diff --git a/dev/automated_tests/flutter_test/print_correct_local_widget_test.dart b/dev/automated_tests/flutter_test/print_correct_local_widget_test.dart
index c57726de0e..a1f5309d93 100644
--- a/dev/automated_tests/flutter_test/print_correct_local_widget_test.dart
+++ b/dev/automated_tests/flutter_test/print_correct_local_widget_test.dart
@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/widgets.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
diff --git a/dev/benchmarks/macrobenchmarks/lib/src/color_filter_and_fade.dart b/dev/benchmarks/macrobenchmarks/lib/src/color_filter_and_fade.dart
index e7bc88d9ec..af00501348 100644
--- a/dev/benchmarks/macrobenchmarks/lib/src/color_filter_and_fade.dart
+++ b/dev/benchmarks/macrobenchmarks/lib/src/color_filter_and_fade.dart
@@ -3,12 +3,8 @@
 // found in the LICENSE file.
 
 import 'dart:ui' as ui;
-import 'dart:ui';
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-import 'package:flutter/rendering.dart';
 
 // This tests whether the Opacity layer raster cache works with color filters.
 // See https://github.com/flutter/flutter/issues/51975.
diff --git a/dev/benchmarks/macrobenchmarks/lib/src/cubic_bezier.dart b/dev/benchmarks/macrobenchmarks/lib/src/cubic_bezier.dart
index 6ce3c17242..92e465bc58 100644
--- a/dev/benchmarks/macrobenchmarks/lib/src/cubic_bezier.dart
+++ b/dev/benchmarks/macrobenchmarks/lib/src/cubic_bezier.dart
@@ -4,8 +4,6 @@
 
 import 'dart:math';
 
-import 'package:flutter/widgets.dart';
-import 'package:flutter/animation.dart';
 import 'package:flutter/material.dart';
 
 // Based on https://github.com/eseidelGoogle/bezier_perf/blob/master/lib/main.dart
diff --git a/dev/benchmarks/macrobenchmarks/lib/src/picture_cache.dart b/dev/benchmarks/macrobenchmarks/lib/src/picture_cache.dart
index a0c2a213f6..63d03f4c7e 100644
--- a/dev/benchmarks/macrobenchmarks/lib/src/picture_cache.dart
+++ b/dev/benchmarks/macrobenchmarks/lib/src/picture_cache.dart
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
-import 'package:flutter/rendering.dart';
 
 class PictureCachePage extends StatelessWidget {
   static const List<String> kTabNames = <String>['1', '2', '3', '4', '5'];
diff --git a/dev/benchmarks/macrobenchmarks/lib/src/web/bench_text_layout.dart b/dev/benchmarks/macrobenchmarks/lib/src/web/bench_text_layout.dart
index f0de058555..0720eaabb0 100644
--- a/dev/benchmarks/macrobenchmarks/lib/src/web/bench_text_layout.dart
+++ b/dev/benchmarks/macrobenchmarks/lib/src/web/bench_text_layout.dart
@@ -8,7 +8,6 @@ import 'dart:math';
 import 'dart:ui' as ui;
 
 import 'package:flutter/material.dart';
-import 'package:meta/meta.dart';
 
 import 'recorder.dart';
 
diff --git a/dev/benchmarks/macrobenchmarks/lib/src/web/bench_wrapbox_scroll.dart b/dev/benchmarks/macrobenchmarks/lib/src/web/bench_wrapbox_scroll.dart
index 297c281971..2ed8a04dad 100644
--- a/dev/benchmarks/macrobenchmarks/lib/src/web/bench_wrapbox_scroll.dart
+++ b/dev/benchmarks/macrobenchmarks/lib/src/web/bench_wrapbox_scroll.dart
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:ui';
 
 import 'package:flutter/material.dart';
 
diff --git a/dev/benchmarks/macrobenchmarks/test/picture_cache_perf_e2e.dart b/dev/benchmarks/macrobenchmarks/test/picture_cache_perf_e2e.dart
index e39385c112..c0addf1c86 100644
--- a/dev/benchmarks/macrobenchmarks/test/picture_cache_perf_e2e.dart
+++ b/dev/benchmarks/macrobenchmarks/test/picture_cache_perf_e2e.dart
@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/gestures.dart';
 import 'package:flutter/widgets.dart';
-import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:macrobenchmarks/common.dart';
 
diff --git a/dev/benchmarks/microbenchmarks/lib/geometry/matrix_utils_transform_bench.dart b/dev/benchmarks/microbenchmarks/lib/geometry/matrix_utils_transform_bench.dart
index 75b8a34242..f3fb9fc642 100644
--- a/dev/benchmarks/microbenchmarks/lib/geometry/matrix_utils_transform_bench.dart
+++ b/dev/benchmarks/microbenchmarks/lib/geometry/matrix_utils_transform_bench.dart
@@ -4,9 +4,7 @@
 
 import 'dart:math' as math;
 
-import 'package:flutter/painting.dart';
 import 'package:flutter/rendering.dart';
-import 'package:vector_math/vector_math_64.dart';
 
 import '../common.dart';
 
diff --git a/dev/benchmarks/microbenchmarks/lib/gestures/gesture_detector_bench.dart b/dev/benchmarks/microbenchmarks/lib/gestures/gesture_detector_bench.dart
index 98a2db90e4..34025c6731 100644
--- a/dev/benchmarks/microbenchmarks/lib/gestures/gesture_detector_bench.dart
+++ b/dev/benchmarks/microbenchmarks/lib/gestures/gesture_detector_bench.dart
@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/gestures.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 import '../common.dart';
diff --git a/dev/benchmarks/microbenchmarks/lib/stocks/animation_bench.dart b/dev/benchmarks/microbenchmarks/lib/stocks/animation_bench.dart
index 4138c15e10..2df188fa70 100644
--- a/dev/benchmarks/microbenchmarks/lib/stocks/animation_bench.dart
+++ b/dev/benchmarks/microbenchmarks/lib/stocks/animation_bench.dart
@@ -2,11 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:async';
-
 import 'package:flutter_test/flutter_test.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:stocks/main.dart' as stocks;
 import 'package:stocks/stock_data.dart' as stock_data;
diff --git a/dev/benchmarks/microbenchmarks/lib/stocks/build_bench.dart b/dev/benchmarks/microbenchmarks/lib/stocks/build_bench.dart
index d1b841dedd..67a5a8d17b 100644
--- a/dev/benchmarks/microbenchmarks/lib/stocks/build_bench.dart
+++ b/dev/benchmarks/microbenchmarks/lib/stocks/build_bench.dart
@@ -2,10 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:async';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/rendering.dart';
 import 'package:stocks/main.dart' as stocks;
 import 'package:stocks/stock_data.dart' as stock_data;
 
diff --git a/dev/benchmarks/microbenchmarks/lib/stocks/layout_bench.dart b/dev/benchmarks/microbenchmarks/lib/stocks/layout_bench.dart
index fa5c44a93d..df41494dbb 100644
--- a/dev/benchmarks/microbenchmarks/lib/stocks/layout_bench.dart
+++ b/dev/benchmarks/microbenchmarks/lib/stocks/layout_bench.dart
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:async';
-
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
diff --git a/dev/benchmarks/test_apps/stocks/test/icon_color_test.dart b/dev/benchmarks/test_apps/stocks/test/icon_color_test.dart
index 9e965f2f03..89234d338a 100644
--- a/dev/benchmarks/test_apps/stocks/test/icon_color_test.dart
+++ b/dev/benchmarks/test_apps/stocks/test/icon_color_test.dart
@@ -5,7 +5,6 @@
 import 'dart:ui' as ui show window;
 
 import 'package:flutter/material.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:stocks/main.dart' as stocks;
 import 'package:stocks/stock_data.dart' as stock_data;