diff --git a/pkg/analyzer/lib/error/error.dart b/pkg/analyzer/lib/error/error.dart
index d6fa2dd..3ff56b9 100644
--- a/pkg/analyzer/lib/error/error.dart
+++ b/pkg/analyzer/lib/error/error.dart
@@ -6,7 +6,6 @@
 
 import 'package:_fe_analyzer_shared/src/base/errors.dart';
 import 'package:_fe_analyzer_shared/src/messages/codes.dart';
-import 'package:_fe_analyzer_shared/src/scanner/errors.dart';
 import 'package:analyzer/diagnostic/diagnostic.dart';
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/error/ffi_code.dart';
diff --git a/pkg/analyzer/lib/src/dart/constant/value.dart b/pkg/analyzer/lib/src/dart/constant/value.dart
index 359885a..9f5cd42 100644
--- a/pkg/analyzer/lib/src/dart/constant/value.dart
+++ b/pkg/analyzer/lib/src/dart/constant/value.dart
@@ -13,7 +13,6 @@
 import 'package:analyzer/src/dart/constant/has_type_parameter_reference.dart';
 import 'package:analyzer/src/dart/element/type_system.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:meta/meta.dart';
 
diff --git a/pkg/analyzer/lib/src/error/ignore_validator.dart b/pkg/analyzer/lib/src/error/ignore_validator.dart
index 0c0d4ec..d245ee9e 100644
--- a/pkg/analyzer/lib/src/error/ignore_validator.dart
+++ b/pkg/analyzer/lib/src/error/ignore_validator.dart
@@ -6,7 +6,6 @@
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/source/line_info.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/ignore_comments/ignore_info.dart';
 
 /// Used to validate the ignore comments in a single file.
diff --git a/pkg/analyzer/lib/src/lint/analysis.dart b/pkg/analyzer/lib/src/lint/analysis.dart
index c77fc12..d275458 100644
--- a/pkg/analyzer/lib/src/lint/analysis.dart
+++ b/pkg/analyzer/lib/src/lint/analysis.dart
@@ -22,7 +22,6 @@
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/lint/io.dart';
 import 'package:analyzer/src/lint/linter.dart';
 import 'package:analyzer/src/lint/project.dart';
diff --git a/pkg/analyzer/lib/src/lint/linter.dart b/pkg/analyzer/lib/src/lint/linter.dart
index 9f97db2..0c8f774 100644
--- a/pkg/analyzer/lib/src/lint/linter.dart
+++ b/pkg/analyzer/lib/src/lint/linter.dart
@@ -35,7 +35,6 @@
         AnalysisOptionsImpl;
 import 'package:analyzer/src/generated/resolver.dart' show ScopeResolverVisitor;
 import 'package:analyzer/src/generated/source.dart' show LineInfo;
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/lint/analysis.dart';
 import 'package:analyzer/src/lint/config.dart';
 import 'package:analyzer/src/lint/io.dart';
diff --git a/pkg/analyzer/lib/src/summary/package_bundle_reader.dart b/pkg/analyzer/lib/src/summary/package_bundle_reader.dart
index adff68e..557f22c 100644
--- a/pkg/analyzer/lib/src/summary/package_bundle_reader.dart
+++ b/pkg/analyzer/lib/src/summary/package_bundle_reader.dart
@@ -9,7 +9,6 @@
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/summary2/package_bundle_format.dart';
 
 /// A [ConflictingSummaryException] indicates that two different summaries
diff --git a/pkg/analyzer/lib/src/summary2/link.dart b/pkg/analyzer/lib/src/summary2/link.dart
index b5aa73e..18118c5 100644
--- a/pkg/analyzer/lib/src/summary2/link.dart
+++ b/pkg/analyzer/lib/src/summary2/link.dart
@@ -10,7 +10,6 @@
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/inheritance_manager3.dart';
-import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary2/bundle_writer.dart';
 import 'package:analyzer/src/summary2/detach_nodes.dart';
diff --git a/pkg/analyzer/lib/src/workspace/bazel.dart b/pkg/analyzer/lib/src/workspace/bazel.dart
index cd57df0..7f688ff 100644
--- a/pkg/analyzer/lib/src/workspace/bazel.dart
+++ b/pkg/analyzer/lib/src/workspace/bazel.dart
@@ -8,7 +8,6 @@
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
 import 'package:analyzer/src/util/uri.dart';
 import 'package:analyzer/src/workspace/bazel_watcher.dart';
diff --git a/pkg/analyzer/lib/src/workspace/gn.dart b/pkg/analyzer/lib/src/workspace/gn.dart
index bb958e2..e22ce32 100644
--- a/pkg/analyzer/lib/src/workspace/gn.dart
+++ b/pkg/analyzer/lib/src/workspace/gn.dart
@@ -6,7 +6,6 @@
 import 'package:analyzer/src/context/packages.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/source/package_map_resolver.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
 import 'package:analyzer/src/workspace/workspace.dart';
diff --git a/pkg/analyzer/lib/src/workspace/package_build.dart b/pkg/analyzer/lib/src/workspace/package_build.dart
index 7adef41..ba6e15c 100644
--- a/pkg/analyzer/lib/src/workspace/package_build.dart
+++ b/pkg/analyzer/lib/src/workspace/package_build.dart
@@ -6,7 +6,6 @@
 import 'package:analyzer/src/context/packages.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/lint/pub.dart';
 import 'package:analyzer/src/source/package_map_resolver.dart';
 import 'package:analyzer/src/summary/api_signature.dart';
diff --git a/pkg/analyzer/test/generated/complex_parser_test.dart b/pkg/analyzer/test/generated/complex_parser_test.dart
index 59752a5..31ebd1f 100644
--- a/pkg/analyzer/test/generated/complex_parser_test.dart
+++ b/pkg/analyzer/test/generated/complex_parser_test.dart
@@ -5,7 +5,6 @@
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
-import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
diff --git a/pkg/analyzer/test/generated/extension_methods_parser_test.dart b/pkg/analyzer/test/generated/extension_methods_parser_test.dart
index aca31bc..a7409c6 100644
--- a/pkg/analyzer/test/generated/extension_methods_parser_test.dart
+++ b/pkg/analyzer/test/generated/extension_methods_parser_test.dart
@@ -5,7 +5,6 @@
 import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
-import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
 import 'package:pub_semver/src/version.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
diff --git a/pkg/analyzer/test/generated/formal_parameter_parser_test.dart b/pkg/analyzer/test/generated/formal_parameter_parser_test.dart
index 41de193..cc1b2f1 100644
--- a/pkg/analyzer/test/generated/formal_parameter_parser_test.dart
+++ b/pkg/analyzer/test/generated/formal_parameter_parser_test.dart
@@ -4,7 +4,6 @@
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
-import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
diff --git a/pkg/analyzer/test/generated/source_factory_test.dart b/pkg/analyzer/test/generated/source_factory_test.dart
index 196e8b2..98e3f04 100644
--- a/pkg/analyzer/test/generated/source_factory_test.dart
+++ b/pkg/analyzer/test/generated/source_factory_test.dart
@@ -5,7 +5,6 @@
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/source/package_map_resolver.dart';
 import 'package:analyzer/src/source/source_resource.dart';
 import 'package:analyzer/src/test_utilities/resource_provider_mixin.dart';
diff --git a/pkg/analyzer/test/src/dart/analysis/feature_set_provider_test.dart b/pkg/analyzer/test/src/dart/analysis/feature_set_provider_test.dart
index 0a48c66..86df8d9 100644
--- a/pkg/analyzer/test/src/dart/analysis/feature_set_provider_test.dart
+++ b/pkg/analyzer/test/src/dart/analysis/feature_set_provider_test.dart
@@ -10,7 +10,6 @@
 import 'package:analyzer/src/dart/analysis/experiments_impl.dart';
 import 'package:analyzer/src/dart/analysis/feature_set_provider.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/source/package_map_resolver.dart';
 import 'package:analyzer/src/test_utilities/mock_sdk.dart';
 import 'package:analyzer/src/test_utilities/resource_provider_mixin.dart';
diff --git a/pkg/analyzer/test/src/dart/constant/utilities_test.dart b/pkg/analyzer/test/src/dart/constant/utilities_test.dart
index 92b5d6e..906c7e0 100644
--- a/pkg/analyzer/test/src/dart/constant/utilities_test.dart
+++ b/pkg/analyzer/test/src/dart/constant/utilities_test.dart
@@ -12,7 +12,6 @@
 import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/generated/testing/ast_test_factory.dart';
 import 'package:analyzer/src/generated/testing/element_factory.dart';
 import 'package:analyzer/src/generated/testing/test_type_provider.dart';
diff --git a/tools/VERSION b/tools/VERSION
index 7f10f6b..f5db836 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
 MAJOR 2
 MINOR 15
 PATCH 0
-PRERELEASE 128
+PRERELEASE 129
 PRERELEASE_PATCH 0
\ No newline at end of file