diff --git a/engine/src/flutter/lib/web_ui/analysis_options.yaml b/engine/src/flutter/lib/web_ui/analysis_options.yaml
index 3a172dcb3c..b42eeac6e0 100644
--- a/engine/src/flutter/lib/web_ui/analysis_options.yaml
+++ b/engine/src/flutter/lib/web_ui/analysis_options.yaml
@@ -10,7 +10,7 @@ linter:
   rules:
     avoid_print: false
     avoid_setters_without_getters: false
-    invalid_runtime_check_with_js_interop_types: false
+    #invalid_runtime_check_with_js_interop_types: false
     library_private_types_in_public_api: false
     no_default_cases: false
     prefer_relative_imports: false
diff --git a/engine/src/flutter/lib/web_ui/lib/src/engine/dom.dart b/engine/src/flutter/lib/web_ui/lib/src/engine/dom.dart
index 122e24dc63..f9e3fbf932 100644
--- a/engine/src/flutter/lib/web_ui/lib/src/engine/dom.dart
+++ b/engine/src/flutter/lib/web_ui/lib/src/engine/dom.dart
@@ -1206,7 +1206,7 @@ abstract class HttpFetchPayload {
   ///
   /// Combined with [HttpFetchResponse.contentLength], this can be used to
   /// implement various "progress bar" functionality.
-  Future<void> read<T>(HttpFetchReader<T> reader);
+  Future<void> read<T extends JSAny>(HttpFetchReader<T> reader);
 
   /// Returns the data as a [ByteBuffer].
   Future<ByteBuffer> asByteBuffer();
@@ -1224,7 +1224,7 @@ class HttpFetchPayloadImpl implements HttpFetchPayload {
   final DomResponse _domResponse;
 
   @override
-  Future<void> read<T>(HttpFetchReader<T> callback) async {
+  Future<void> read<T extends JSAny>(HttpFetchReader<T> callback) async {
     final _DomReadableStream stream = _domResponse.body;
     final _DomStreamReader reader = stream.getReader();
 
@@ -1233,7 +1233,7 @@ class HttpFetchPayloadImpl implements HttpFetchPayload {
       if (chunk.done) {
         break;
       }
-      callback(chunk.value as T);
+      callback(chunk.value! as T);
     }
   }
 
@@ -1261,7 +1261,7 @@ class MockHttpFetchPayload implements HttpFetchPayload {
   final int _chunkSize;
 
   @override
-  Future<void> read<T>(HttpFetchReader<T> callback) async {
+  Future<void> read<T extends JSAny>(HttpFetchReader<T> callback) async {
     final int totalLength = _byteBuffer.lengthInBytes;
     int currentIndex = 0;
     while (currentIndex < totalLength) {
@@ -2267,7 +2267,7 @@ extension type _DomList._(JSObject _) implements JSObject {
   external DomNode item(int index);
 }
 
-class _DomListIterator<T> implements Iterator<T> {
+class _DomListIterator<T extends JSObject> implements Iterator<T> {
   _DomListIterator(this.list);
 
   final _DomList list;
@@ -2286,7 +2286,7 @@ class _DomListIterator<T> implements Iterator<T> {
   T get current => list.item(index) as T;
 }
 
-class _DomListWrapper<T> extends Iterable<T> {
+class _DomListWrapper<T extends JSObject> extends Iterable<T> {
   _DomListWrapper._(this.list);
 
   final _DomList list;
@@ -2301,15 +2301,16 @@ class _DomListWrapper<T> extends Iterable<T> {
 
 /// This is a work around for a `TypeError` which can be triggered by calling
 /// `toList` on the `Iterable`.
-Iterable<T> createDomListWrapper<T>(_DomList list) => _DomListWrapper<T>._(list).cast<T>();
+Iterable<T> createDomListWrapper<T extends JSObject>(_DomList list) =>
+    _DomListWrapper<T>._(list).cast<T>();
 
 // https://developer.mozilla.org/en-US/docs/Web/API/TouchList
 extension type _DomTouchList._(JSObject _) implements JSObject {
   external double get length;
-  external DomNode item(int index);
+  external DomTouch item(int index);
 }
 
-class _DomTouchListIterator<T> implements Iterator<T> {
+class _DomTouchListIterator<T extends DomTouch> implements Iterator<T> {
   _DomTouchListIterator(this.list);
 
   final _DomTouchList list;
@@ -2328,7 +2329,7 @@ class _DomTouchListIterator<T> implements Iterator<T> {
   T get current => list.item(index) as T;
 }
 
-class _DomTouchListWrapper<T> extends Iterable<T> {
+class _DomTouchListWrapper<T extends DomTouch> extends Iterable<T> {
   _DomTouchListWrapper._(this.list);
 
   final _DomTouchList list;
@@ -2341,7 +2342,7 @@ class _DomTouchListWrapper<T> extends Iterable<T> {
   int get length => list.length.toInt();
 }
 
-Iterable<T> createDomTouchListWrapper<T>(_DomTouchList list) =>
+Iterable<T> createDomTouchListWrapper<T extends DomTouch>(_DomTouchList list) =>
     _DomTouchListWrapper<T>._(list).cast<T>();
 
 @JS('Symbol')
@@ -2394,7 +2395,7 @@ extension type DomIteratorResult._(JSObject _) implements JSObject {
 }
 
 /// Wraps a native JS iterator to provide a Dart [Iterator].
-class DomIteratorWrapper<T> implements Iterator<T> {
+class DomIteratorWrapper<T extends JSAny> implements Iterator<T> {
   DomIteratorWrapper(this._iterator);
 
   final DomIterator _iterator;
diff --git a/engine/src/flutter/lib/web_ui/lib/src/engine/platform_dispatcher/view_focus_binding.dart b/engine/src/flutter/lib/web_ui/lib/src/engine/platform_dispatcher/view_focus_binding.dart
index fb74b6da9e..a7d73c1929 100644
--- a/engine/src/flutter/lib/web_ui/lib/src/engine/platform_dispatcher/view_focus_binding.dart
+++ b/engine/src/flutter/lib/web_ui/lib/src/engine/platform_dispatcher/view_focus_binding.dart
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:js_interop';
 
 import 'package:meta/meta.dart';
 import 'package:ui/src/engine.dart';
@@ -86,7 +87,7 @@ final class ViewFocusBinding {
     // The right event type needs to be checked because Chrome seems to be firing
     // `Event` events instead of `KeyboardEvent` events when autofilling is used.
     // See https://github.com/flutter/flutter/issues/149968 for more info.
-    if (event is DomKeyboardEvent && (event.shiftKey ?? false)) {
+    if (event.isA<DomKeyboardEvent>() && ((event as DomKeyboardEvent).shiftKey ?? false)) {
       _viewFocusDirection = ui.ViewFocusDirection.backward;
     }
   });
diff --git a/engine/src/flutter/lib/web_ui/lib/src/engine/pointer_binding.dart b/engine/src/flutter/lib/web_ui/lib/src/engine/pointer_binding.dart
index 2552a3af5d..2c60bde1eb 100644
--- a/engine/src/flutter/lib/web_ui/lib/src/engine/pointer_binding.dart
+++ b/engine/src/flutter/lib/web_ui/lib/src/engine/pointer_binding.dart
@@ -322,7 +322,9 @@ class ClickDebouncer {
     assert(event.type == 'pointerdown', 'Click debouncing must begin with a pointerdown');
 
     final DomEventTarget? target = event.target;
-    if (target is DomElement && target.hasAttribute('flt-tappable')) {
+    if (target != null &&
+        (target.isA<DomElement>()) &&
+        (target as DomElement).hasAttribute('flt-tappable')) {
       _state = (
         target: target,
         // The 200ms duration was chosen empirically by testing tapping, mouse