diff --git a/pkg/front_end/lib/src/fasta/kernel/utils.dart b/pkg/front_end/lib/src/fasta/kernel/utils.dart
index cb2eede..c5a343b 100644
--- a/pkg/front_end/lib/src/fasta/kernel/utils.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/utils.dart
@@ -2,9 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:io' show BytesBuilder, File, IOSink;
+import 'dart:io' show File, IOSink;
 
-import 'dart:typed_data' show Uint8List;
+import 'dart:typed_data' show BytesBuilder, Uint8List;
 
 import 'package:_fe_analyzer_shared/src/parser/formal_parameter_kind.dart';
 import 'package:_fe_analyzer_shared/src/scanner/scanner.dart' show Token;
diff --git a/pkg/front_end/lib/src/fasta/util/bytes_sink.dart b/pkg/front_end/lib/src/fasta/util/bytes_sink.dart
index 594c553..af3af08 100644
--- a/pkg/front_end/lib/src/fasta/util/bytes_sink.dart
+++ b/pkg/front_end/lib/src/fasta/util/bytes_sink.dart
@@ -2,7 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:io' show BytesBuilder;
+import 'dart:typed_data' show BytesBuilder;
 
 // TODO(ahe): https://github.com/dart-lang/sdk/issues/28316
 class BytesSink implements Sink<List<int>> {
diff --git a/pkg/front_end/test/crashing_test_case_minimizer_impl.dart b/pkg/front_end/test/crashing_test_case_minimizer_impl.dart
index 8b716eb..7bca147 100644
--- a/pkg/front_end/test/crashing_test_case_minimizer_impl.dart
+++ b/pkg/front_end/test/crashing_test_case_minimizer_impl.dart
@@ -6,11 +6,11 @@
 
 import 'dart:convert' show JsonEncoder, jsonDecode, utf8;
 
-import 'dart:io' show BytesBuilder, File, stdin, stdout;
+import 'dart:io' show File, stdin, stdout;
 
 import 'dart:math' show max;
 
-import 'dart:typed_data' show Uint8List;
+import 'dart:typed_data' show BytesBuilder, Uint8List;
 
 import 'package:_fe_analyzer_shared/src/util/relativize.dart'
     show relativizeUri, isWindows;
diff --git a/pkg/frontend_server/lib/frontend_server.dart b/pkg/frontend_server/lib/frontend_server.dart
index 331ec7a..8015039 100644
--- a/pkg/frontend_server/lib/frontend_server.dart
+++ b/pkg/frontend_server/lib/frontend_server.dart
@@ -7,7 +7,8 @@
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io' hide FileSystemEntity;
+import 'dart:io' show Directory, File, IOSink, stdin, stdout;
+import 'dart:typed_data' show BytesBuilder;
 
 import 'package:args/args.dart';
 import 'package:dev_compiler/dev_compiler.dart'
diff --git a/pkg/kernel/test/binary/utils.dart b/pkg/kernel/test/binary/utils.dart
index b5faa20..a480a7d 100644
--- a/pkg/kernel/test/binary/utils.dart
+++ b/pkg/kernel/test/binary/utils.dart
@@ -2,7 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:io' show BytesBuilder;
+import 'dart:typed_data' show BytesBuilder;
 
 import 'package:kernel/binary/ast_to_binary.dart' show BinaryPrinter;
 import 'package:kernel/kernel.dart';
diff --git a/pkg/kernel/test/metadata_test.dart b/pkg/kernel/test/metadata_test.dart
index 9845b01..3f53712 100644
--- a/pkg/kernel/test/metadata_test.dart
+++ b/pkg/kernel/test/metadata_test.dart
@@ -3,7 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:convert';
-import 'dart:io';
+import 'dart:io' show File;
+import 'dart:typed_data' show BytesBuilder;
 
 import 'package:kernel/ast.dart';
 import 'package:kernel/binary/ast_from_binary.dart';
diff --git a/pkg/test_runner/lib/src/testing_servers.dart b/pkg/test_runner/lib/src/testing_servers.dart
index 0a6814b..d2fb748 100644
--- a/pkg/test_runner/lib/src/testing_servers.dart
+++ b/pkg/test_runner/lib/src/testing_servers.dart
@@ -4,7 +4,8 @@
 
 import 'dart:async';
 import 'dart:convert' show HtmlEscape;
-import 'dart:io';
+import 'dart:io' hide BytesBuilder;
+import 'dart:typed_data' show BytesBuilder;
 
 import 'package:package_config/package_config.dart';
 import 'package:test_runner/src/configuration.dart';
diff --git a/tools/VERSION b/tools/VERSION
index 646007b..db41934 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
 MAJOR 2
 MINOR 18
 PATCH 0
-PRERELEASE 186
+PRERELEASE 187
 PRERELEASE_PATCH 0
\ No newline at end of file