diff --git a/packages/devtools/lib/src/timeline/event_details.dart b/packages/devtools/lib/src/timeline/event_details.dart
index 7e7e0ee77fa..2bc3acd8a30 100644
--- a/packages/devtools/lib/src/timeline/event_details.dart
+++ b/packages/devtools/lib/src/timeline/event_details.dart
@@ -3,8 +3,6 @@
 // found in the LICENSE file.
 import 'dart:html' as html;
 
-import 'package:js/js.dart';
-
 import '../globals.dart';
 import '../profiler/cpu_profile_flame_chart.dart';
 import '../profiler/cpu_profile_tables.dart';
@@ -28,12 +26,11 @@ class EventDetails extends CoreElement {
     // The size of the event details section will change as the splitter is
     // is moved. Observe resizing so that we can rebuild the flame chart canvas
     // as necessary.
-    // TODO(kenzie): clean this code up when
-    // https://github.com/dart-lang/html/issues/104 is fixed.
-    final observer =
-        html.ResizeObserver(allowInterop((List<dynamic> entries, _) {
+    // TODO(jacobr): Change argument type when
+    // https://github.com/dart-lang/sdk/issues/36798 is fixed.
+    final observer = html.ResizeObserver((List<dynamic> entries, _) {
       cpuProfiler.flameChart.updateForContainerResize();
-    }));
+    });
     observer.observe(element);
 
     assert(tabNav != null);
diff --git a/packages/devtools/lib/src/timeline/timeline_screen.dart b/packages/devtools/lib/src/timeline/timeline_screen.dart
index f468f6ddf28..ea9e9ede94a 100644
--- a/packages/devtools/lib/src/timeline/timeline_screen.dart
+++ b/packages/devtools/lib/src/timeline/timeline_screen.dart
@@ -6,7 +6,6 @@ import 'dart:convert';
 import 'dart:html' as html;
 import 'dart:math' as math;
 
-import 'package:js/js.dart';
 import 'package:meta/meta.dart';
 import 'package:split/split.dart' as split;
 
@@ -274,10 +273,9 @@ class TimelineScreen extends Screen {
     // The size of [flameChartContainer] will change as the splitter moved.
     // Observe resizing so that we can rebuild the flame chart canvas as
     // necessary.
-    // TODO(kenzie): clean this code up when
-    // https://github.com/dart-lang/html/issues/104 is fixed.
-    final observer =
-        html.ResizeObserver(allowInterop((List<dynamic> entries, _) {
+    // TODO(jacobr): Change argument type when
+    // https://github.com/dart-lang/sdk/issues/36798 is fixed.
+    final observer = html.ResizeObserver((List<dynamic> entries, _) {
       // TODO(kenzie): observe resizing for recordedTimeline as well. Recorded
       // timeline will not have a selected frame.
       if (flameChartCanvas == null ||
@@ -300,7 +298,7 @@ class TimelineScreen extends Screen {
               TimelineFlameChartCanvas.sectionSpacing,
         ),
       );
-    }));
+    });
     observer.observe(flameChartContainer.element);
   }
 
diff --git a/packages/devtools/lib/src/ui/viewport_canvas.dart b/packages/devtools/lib/src/ui/viewport_canvas.dart
index 9d8ea0e3431..416beef41bf 100644
--- a/packages/devtools/lib/src/ui/viewport_canvas.dart
+++ b/packages/devtools/lib/src/ui/viewport_canvas.dart
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:html' hide VoidCallback;
-import 'dart:js';
 
 import 'package:meta/meta.dart';
 
@@ -169,11 +168,11 @@ class ViewportCanvas extends Object with SetStateMixin {
       ..overflow = 'hidden';
     _element.add(_content);
 
-    // TODO(jacobr): clean this code up when
-    // https://github.com/dart-lang/html/issues/104 is fixed.
-    _resizeObserver = ResizeObserver(allowInterop((List<dynamic> entries, _) {
+    // TODO(jacobr): Change argument type when
+    // https://github.com/dart-lang/sdk/issues/36798 is fixed.
+    _resizeObserver = ResizeObserver((List<dynamic> entries, _) {
       _scheduleRebuild();
-    }));
+    });
     _resizeObserver.observe(_element.element);
 
     element.onScroll.listen((_) {