442,7 @@ flutter:
 
       expect(
         () => bundle.build(
-          packageConfigPath: '.packages',
+          packageConfigPath: '.dart_tool/package_config.json',
           flutterProject: FlutterProject.fromDirectoryTest(
             fileSystem.currentDirectory,
           ),
@@ -436,7 +460,7 @@ flutter:
 
       final BufferLogger logger = BufferLogger.test();
       final FakePlatform platform = FakePlatform();
-      fileSystem.file('.packages').createSync();
+      createPackageConfig(fileSystem);
       fileSystem.file('pubspec.yaml')
         ..createSync()
         ..writeAsStringSync(r'''
@@ -459,7 +483,7 @@ flutter:
       );
 
       await bundle.build(
-        packageConfigPath: '.packages',
+        packageConfigPath: '.dart_tool/package_config.json',
         flutterProject: FlutterProject.fromDirectoryTest(
           fileSystem.currentDirectory,
         ),
@@ -468,7 +492,7 @@ flutter:
       expect(bundle.entries['my-asset.txt']!.content.isModified, isTrue);
 
       await bundle.build(
-        packageConfigPath: '.packages',
+        packageConfigPath: '.dart_tool/package_config.json',
         flutterProject: FlutterProject.fromDirectoryTest(
           fileSystem.currentDirectory,
         ),
@@ -487,7 +511,7 @@ flutter:
 ''');
 
       await bundle.build(
-        packageConfigPath: '.packages',
+        packageConfigPath: '.dart_tool/package_config.json',
         flutterProject: FlutterProject.fromDirectoryTest(
           fileSystem.currentDirectory,
         ),
@@ -513,7 +537,7 @@ flutter:
         ..writeAsStringSync('');
 
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages', targetPlatform: TargetPlatform.web_javascript);
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json', targetPlatform: TargetPlatform.web_javascript);
 
       expect(bundle.entries.keys,
         unorderedEquals(<String>[
@@ -537,7 +561,7 @@ flutter:
     });
 
     testUsingContext('pubspec contains an asset', () async {
-      globals.fs.file('.packages').createSync();
+      createPackageConfig(globals.fs);
       globals.fs.file('pubspec.yaml').writeAsStringSync(r'''
 name: test
 dependencies:
@@ -552,7 +576,7 @@ flutter:
       ).createSync(recursive: true);
 
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-      await bundle.build(packageConfigPath: '.packages', targetPlatform: TargetPlatform.web_javascript);
+      await bundle.build(packageConfigPath: '.dart_tool/package_config.json', targetPlatform: TargetPlatform.web_javascript);
 
       expect(bundle.entries.keys,
         unorderedEquals(<String>[
@@ -618,7 +642,7 @@ flutter:
   });
 
   testUsingContext('does not unnecessarily recreate asset manifest, font manifest, license', () async {
-    globals.fs.file('.packages').createSync();
+    createPackageConfig(globals.fs);
     globals.fs.file(globals.fs.path.join('assets', 'foo', 'bar.txt')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml')
       ..createSync()
@@ -629,13 +653,13 @@ assets:
   - assets/foo/bar.txt
 ''');
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
-    await bundle.build(packageConfigPath: '.packages');
+    await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
 
     final AssetBundleEntry? assetManifest = bundle.entries['AssetManifest.json'];
     final AssetBundleEntry? fontManifest = bundle.entries['FontManifest.json'];
     final AssetBundleEntry? license = bundle.entries['NOTICES'];
 
-    await bundle.build(packageConfigPath: '.packages');
+    await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
 
     expect(assetManifest, bundle.entries['AssetManifest.json']);
     expect(fontManifest, bundle.entries['FontManifest.json']);
@@ -648,7 +672,7 @@ assets:
 
   testUsingContext('inserts dummy file into additionalDependencies when '
     'wildcards are used', () async {
-    globals.fs.file('.packages').createSync();
+    createPackageConfig(globals.fs);
     globals.fs.file(globals.fs.path.join('assets', 'bar.txt')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml')
       ..createSync()
@@ -660,7 +684,7 @@ flutter:
 ''');
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-    expect(await bundle.build(packageConfigPath: '.packages'), 0);
+    expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 0);
     expect(bundle.additionalDependencies.single.path, contains('DOES_NOT_EXIST_RERUN_FOR_WILDCARD'));
   }, overrides: <Type, Generator>{
     FileSystem: () => MemoryFileSystem.test(),
@@ -670,7 +694,7 @@ flutter:
 
   testUsingContext('Does not insert dummy file into additionalDependencies '
     'when wildcards are not used', () async {
-    globals.fs.file('.packages').createSync();
+    createPackageConfig(globals.fs);
     globals.fs.file(globals.fs.path.join('assets', 'bar.txt')).createSync(recursive: true);
     globals.fs.file('pubspec.yaml')
       ..createSync()
@@ -682,7 +706,7 @@ flutter:
 ''');
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-    expect(await bundle.build(packageConfigPath: '.packages'), 0);
+    expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 0);
     expect(bundle.additionalDependencies, isEmpty);
   }, overrides: <Type, Generator>{
     FileSystem: () => MemoryFileSystem.test(),
@@ -715,7 +739,7 @@ flutter:
     });
 
     testUsingContext('Including a shader triggers the shader compiler', () async {
-      fileSystem.file('.packages').createSync();
+      createPackageConfig(fileSystem);
       fileSystem.file('pubspec.yaml')
         ..createSync()
         ..writeAsStringSync(r'''
@@ -726,7 +750,7 @@ flutter:
   ''');
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-      expect(await bundle.build(packageConfigPath: '.packages'), 0);
+      expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 0);
 
       await writeBundle(
         output,
@@ -768,7 +792,7 @@ flutter:
     });
 
     testUsingContext('Included shaders are compiled for the web', () async {
-      fileSystem.file('.packages').createSync();
+      createPackageConfig(fileSystem);
       fileSystem.file('pubspec.yaml')
         ..createSync()
         ..writeAsStringSync(r'''
@@ -779,7 +803,7 @@ flutter:
   ''');
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-      expect(await bundle.build(packageConfigPath: '.packages', targetPlatform: TargetPlatform.web_javascript), 0);
+      expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json', targetPlatform: TargetPlatform.web_javascript), 0);
 
       await writeBundle(
         output,
@@ -820,7 +844,7 @@ flutter:
     });
 
     testUsingContext('Material shaders are compiled for the web', () async {
-      fileSystem.file('.packages').createSync();
+      createPackageConfig(fileSystem);
 
       final String materialIconsPath = fileSystem.path.join(
         getFlutterRoot(),
@@ -867,7 +891,7 @@ flutter:
   ''');
       final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-      expect(await bundle.build(packageConfigPath: '.packages', targetPlatform: TargetPlatform.web_javascript), 0);
+      expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json', targetPlatform: TargetPlatform.web_javascript), 0);
 
       await writeBundle(
         output,
@@ -891,10 +915,13 @@ flutter:
 
   testUsingContext('Does not insert dummy file into additionalDependencies '
     'when wildcards are used by dependencies', () async {
-    globals.fs.file('.packages').writeAsStringSync(r'''
+    createPackageConfig(
-example:lib/
+      globals.fs,
-foo:foo/lib/
+      packages: <String, String> {
-''');
+        'example': '',
+        'foo': 'foo',
+      },
+    );
     globals.fs.file(globals.fs.path.join('assets', 'foo', 'bar.txt'))
       .createSync(recursive: true);
     globals.fs.file('pubspec.yaml')
@@ -916,7 +943,7 @@ flutter:
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
     globals.fs.file('foo/bar/fizz.txt').createSync(recursive: true);
 
-    expect(await bundle.build(packageConfigPath: '.packages'), 0);
+    expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 0);
     expect(bundle.additionalDependencies, isEmpty);
   }, overrides: <Type, Generator>{
     FileSystem: () => MemoryFileSystem.test(),
@@ -925,10 +952,13 @@ flutter:
   });
 
   testUsingContext('does not track wildcard directories from dependencies', () async {
-    globals.fs.file('.packages').writeAsStringSync(r'''
+    createPackageConfig(
-example:lib/
+      globals.fs,
-foo:foo/lib/
+      packages: <String, String> {
-''');
+        'example': '',
+        'foo': 'foo',
+      },
+    );
     globals.fs.file(globals.fs.path.join('assets', 'foo', 'bar.txt'))
       .createSync(recursive: true);
     globals.fs.file('pubspec.yaml')
@@ -950,7 +980,7 @@ flutter:
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
     globals.fs.file('foo/bar/fizz.txt').createSync(recursive: true);
 
-    await bundle.build(packageConfigPath: '.packages');
+    await bundle.build(packageConfigPath: '.dart_tool/package_config.json');
 
       expect(bundle.entries.keys, unorderedEquals(<String>['packages/foo/bar/fizz.txt',
         'AssetManifest.json', 'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z']));
@@ -969,10 +999,13 @@ flutter:
 
   testUsingContext('reports package that causes asset bundle error when it is '
     'a dependency', () async {
-    globals.fs.file('.packages').writeAsStringSync(r'''
+    createPackageConfig(
-example:lib/
+      globals.fs,
-foo:foo/lib/
+      packages: <String, String> {
-''');
+        'example': '',
+        'foo': 'foo',
+      },
+    );
     globals.fs.file(globals.fs.path.join('assets', 'foo', 'bar.txt'))
       .createSync(recursive: true);
     globals.fs.file('pubspec.yaml')
@@ -993,7 +1026,7 @@ flutter:
 ''');
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-    expect(await bundle.build(packageConfigPath: '.packages'), 1);
+    expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 1);
     expect(testLogger.errorText, contains('This asset was included from package foo'));
   }, overrides: <Type, Generator>{
     FileSystem: () => MemoryFileSystem.test(),
@@ -1003,9 +1036,13 @@ flutter:
 
   testUsingContext('does not report package that causes asset bundle error '
     'when it is from own pubspec', () async {
-    globals.fs.file('.packages').writeAsStringSync(r'''
+    createPackageConfig(
-example:lib/
+      globals.fs,
-''');
+      packages: <String, String> {
+        'example': '',
+        'foo': 'foo',
+      },
+    );
     globals.fs.file('pubspec.yaml')
       ..createSync()
       ..writeAsStringSync(r'''
@@ -1016,7 +1053,7 @@ flutter:
 ''');
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-    expect(await bundle.build(packageConfigPath: '.packages'), 1);
+    expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 1);
     expect(testLogger.errorText, isNot(contains('This asset was included from')));
   }, overrides: <Type, Generator>{
     FileSystem: () => MemoryFileSystem.test(),
@@ -1026,10 +1063,13 @@ flutter:
 
   testUsingContext('does not include Material Design assets if uses-material-design: true is '
     'specified only by a dependency', () async {
-    globals.fs.file('.packages').writeAsStringSync(r'''
+    createPackageConfig(
-example:lib/
+      globals.fs,
-foo:foo/lib/
+      packages: <String, String> {
-''');
+        'example': '',
+        'foo': 'foo',
+      },
+    );
     globals.fs.file('pubspec.yaml')
       ..createSync()
       ..writeAsStringSync(r'''
@@ -1050,7 +1090,7 @@ flutter:
 ''');
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-    expect(await bundle.build(packageConfigPath: '.packages'), 0);
+    expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 0);
     expect((bundle.entries['FontManifest.json']!.content as DevFSStringContent).string, '[]');
     expect((bundle.entries['AssetManifest.json']!.content as DevFSStringContent).string, '{}');
     expect(testLogger.errorText, contains(
@@ -1063,9 +1103,12 @@ flutter:
   });
 
   testUsingContext('does not include assets in project directories as asset variants', () async {
-    globals.fs.file('.packages').writeAsStringSync(r'''
+    createPackageConfig(
-example:lib/
+      globals.fs,
-''');
+      packages: <String, String> {
+        'example': '',
+      },
+    );
     globals.fs.file('pubspec.yaml')
       ..createSync()
       ..writeAsStringSync(r'''
@@ -1087,7 +1130,7 @@ flutter:
 
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-    expect(await bundle.build(packageConfigPath: '.packages'), 0);
+    expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 0);
     expect(bundle.entries.keys, unorderedEquals(<String>['assets/foo.txt',
       'AssetManifest.json', 'AssetManifest.bin', 'FontManifest.json', 'NOTICES.Z']));
   }, overrides: <Type, Generator>{
@@ -1097,9 +1140,12 @@ flutter:
   });
 
   testUsingContext('deferred and regular assets are included in manifest alphabetically', () async {
-    globals.fs.file('.packages').writeAsStringSync(r'''
+    createPackageConfig(
-example:lib/
+      globals.fs,
-''');
+      packages: <String, String> {
+        'example': '',
+      },
+    );
     globals.fs.file('pubspec.yaml')
       ..createSync()
       ..writeAsStringSync(r'''
@@ -1122,7 +1168,7 @@ flutter:
     globals.fs.file('assets/zebra.jpg').createSync();
     final AssetBundle bundle = AssetBundleFactory.instance.createBundle();
 
-    expect(await bundle.build(packageConfigPath: '.packages'), 0);
+    expect(await bundle.build(packageConfigPath: '.dart_tool/package_config.json'), 0);
     expect((bundle.entries['FontManifest.json']!.content as DevFSStringContent).string, '[]');
     // The assets from deferred components and regular assets
     // are both included in alphabetical order

packages/flutter_tools/test/general.shard/asset_bundle_variant_test.dart

@@ -52,8 +52,14 @@ void main() {
         fileSystem: fs,
         userMessages: UserMessages(),
       );
-
+      fs.directory('.dart_tool').childFile('package_config.json')
-      fs.file('.packages').createSync();
+          ..createSync(recursive: true)
+          ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": []
+}
+''');
     });
 
     void createPubspec({
@@ -99,7 +105,7 @@ ${assets.map((String entry) => '    - $entry').join('\n')}
       );
 
       await bundle.build(
-        packageConfigPath: '.packages',
+        packageConfigPath: '.dart_tool/package_config.json',
         flutterProject:  FlutterProject.fromDirectoryTest(fs.currentDirectory),
       );
 
@@ -154,7 +160,7 @@ ${assets.map((String entry) => '    - $entry').join('\n')}
       );
 
       await bundle.build(
-        packageConfigPath: '.packages',
+        packageConfigPath: '.dart_tool/package_config.json',
         flutterProject:  FlutterProject.fromDirectoryTest(fs.currentDirectory),
       );
 
@@ -210,7 +216,7 @@ ${assets.map((String entry) => '    - $entry').join('\n')}
       );
 
       await bundle.build(
-        packageConfigPath: '.packages',
+        packageConfigPath: '.dart_tool/package_config.json',
         flutterProject:  FlutterProject.fromDirectoryTest(fs.currentDirectory),
       );
 
@@ -256,7 +262,7 @@ ${assets.map((String entry) => '    - $entry').join('\n')}
       );
 
       await bundle.build(
-        packageConfigPath: '.packages',
+        packageConfigPath: '.dart_tool/package_config.json',
         flutterProject:  FlutterProject.fromDirectoryTest(fs.currentDirectory),
       );
 
@@ -290,7 +296,14 @@ ${assets.map((String entry) => '    - $entry').join('\n')}
         userMessages: UserMessages()
       );
 
-      fs.file('.packages').createSync();
+      fs.directory('.dart_tool').childFile('package_config.json')
+          ..createSync(recursive: true)
+          ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": []
+}
+''');
 
       fs.file('pubspec.yaml').writeAsStringSync(
 '''
@@ -328,7 +341,7 @@ flutter:
       );
 
       await bundle.build(
-        packageConfigPath: '.packages',
+        packageConfigPath: '.dart_tool/package_config.json',
         flutterProject:  FlutterProject.fromDirectoryTest(fs.currentDirectory),
       );
 

packages/flutter_tools/test/general.shard/asset_test.dart

@@ -44,7 +44,7 @@ void main() {
       });
 
       testWithoutContext('app font uses local font file', () async {
-        final String packagesPath = fileSystem.path.join('main', '.packages');
+        final String packagesPath = fileSystem.path.join('main', '.dart_tool', 'package_config.json');
         final String manifestPath =
             fileSystem.path.join('main', 'pubspec.yaml');
         final ManifestAssetBundle assetBundle = ManifestAssetBundle(
@@ -137,13 +137,13 @@ dependencies:
         );
       });
 
-      testWithoutContext('handles empty pubspec with .packages', () async {
+      testWithoutContext('handles empty pubspec with .dart_tool/package_config.json', () async {
-        final String packagesPath = fileSystem.path.join('fuchsia_test', 'main', '.packages');
+        final String packageConfigPath = fileSystem.path.join('fuchsia_test', 'main', '.dart_tool', 'package_config.json');
         final String manifestPath =
             fileSystem.path.join('fuchsia_test', 'main', 'pubspec.yaml');
 
         fileSystem.directory(fileSystem.file(manifestPath)).parent.createSync(recursive: true);
-        fileSystem.directory(fileSystem.file(packagesPath)).parent.createSync(recursive: true);
+        fileSystem.directory(fileSystem.file(packageConfigPath)).parent.createSync(recursive: true);
 
         final ManifestAssetBundle assetBundle = ManifestAssetBundle(
           logger: logger,
@@ -155,7 +155,7 @@ dependencies:
 
         await assetBundle.build(
           manifestPath: manifestPath, // file doesn't exist
-          packageConfigPath: packagesPath,
+          packageConfigPath: packageConfigPath,
           flutterProject: FlutterProject.fromDirectoryTest(fileSystem.file(manifestPath).parent),
         );
 
@@ -203,7 +203,7 @@ dependencies:
         );
 
         await assetBundle.build(
-          packageConfigPath: '.packages',
+          packageConfigPath: '.dart_tool/package_config.json',
           targetPlatform: TargetPlatform.android_arm,
           flutterProject: FlutterProject.fromDirectoryTest(fileSystem.currentDirectory),
         );
@@ -248,7 +248,7 @@ dependencies:
         );
 
         await assetBundle.build(
-          packageConfigPath: '.packages',
+          packageConfigPath: '.dart_tool/package_config.json',
           targetPlatform: TargetPlatform.web_javascript,
           flutterProject: FlutterProject.fromDirectoryTest(fileSystem.currentDirectory),
         );

packages/flutter_tools/test/general.shard/build_system/targets/android_test.dart

@@ -185,7 +185,6 @@ void main() {
     ));
     environment.buildDir.createSync(recursive: true);
     environment.buildDir.childFile('app.dill').createSync();
-    environment.projectDir.childFile('.packages').writeAsStringSync('\n');
     const AndroidAot androidAot = AndroidAot(TargetPlatform.android_arm64, BuildMode.release);
 
     await androidAot.build(environment);
@@ -224,7 +223,6 @@ void main() {
     ));
     environment.buildDir.createSync(recursive: true);
     environment.buildDir.childFile('app.dill').createSync();
-    environment.projectDir.childFile('.packages').writeAsStringSync('\n');
     const AndroidAot androidAot = AndroidAot(TargetPlatform.android_arm64, BuildMode.release);
 
     await androidAot.build(environment);
@@ -266,7 +264,6 @@ void main() {
     ));
     environment.buildDir.createSync(recursive: true);
     environment.buildDir.childFile('app.dill').createSync();
-    environment.projectDir.childFile('.packages').writeAsStringSync('\n');
 
     await const AndroidAot(TargetPlatform.android_arm64, BuildMode.release)
       .build(environment);
@@ -304,7 +301,6 @@ void main() {
     ));
     environment.buildDir.createSync(recursive: true);
     environment.buildDir.childFile('app.dill').createSync();
-    environment.projectDir.childFile('.packages').writeAsStringSync('\n');
 
     await const AndroidAot(TargetPlatform.android_arm64, BuildMode.release)
       .build(environment);
@@ -529,7 +525,10 @@ void main() {
       .file(artifacts.getArtifactPath(Artifact.isolateSnapshotData, mode: BuildMode.debug))
       .createSync(recursive: true);
     fileSystem.file('pubspec.yaml').writeAsStringSync('name: hello\nflutter:\n  shaders:\n    - shader.glsl');
-    fileSystem.file('.packages').writeAsStringSync('\n');
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
     fileSystem.file('shader.glsl').writeAsStringSync('test');
 
     processManager.addCommands(<FakeCommand>[

packages/flutter_tools/test/general.shard/build_system/targets/assets_test.dart

@@ -49,8 +49,10 @@ void main() {
       .createSync(recursive: true);
     fileSystem.file('assets/wildcard/#bar.png')
       .createSync(recursive: true);
-    fileSystem.file('.packages')
+    fileSystem
-      .createSync();
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
     fileSystem.file('pubspec.yaml')
       ..createSync()
       ..writeAsStringSync('''
@@ -65,8 +67,22 @@ flutter:
   });
 
   testUsingContext('includes LICENSE file inputs in dependencies', () async {
-    fileSystem.file('.packages')
+    fileSystem
-      .writeAsStringSync('foo:file:///bar/lib');
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+        ..createSync(recursive: true)
+        ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "foo",
+      "rootUri": "file:///bar",
+      "packageUri": "lib/"
+    }
+  ]
+}
+''');
     fileSystem.file('bar/LICENSE')
       ..createSync(recursive: true)
       ..writeAsStringSync('THIS IS A LICENSE');
@@ -185,7 +201,10 @@ flutter:
       },
     );
 
-    await fileSystem.file('.packages').create();
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
 
     fileSystem.file('pubspec.yaml')
       ..createSync()
@@ -272,7 +291,10 @@ flutter:
       },
     );
 
-    await fileSystem.file('.packages').create();
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
 
     fileSystem.file('pubspec.yaml')
       ..createSync()
@@ -370,7 +392,10 @@ flutter:
       },
     );
 
-    await fileSystem.file('.packages').create();
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
 
     fileSystem.file('pubspec.yaml')
       ..createSync()

packages/flutter_tools/test/general.shard/build_system/targets/dart_plugin_registrant_test.dart

@@ -56,11 +56,6 @@ const String _kSamplePackageJson = '''
 }
 ''';
 
-const String _kSamplePackagesFile = '''
-path_provider_linux:/path_provider_linux/lib/
-path_provider_example:lib/
-''';
-
 const String _kSamplePubspecFile = '''
 name: path_provider_example
 description: Demonstrates how to use the path_provider plugin.
@@ -177,8 +172,6 @@ void main() {
 
       projectDir.childFile('pubspec.yaml').createSync();
 
-      projectDir.childFile('.packages').createSync();
-
       final FlutterProject testProject = FlutterProject.fromDirectoryTest(projectDir);
       await DartPluginRegistrantTarget.test(testProject).build(environment);
 
@@ -211,8 +204,6 @@ void main() {
 
       projectDir.childFile('pubspec.yaml').writeAsStringSync(_kSamplePubspecFile);
 
-      projectDir.childFile('.packages').writeAsStringSync(_kSamplePackagesFile);
-
       projectDir.childDirectory('lib').childFile('main.dart').createSync(recursive: true);
 
       environment.fileSystem.currentDirectory
@@ -289,8 +280,6 @@ void main() {
 
       final File pubspec = projectDir.childFile('pubspec.yaml')..writeAsStringSync(_kSamplePubspecFile);
 
-      final File packages = projectDir.childFile('.packages')..writeAsStringSync(_kSamplePackagesFile);
-
       environment.fileSystem.currentDirectory
           .childDirectory('path_provider_linux')
           .childFile('pubspec.yaml')
@@ -308,7 +297,6 @@ void main() {
 
       // Simulate a user removing everything from pubspec.yaml.
       pubspec.writeAsStringSync(_kEmptyPubspecFile);
-      packages.writeAsStringSync(_kEmptyPackageJson);
       config.writeAsStringSync(_kEmptyPackageJson);
 
       await DartPluginRegistrantTarget.test(testProject).build(environment);
@@ -337,8 +325,6 @@ void main() {
 
       projectDir.childFile('pubspec.yaml').writeAsStringSync(_kSamplePubspecFile);
 
-      projectDir.childFile('.packages').writeAsStringSync(_kSamplePackagesFile);
-
       projectDir.childDirectory('lib').childFile('main.dart').createSync(recursive: true);
 
       environment.fileSystem.currentDirectory

packages/flutter_tools/test/general.shard/build_system/targets/ios_test.dart

@@ -196,7 +196,10 @@ void main() {
       .createSync();
     // Project info
     fileSystem.file('pubspec.yaml').writeAsStringSync('name: hello');
-    fileSystem.file('.packages').writeAsStringSync('\n');
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
     // Plist file
     fileSystem.file(fileSystem.path.join('ios', 'Flutter', 'AppFrameworkInfo.plist'))
       .createSync(recursive: true);
@@ -271,7 +274,10 @@ void main() {
       .createSync();
     // Project info
     fileSystem.file('pubspec.yaml').writeAsStringSync('name: hello\nflutter:\n  shaders:\n    - shader.glsl');
-    fileSystem.file('.packages').writeAsStringSync('\n');
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
     // Plist file
     fileSystem.file(fileSystem.path.join('ios', 'Flutter', 'AppFrameworkInfo.plist'))
       .createSync(recursive: true);
@@ -341,7 +347,10 @@ void main() {
 
     // Project info
     fileSystem.file('pubspec.yaml').writeAsStringSync('name: hello');
-    fileSystem.file('.packages').writeAsStringSync('\n');
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
     // Plist file
     fileSystem.file(fileSystem.path.join('ios', 'Flutter', 'AppFrameworkInfo.plist'))
       .createSync(recursive: true);

packages/flutter_tools/test/general.shard/cache_test.dart

@@ -992,9 +992,6 @@ void main() {
 
     expect(await pubDependencies.isUpToDate(fileSystem), false); // no package config
 
-    fileSystem.file('packages/flutter_tools/.packages')
-      ..createSync(recursive: true)
-      ..writeAsStringSync('\n');
     fileSystem.file('packages/flutter_tools/.dart_tool/package_config.json')
       ..createSync(recursive: true)
       ..writeAsStringSync('''

packages/flutter_tools/test/general.shard/commands/flutter_root_test.dart

@@ -53,7 +53,7 @@ void main() {
         platform: FakePlatform(
             environment: <String, String>{},
             script: Uri.parse('package:flutter_tools/flutter_tools.dart'),
-            packageConfig: 'flutter/packages/flutter_tools/.packages'
+            packageConfig: 'flutter/packages/flutter_tools/.dart_tool/package_config.json'
         )
     );
 

packages/flutter_tools/test/general.shard/compile_batch_test.dart

@@ -64,7 +64,7 @@ void main() {
           '--enable-asserts',
           '--no-link-platform',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--verbosity=error',
           'file:///path/to/main.dart',
         ], completer: completer),
@@ -77,7 +77,7 @@ void main() {
       trackWidgetCreation: false,
       dartDefines: const <String>[],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
     );
     stdoutHandler.compilerOutput?.complete(const CompilerOutput('', 0, <Uri>[]));
     completer.complete();
@@ -109,7 +109,7 @@ void main() {
           '--enable-asserts',
           '--no-link-platform',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--verbosity=error',
           'file:///path/to/main.dart',
         ], completer: completer),
@@ -122,7 +122,7 @@ void main() {
       trackWidgetCreation: false,
       dartDefines: const <String>[],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
     );
     stdoutHandler.compilerOutput?.complete();
     completer.complete();
@@ -154,7 +154,7 @@ void main() {
           '--enable-asserts',
           '--no-link-platform',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--verbosity=error',
           'file:///path/to/main.dart',
         ], completer: completer, exitCode: 127),
@@ -167,7 +167,7 @@ void main() {
       trackWidgetCreation: false,
       dartDefines: const <String>[],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
     );
     stdoutHandler.compilerOutput?.complete(const CompilerOutput('', 0, <Uri>[]));
     completer.complete();
@@ -202,7 +202,7 @@ void main() {
           '--aot',
           '--tfa',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--verbosity=error',
           'file:///path/to/main.dart',
         ], completer: completer),
@@ -216,7 +216,7 @@ void main() {
       aot: true,
       dartDefines: const <String>[],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
     );
     stdoutHandler.compilerOutput?.complete(const CompilerOutput('', 0, <Uri>[]));
     completer.complete();
@@ -251,7 +251,7 @@ void main() {
           '--aot',
           '--tfa',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--verbosity=error',
           'file:///path/to/main.dart',
         ], completer: completer),
@@ -265,7 +265,7 @@ void main() {
       aot: true,
       dartDefines: const <String>[],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
     );
     stdoutHandler.compilerOutput?.complete(const CompilerOutput('', 0, <Uri>[]));
     completer.complete();
@@ -299,7 +299,7 @@ void main() {
           '--enable-asserts',
           '--no-link-platform',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--verbosity=error',
           'file:///path/to/main.dart',
         ], completer: completer),
@@ -313,7 +313,7 @@ void main() {
       trackWidgetCreation: false,
       dartDefines: const <String>['FOO=bar', 'BAZ=qux'],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
     );
 
     stdoutHandler.compilerOutput?.complete(const CompilerOutput('', 0, <Uri>[]));
@@ -348,7 +348,7 @@ void main() {
           '--enable-asserts',
           '--no-link-platform',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--verbosity=error',
           'scheme:///main.dart',
         ], completer: completer),
@@ -362,7 +362,7 @@ void main() {
       trackWidgetCreation: false,
       dartDefines: const <String>[],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
     );
 
     stdoutHandler.compilerOutput?.complete(const CompilerOutput('', 0, <Uri>[]));
@@ -397,7 +397,7 @@ void main() {
           '--enable-asserts',
           '--no-link-platform',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--source',
           '.dart_tools/flutter_build/dart_plugin_registrant.dart',
           '--source',
@@ -422,7 +422,7 @@ void main() {
       trackWidgetCreation: false,
       dartDefines: const <String>[],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
       buildDir: buildDir,
       checkDartPluginRegistry: true,
     );
@@ -456,7 +456,7 @@ void main() {
           '--enable-asserts',
           '--no-link-platform',
           '--packages',
-          '.packages',
+          '.dart_tool/package_config.json',
           '--native-assets',
           'path/to/native_assets.yaml',
           '--verbosity=error',
@@ -472,7 +472,7 @@ void main() {
       trackWidgetCreation: false,
       dartDefines: const <String>[],
       packageConfig: PackageConfig.empty,
-      packagesPath: '.packages',
+      packagesPath: '.dart_tool/package_config.json',
       nativeAssets: 'path/to/native_assets.yaml',
     );
     stdoutHandler.compilerOutput

packages/flutter_tools/test/general.shard/custom_devices/custom_device_test.dart

@@ -297,7 +297,10 @@ void main() {
   testWithoutContext('CustomDevice.isSupportedForProject is true with editable host app', () async {
     final MemoryFileSystem fileSystem = MemoryFileSystem.test();
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
 
     final FlutterProject flutterProject = _setUpFlutterProject(fileSystem.currentDirectory);
 

packages/flutter_tools/test/general.shard/hot_test.dart

@@ -132,9 +132,14 @@ void main() {
       });
 
       testUsingContext('setupHotRestart function fails', () async {
-        fileSystem.file('.packages')
+        fileSystem.directory('.dart_tool').childFile('package_config.json')
           ..createSync(recursive: true)
-          ..writeAsStringSync('\n');
+          ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": []
+}
+''');
         final FakeDevice device = FakeDevice();
         final List<FlutterDevice> devices = <FlutterDevice>[
           FakeFlutterDevice(device),
@@ -158,9 +163,14 @@ void main() {
       });
 
       testUsingContext('setupHotReload function fails', () async {
-        fileSystem.file('.packages')
+        fileSystem.directory('.dart_tool').childFile('package_config.json')
           ..createSync(recursive: true)
-          ..writeAsStringSync('\n');
+          ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": []
+}
+''');
         final FakeDevice device = FakeDevice();
         final FakeFlutterDevice fakeFlutterDevice = FakeFlutterDevice(device);
         final List<FlutterDevice> devices = <FlutterDevice>[
@@ -203,9 +213,14 @@ void main() {
       });
 
       testUsingContext('shutdown hook called after signal', () async {
-        fileSystem.file('.packages')
+        fileSystem.directory('.dart_tool').childFile('package_config.json')
           ..createSync(recursive: true)
-          ..writeAsStringSync('\n');
+          ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": []
+}
+''');
         final FakeDevice device = FakeDevice();
         final List<FlutterDevice> devices = <FlutterDevice>[
           FlutterDevice(device, generator: residentCompiler, buildInfo: BuildInfo.debug, developmentShaderCompiler: const FakeShaderCompiler()),
@@ -226,9 +241,14 @@ void main() {
       });
 
       testUsingContext('shutdown hook called after app stop', () async {
-        fileSystem.file('.packages')
+        fileSystem.directory('.dart_tool').childFile('package_config.json')
           ..createSync(recursive: true)
-          ..writeAsStringSync('\n');
+          ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": []
+}
+''');
         final FakeDevice device = FakeDevice();
         final List<FlutterDevice> devices = <FlutterDevice>[
           FlutterDevice(device, generator: residentCompiler, buildInfo: BuildInfo.debug, developmentShaderCompiler: const FakeShaderCompiler()),
@@ -545,9 +565,14 @@ void main() {
 
     testUsingContext('Exits with code 2 when HttpException is thrown '
       'during VM service connection', () async {
-      fileSystem.file('.packages')
+      fileSystem.directory('.dart_tool').childFile('package_config.json')
-        ..createSync(recursive: true)
+          ..createSync(recursive: true)
-        ..writeAsStringSync('\n');
+          ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": []
+}
+''');
 
       final FakeResidentCompiler residentCompiler = FakeResidentCompiler();
       final FakeDevice device = FakeDevice();

packages/flutter_tools/test/general.shard/ios/ios_device_project_test.dart

@@ -39,7 +39,6 @@ name: example
 flutter:
   module: {}
   ''');
-    fileSystem.file('.packages').writeAsStringSync('\n');
     final FlutterProject flutterProject =
       FlutterProject.fromDirectory(fileSystem.currentDirectory);
     final IOSDevice device = setUpIOSDevice(fileSystem);
@@ -53,7 +52,6 @@ flutter:
   testUsingContext('IOSDevice.isSupportedForProject is true with editable host app', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').writeAsStringSync('\n');
     fileSystem.directory('ios').createSync();
     final FlutterProject flutterProject =
       FlutterProject.fromDirectory(fileSystem.currentDirectory);
@@ -69,7 +67,6 @@ flutter:
   testUsingContext('IOSDevice.isSupportedForProject is false with no host app and no module', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').writeAsStringSync('\n');
     final FlutterProject flutterProject =
       FlutterProject.fromDirectory(fileSystem.currentDirectory);
     final IOSDevice device = setUpIOSDevice(fileSystem);

packages/flutter_tools/test/general.shard/ios/ios_device_start_nonprebuilt_test.dart

@@ -114,9 +114,6 @@ void main() {
       );
       fakeXcodeProjectInterpreter = FakeXcodeProjectInterpreter(projectInfo: projectInfo);
       xcode = Xcode.test(processManager: FakeProcessManager.any(), xcodeProjectInterpreter: fakeXcodeProjectInterpreter);
-      fileSystem.file('foo/.packages')
-        ..createSync(recursive: true)
-        ..writeAsStringSync('\n');
       fakeAnalytics = getInitializedFakeAnalyticsInstance(
         fs: fileSystem,
         fakeFlutterVersion: FakeFlutterVersion(),
@@ -421,9 +418,6 @@ void main() {
       );
       fakeXcodeProjectInterpreter = FakeXcodeProjectInterpreter(projectInfo: projectInfo);
       xcode = Xcode.test(processManager: FakeProcessManager.any(), xcodeProjectInterpreter: fakeXcodeProjectInterpreter);
-      fileSystem.file('foo/.packages')
-        ..createSync(recursive: true)
-        ..writeAsStringSync('\n');
     });
 
     group('in release mode', () {
@@ -920,7 +914,10 @@ void main() {
 
 void setUpIOSProject(FileSystem fileSystem, {bool createWorkspace = true}) {
   fileSystem.file('pubspec.yaml').createSync();
-  fileSystem.file('.packages').writeAsStringSync('\n');
+  fileSystem
+    .directory('.dart_tool')
+    .childFile('package_config.json')
+    .createSync(recursive: true);
   fileSystem.directory('ios').createSync();
   if (createWorkspace) {
     fileSystem.directory('ios/Runner.xcworkspace').createSync();

packages/flutter_tools/test/general.shard/ios/mac_test.dart

@@ -645,7 +645,6 @@ duplicate symbol '_$s29plugin_1_name23PluginNamePluginC9setDouble3key5valueySS_S
       final MemoryFileSystem fs = MemoryFileSystem.test();
       final FakeFlutterProject project = FakeFlutterProject(fileSystem: fs);
       project.ios.podfile.createSync(recursive: true);
-      project.directory.childFile('.packages').createSync(recursive: true);
       project.manifest = FakeFlutterManifest();
       createFakePlugins(project, fs, <String>['plugin_1_name', 'plugin_2_name']);
       fs.systemTempDirectory.childFile('cache/plugin_1_name/ios/plugin_1_name/Package.swift')

packages/flutter_tools/test/general.shard/ios/simulators_test.dart

@@ -1292,7 +1292,6 @@ name: example
 flutter:
   module: {}
 ''');
-      globals.fs.file('.packages').createSync();
       final FlutterProject flutterProject = FlutterProject.fromDirectoryTest(globals.fs.currentDirectory);
 
       final IOSSimulator simulator = IOSSimulator(
@@ -1312,7 +1311,6 @@ flutter:
 
     testUsingContext('is true with editable host app', () async {
       globals.fs.file('pubspec.yaml').createSync();
-      globals.fs.file('.packages').createSync();
       globals.fs.directory('ios').createSync();
       final FlutterProject flutterProject = FlutterProject.fromDirectoryTest(globals.fs.currentDirectory);
 
@@ -1332,7 +1330,6 @@ flutter:
 
     testUsingContext('is false with no host app and no module', () async {
       globals.fs.file('pubspec.yaml').createSync();
-      globals.fs.file('.packages').createSync();
       final FlutterProject flutterProject = FlutterProject.fromDirectoryTest(globals.fs.currentDirectory);
 
       final IOSSimulator simulator = IOSSimulator(

packages/flutter_tools/test/general.shard/isolated/resident_runner_test.dart

@@ -26,8 +26,6 @@ void main() {
 
   setUp(() {
     testbed = Testbed(setup: () {
-      globals.fs.file('.packages')
-        .writeAsStringSync('\n');
       globals.fs.file(globals.fs.path.join('build', 'app.dill'))
         ..createSync(recursive: true)
         ..writeAsStringSync('ABC');

packages/flutter_tools/test/general.shard/linux/linux_device_test.dart

@@ -119,7 +119,6 @@ void main() {
   testWithoutContext('LinuxDevice.isSupportedForProject is true with editable host app', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     fileSystem.directory('linux').createSync();
     final FlutterProject flutterProject = setUpFlutterProject(fileSystem.currentDirectory);
 
@@ -134,7 +133,6 @@ void main() {
   testWithoutContext('LinuxDevice.isSupportedForProject is false with no host app', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     final FlutterProject flutterProject = setUpFlutterProject(fileSystem.currentDirectory);
 
     expect(LinuxDevice(

packages/flutter_tools/test/general.shard/macos/macos_device_test.dart

@@ -173,7 +173,6 @@ void main() {
     );
 
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     fileSystem.directory('macos').createSync();
     final FlutterProject flutterProject = setUpFlutterProject(fileSystem.currentDirectory);
 
@@ -217,7 +216,6 @@ void main() {
       operatingSystemUtils: FakeOperatingSystemUtils(),
     );
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     final FlutterProject flutterProject = setUpFlutterProject(fileSystem.currentDirectory);
 
     expect(device.isSupportedForProject(flutterProject), false);

packages/flutter_tools/test/general.shard/plugins_test.dart

@@ -1863,7 +1863,7 @@ The Flutter Preview device does not support the following plugins from your pubs
         ..flutterPluginsDependenciesFile = dependenciesFile
         ..windows = windowsProject;
 
-      flutterProject.directory.childFile('.packages').createSync(recursive: true);
+      flutterProject.directory.childDirectory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
 
       const String dependenciesFileContents = r'''
 {
@@ -1993,7 +1993,7 @@ The Flutter Preview device does not support the following plugins from your pubs
           flutterProject.directory.childFile('.flutter-plugins-dependencies')
       ..windows = windowsProject;
 
-    flutterProject.directory.childFile('.packages').createSync(recursive: true);
+    flutterProject.directory.childDirectory('.dart_tool').childFile('package_config.json').createSync(recursive: true);
 
     createPluginSymlinks(
       flutterProject,

packages/flutter_tools/test/general.shard/resident_runner_test.dart

@@ -51,8 +51,6 @@ void main() {
 
   setUp(() {
     testbed = Testbed(setup: () {
-      globals.fs.file('.packages')
-        .writeAsStringSync('\n');
       globals.fs.file(globals.fs.path.join('build', 'app.dill'))
         ..createSync(recursive: true)
         ..writeAsStringSync('ABC');
@@ -1172,9 +1170,6 @@ dependencies:
     }
   ]
 }
-''');
-    globals.fs.file('.packages').writeAsStringSync('''
-path_provider_linux:/path_provider_linux/lib/
 ''');
     final Directory fakePluginDir = globals.fs.directory('path_provider_linux');
     final File pluginPubspec = fakePluginDir.childFile('pubspec.yaml');

packages/flutter_tools/test/general.shard/resident_web_runner_cold_test.dart

@@ -38,7 +38,10 @@ void main() {
     mockFlutterDevice = FakeFlutterDevice(mockWebDevice);
     mockFlutterDevice._devFS = mockWebDevFS;
 
-    fileSystem.file('.packages').writeAsStringSync('\n');
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
     fileSystem.file('pubspec.yaml').createSync();
     fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
     fileSystem.file(fileSystem.path.join('web', 'index.html')).createSync(recursive: true);

packages/flutter_tools/test/general.shard/resident_web_runner_test.dart

@@ -127,7 +127,10 @@ void main() {
       .._devFS = webDevFS
       ..device = mockDevice
       ..generator = residentCompiler;
-    fileSystem.file('.packages').writeAsStringSync('\n');
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
     fakeAnalytics = getInitializedFakeAnalyticsInstance(
       fs: fileSystem,
       fakeFlutterVersion: test_fakes.FakeFlutterVersion(),

packages/flutter_tools/test/general.shard/runner/flutter_command_runner_test.dart

@@ -213,9 +213,9 @@ void main() {
       testUsingContext("Doesn't crash on invalid .packages file", () async {
         final FlutterCommandRunner runner = createTestCommandRunner(DummyFlutterCommand()) as FlutterCommandRunner;
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages')
+        fileSystem.directory('.dart_tool').childFile('package_config.json')
-          ..createSync()
+          ..createSync(recursive: true)
-          ..writeAsStringSync('Not a valid package');
+          ..writeAsStringSync('Not a valid package config');
 
         await runner.run(<String>['dummy']);
 

packages/flutter_tools/test/general.shard/runner/flutter_command_test.dart

@@ -814,7 +814,6 @@ void main() {
       testUsingContext('parses values from JSON files and includes them in defines list', () async {
         fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         await fileSystem.file('config1.json').writeAsString(
           '''
             {
@@ -864,7 +863,6 @@ void main() {
           .file(fileSystem.path.join('lib', 'main.dart'))
           .createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         fileSystem.file('.env').writeAsStringSync('''
             MY_VALUE=VALUE_FROM_ENV_FILE
           ''');
@@ -893,7 +891,6 @@ void main() {
             .file(fileSystem.path.join('lib', 'main.dart'))
             .createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         await fileSystem.file('.env').writeAsString('''
             # comment
             kInt=1
@@ -956,7 +953,6 @@ void main() {
             .file(fileSystem.path.join('lib', 'main.dart'))
             .createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         await fileSystem.file('.env').writeAsString('what is this');
 
         await dummyCommandRunner.run(<String>[
@@ -982,7 +978,6 @@ void main() {
             .file(fileSystem.path.join('lib', 'main.dart'))
             .createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         await fileSystem.file('.env').writeAsString('''
             # single line value
             name=piotrfleury
@@ -1015,7 +1010,6 @@ void main() {
             .file(fileSystem.path.join('lib', 'main.dart'))
             .createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         await fileSystem.file('.env').writeAsString('''
             kInt=1
             kDouble=1.1
@@ -1053,7 +1047,6 @@ void main() {
       testUsingContext('when files contain entries with duplicate keys, uses the value from the lattermost file', () async {
         fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         await fileSystem.file('config1.json').writeAsString(
             '''
             {
@@ -1095,7 +1088,6 @@ void main() {
       testUsingContext('throws a ToolExit when the argued path points to a directory', () async {
         fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         fileSystem.directory('config').createSync();
 
         await dummyCommandRunner.run(<String>[
@@ -1115,7 +1107,6 @@ void main() {
       testUsingContext('throws a ToolExit when the given JSON file is malformed', () async {
         fileSystem.file(fileSystem.path.join('lib', 'main.dart')).createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         await fileSystem.file('config.json').writeAsString(
           '''
             {
@@ -1174,7 +1165,6 @@ void main() {
       testUsingContext("tool exits when FLUTTER_APP_FLAVOR is already set in user's environment", () async {
         fileSystem.file('lib/main.dart').createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
 
         final FakeDevice device = FakeDevice(
           'name',
@@ -1204,7 +1194,6 @@ void main() {
       testUsingContext('tool exits when FLUTTER_APP_FLAVOR is set in --dart-define or --dart-define-from-file', () async {
         fileSystem.file('lib/main.dart').createSync(recursive: true);
         fileSystem.file('pubspec.yaml').createSync();
-        fileSystem.file('.packages').createSync();
         fileSystem.file('config.json')..createSync()..writeAsStringSync('{"FLUTTER_APP_FLAVOR": "strawberry"}');
 
         final FakeDevice device = FakeDevice(

packages/flutter_tools/test/general.shard/runner/local_engine_test.dart

@@ -14,7 +14,7 @@ import '../../src/common.dart';
 
 const String kEngineRoot = '/flutter/engine';
 const String kArbitraryEngineRoot = '/arbitrary/engine';
-const String kDotPackages = '.packages';
+const String kPackageConfig = '.dart_tool/package_config.json';
 
 void main() {
   testWithoutContext('works if --local-engine is specified and --local-engine-src-path '
@@ -27,8 +27,20 @@ void main() {
       .directory('$kArbitraryEngineRoot/src/out/host_debug')
       .createSync(recursive: true);
     fileSystem
-      .file(kDotPackages)
+      .file(kPackageConfig)
-      .writeAsStringSync('sky_engine:file://$kArbitraryEngineRoot/src/out/ios_debug/gen/dart-pkg/sky_engine/lib/');
+        ..createSync(recursive: true)
+        ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "sky_engine",
+      "rootUri": "file://$kArbitraryEngineRoot/src/out/ios_debug/gen/dart-pkg/sky_engine",
+      "packageUri": "lib/"
+    }
+  ]
+}
+''');
     fileSystem
       .file('bin/cache/pkg/sky_engine/lib')
       .createSync(recursive: true);
@@ -54,8 +66,20 @@ void main() {
     // Verify that this also works if the sky_engine path is a symlink to the engine root.
     fileSystem.link('/symlink').createSync(kArbitraryEngineRoot);
     fileSystem
-      .file(kDotPackages)
+      .file(kPackageConfig)
-      .writeAsStringSync('sky_engine:file:///symlink/src/out/ios_debug/gen/dart-pkg/sky_engine/lib/');
+        ..createSync(recursive: true)
+        ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "sky_engine",
+      "rootUri": "file:///symlink/src/out/ios_debug/gen/dart-pkg/sky_engine/",
+      "packageUri": "lib/"
+    }
+  ]
+}
+''');
 
     expect(
       await localEngineLocator.findEnginePath(localEngine: 'ios_debug', localHostEngine: 'host_debug'),
@@ -296,7 +320,9 @@ void main() {
   testWithoutContext('works if --local-engine is specified and --local-engine-src-path '
     'is determined by flutter root', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
-    fileSystem.file(kDotPackages).writeAsStringSync('\n');
+    fileSystem
+      .file(kPackageConfig)
+      .createSync(recursive: true);
     fileSystem
       .directory('$kEngineRoot/src/out/ios_debug')
       .createSync(recursive: true);

packages/flutter_tools/test/general.shard/test/test_compiler_test.dart

@@ -42,7 +42,10 @@ void main() {
     fileSystem = MemoryFileSystem.test();
     fileSystem.file('pubspec.yaml').createSync();
     fileSystem.file('test/foo.dart').createSync(recursive: true);
-    fileSystem.file('.packages').createSync();
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
     residentCompiler = FakeResidentCompiler(fileSystem);
     logger = LoggingLogger();
   });
@@ -155,7 +158,22 @@ dependencies:
     sdk: flutter
   a_plugin: 1.0.0
 ''');
-      fileSystem.file('.packages').writeAsStringSync('a_plugin:/a_plugin/lib/');
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+        ..createSync(recursive: true)
+        ..writeAsStringSync('''
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "a_plugin",
+      "rootUri": "/a_plugin/",
+      "packageUri": "lib/"
+    }
+  ]
+}
+''');
       fakeDartPlugin.childFile('pubspec.yaml')
           ..createSync(recursive: true)
           ..writeAsStringSync('''

packages/flutter_tools/test/general.shard/web/compile_web_test.dart

@@ -37,7 +37,11 @@ void main() {
     );
 
     flutterProject = FlutterProject.fromDirectoryTest(fileSystem.currentDirectory);
-    fileSystem.file('.packages').createSync();
+
+    fileSystem
+      .directory('.dart_tool')
+      .childFile('package_config.json')
+      .createSync(recursive: true);
   });
 
   testUsingContext('WebBuilder sets environment on success', () async {

packages/flutter_tools/test/general.shard/web/devfs_web_ddc_modules_test.dart

@@ -909,7 +909,7 @@ void main() {
               port: 0,
               tlsCertPath: null,
               tlsCertKeyPath: null,
-              packagesFilePath: '.packages',
+              packagesFilePath: '.dart_tool/package_config.json',
               urlTunneller: null, // ignore: avoid_redundant_argument_values
               useSseForDebugProxy: true,
               useSseForDebugBackend: true,
@@ -1049,7 +1049,7 @@ void main() {
               port: 0,
               tlsCertPath: null,
               tlsCertKeyPath: null,
-              packagesFilePath: '.packages',
+              packagesFilePath: '.dart_tool/package_config.json',
               urlTunneller: null, // ignore: avoid_redundant_argument_values
               useSseForDebugProxy: true,
               useSseForDebugBackend: true,
@@ -1189,7 +1189,7 @@ void main() {
                 port: 0,
                 tlsCertPath: null,
                 tlsCertKeyPath: null,
-                packagesFilePath: '.packages',
+                packagesFilePath: '.dart_tool/package_config.json',
                 urlTunneller: null,
                 useSseForDebugProxy: true,
                 useSseForDebugBackend: true,
@@ -1268,7 +1268,7 @@ void main() {
               port: 0,
               tlsCertPath: null,
               tlsCertKeyPath: null,
-              packagesFilePath: '.packages',
+              packagesFilePath: '.dart_tool/package_config.json',
               urlTunneller: null, // ignore: avoid_redundant_argument_values
               useSseForDebugProxy: true,
               useSseForDebugBackend: true,
@@ -1315,7 +1315,7 @@ void main() {
               port: 0,
               tlsCertPath: null,
               tlsCertKeyPath: null,
-              packagesFilePath: '.packages',
+              packagesFilePath: '.dart_tool/package_config.json',
               urlTunneller: null, // ignore: avoid_redundant_argument_values
               useSseForDebugProxy: true,
               useSseForDebugBackend: true,
@@ -1371,7 +1371,7 @@ void main() {
               port: 0,
               tlsCertPath: null,
               tlsCertKeyPath: null,
-              packagesFilePath: '.packages',
+              packagesFilePath: '.dart_tool/package_config.json',
               urlTunneller: null, // ignore: avoid_redundant_argument_values
               useSseForDebugProxy: true,
               useSseForDebugBackend: true,
@@ -1433,7 +1433,7 @@ void main() {
               port: 0,
               tlsCertPath: dummyCertPath,
               tlsCertKeyPath: dummyCertKeyPath,
-              packagesFilePath: '.packages',
+              packagesFilePath: '.dart_tool/package_config.json',
               urlTunneller: null, // ignore: avoid_redundant_argument_values
               useSseForDebugProxy: true,
               useSseForDebugBackend: true,
@@ -1613,7 +1613,7 @@ void main() {
               port: 0,
               tlsCertPath: null,
               tlsCertKeyPath: null,
-              packagesFilePath: '.packages',
+              packagesFilePath: '.dart_tool/package_config.json',
               urlTunneller: null, // ignore: avoid_redundant_argument_values
               useSseForDebugProxy: true,
               useSseForDebugBackend: true,

packages/flutter_tools/test/general.shard/web/devfs_web_test.dart

@@ -740,7 +740,7 @@ void main() {
       port: 0,
       tlsCertPath: null,
       tlsCertKeyPath: null,
-      packagesFilePath: '.packages',
+      packagesFilePath: '.dart_tool/package_config.json',
       urlTunneller: null,
       useSseForDebugProxy: true,
       useSseForDebugBackend: true,
@@ -856,7 +856,7 @@ void main() {
       port: 0,
       tlsCertPath: null,
       tlsCertKeyPath: null,
-      packagesFilePath: '.packages',
+      packagesFilePath: '.dart_tool/package_config.json',
       urlTunneller: null,
       useSseForDebugProxy: true,
       useSseForDebugBackend: true,
@@ -977,7 +977,7 @@ void main() {
         port: 0,
         tlsCertPath: null,
         tlsCertKeyPath: null,
-        packagesFilePath: '.packages',
+        packagesFilePath: '.dart_tool/package_config.json',
         urlTunneller: null,
         useSseForDebugProxy: true,
         useSseForDebugBackend: true,
@@ -1048,7 +1048,7 @@ void main() {
       port: 0,
       tlsCertPath: null,
       tlsCertKeyPath: null,
-      packagesFilePath: '.packages',
+      packagesFilePath: '.dart_tool/package_config.json',
       urlTunneller: null,
       useSseForDebugProxy: true,
       useSseForDebugBackend: true,
@@ -1091,7 +1091,7 @@ void main() {
       port: 0,
       tlsCertPath: null,
       tlsCertKeyPath: null,
-      packagesFilePath: '.packages',
+      packagesFilePath: '.dart_tool/package_config.json',
       urlTunneller: null,
       useSseForDebugProxy: true,
       useSseForDebugBackend: true,
@@ -1143,7 +1143,7 @@ void main() {
       port: 0,
       tlsCertPath: null,
       tlsCertKeyPath: null,
-      packagesFilePath: '.packages',
+      packagesFilePath: '.dart_tool/package_config.json',
       urlTunneller: null,
       useSseForDebugProxy: true,
       useSseForDebugBackend: true,
@@ -1203,7 +1203,7 @@ void main() {
       port: 0,
       tlsCertPath: dummyCertPath,
       tlsCertKeyPath: dummyCertKeyPath,
-      packagesFilePath: '.packages',
+      packagesFilePath: '.dart_tool/package_config.json',
       urlTunneller: null,
       useSseForDebugProxy: true,
       useSseForDebugBackend: true,
@@ -1366,7 +1366,7 @@ void main() {
       port: 0,
       tlsCertPath: null,
       tlsCertKeyPath: null,
-      packagesFilePath: '.packages',
+      packagesFilePath: '.dart_tool/package_config.json',
       urlTunneller: null,
       useSseForDebugProxy: true,
       useSseForDebugBackend: true,

packages/flutter_tools/test/general.shard/web/migrations/scrub_generated_plugin_registrant_test.dart

@@ -200,7 +200,7 @@ void writeGeneratedPluginRegistrant(FileSystem fs) {
 // (taken from commands.shard/hermetic/build_web_test.dart)
 void setupFileSystemForEndToEndTest(FileSystem fileSystem) {
   final List<String> dependencies = <String>[
-    '.packages',
+    fileSystem.path.join('.dart_tool', 'package_config.json'),
     fileSystem.path.join('web', 'index.html'),
     fileSystem.path.join('lib', 'main.dart'),
     fileSystem.path.join('packages', 'flutter_tools', 'lib', 'src', 'build_system', 'targets', 'web.dart'),
@@ -214,11 +214,6 @@ void setupFileSystemForEndToEndTest(FileSystem fileSystem) {
   }
 
   // Project files.
-  fileSystem.file('.packages')
-      .writeAsStringSync('''
-foo:lib/
-fizz:bar/lib/
-''');
   fileSystem.file('pubspec.yaml')
       .writeAsStringSync('''
 name: foo

packages/flutter_tools/test/general.shard/windows/windows_device_test.dart

@@ -68,7 +68,6 @@ void main() {
     final FileSystem fileSystem = MemoryFileSystem.test();
     final WindowsDevice windowsDevice = setUpWindowsDevice(fileSystem: fileSystem);
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     fileSystem.directory('windows').createSync();
     fileSystem.file(fileSystem.path.join('windows', 'CMakeLists.txt')).createSync();
     final FlutterProject flutterProject = setUpFlutterProject(fileSystem.currentDirectory);
@@ -80,7 +79,6 @@ void main() {
     final FileSystem fileSystem = MemoryFileSystem.test();
     final WindowsDevice windowsDevice = setUpWindowsDevice(fileSystem: fileSystem);
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     final FlutterProject flutterProject = setUpFlutterProject(fileSystem.currentDirectory);
 
     expect(windowsDevice.isSupportedForProject(flutterProject), false);
@@ -90,7 +88,6 @@ void main() {
     final FileSystem fileSystem = MemoryFileSystem.test();
     final WindowsDevice windowsDevice = setUpWindowsDevice(fileSystem: fileSystem);
     fileSystem.file('pubspec.yaml').createSync();
-    fileSystem.file('.packages').createSync();
     fileSystem.directory('windows').createSync();
     final FlutterProject flutterProject = setUpFlutterProject(fileSystem.currentDirectory);
 

packages/flutter_tools/test/integration.shard/command_output_test.dart

@@ -95,9 +95,6 @@ void main() {
       directory
         .childFile('pubspec.yaml')
         .writeAsStringSync('name: foo');
-      directory
-        .childFile('.packages')
-        .writeAsStringSync('\n');
       directory
         .childDirectory('lib')
         .childFile('main.dart')

packages/flutter_tools/test/integration.shard/test_data/project.dart

@@ -62,7 +62,7 @@ abstract class Project {
     writeFile(fileSystem.path.join(dir.path, 'web', 'index.html'), indexHtml);
     writeFile(fileSystem.path.join(dir.path, 'web', 'flutter.js'), '');
     writeFile(fileSystem.path.join(dir.path, 'web', 'flutter_service_worker.js'), '');
-    writePackages(dir.path);
+    writePackageConfig(dir.path);
     await getPackages(dir.path);
   }
 

packages/flutter_tools/test/integration.shard/test_utils.dart

@@ -48,9 +48,18 @@ void writeBytesFile(String path, List<int> content) {
     ..writeAsBytesSync(content, flush: true);
 }
 
-void writePackages(String folder) {
+void writePackageConfig(String folder) {
-  writeFile(fileSystem.path.join(folder, '.packages'), '''
+  writeFile(fileSystem.path.join(folder, '.dart_tool', 'package_config.json'), '''
-test:${fileSystem.path.join(fileSystem.currentDirectory.path, 'lib')}/
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "test",
+      "rootUri": "fileSystem.currentDirectory.path"
+      "packageUri": "lib/",
+    }
+  ]
+}
 ''');
 }