Flutter 3.38 WASM failing to compile
bug
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## Steps to Reproduce
<!-- You should provide as much info as possible so that we can reproduce the problem. -->
<details>
<summary>HTML</summary>
<!-- Paste the HTML in full that is not working as expected -->
```html
```
</details>
<details>
<summary>`HtmlWidget` configuration</summary>
<!--
Paste how you are configuring `HtmlWidget` in your app code, e.g.:
HtmlWidget(
html,
onTapUrl: (url) => _someSpecialLogic(url),
textStyle: _someCustomStyle,
);
-->
```dart
HtmlWidget(
state.message!,
textStyle: GoogleFonts.roboto(
fontSize: 16,
color: Theme.of(context).colorScheme.tertiary,
),
)
```
</details>
<details>
<summary>Tesing environment</summary>
<!-- Finally, paste the output of running `flutter doctor -v` here. -->
```
[√] Flutter (Channel stable, 3.38.3, on Microsoft Windows [Versi¢n 10.0.26200.7171], locale es-ES) [367ms]
• Flutter version 3.38.3 on channel stable at C:\Users\pauuc\fvm\versions\3.38.3
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 19074d12f7 (8 days ago), 2025-11-20 17:53:13 -0500
• Engine revision 13e658725d
• Dart version 3.10.1
• DevTools version 2.51.1
• Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets,
omit-legacy-version-file, enable-lldb-debugging
[√] Windows Version (11 Pro 64-bit, 25H2, 2009) [1.100ms]
[√] Android toolchain - develop for Android devices (Android SDK version 36.0.0) [2,2s]
• Android SDK at C:\Users\pauuc\AppData\Local\Android\sdk
• Emulator version 36.2.12.0 (build_id 14214601) (CL:N/A)
• Platform android-36.1, build-tools 36.0.0
• Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
This is the JDK bundled with the latest Android Studio installation on this machine.
To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
• Java version OpenJDK Runtime Environment (build 21.0.8+-14196175-b1038.72)
• All Android licenses accepted.
[√] Chrome - develop for the web [82ms]
• Chrome at C:\Users\pauuc\AppData\Local\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop Windows apps (Visual Studio Community 2026 18.0.2) [81ms]
• Visual Studio at C:\Program Files\Microsoft Visual Studio\18\Community
• Visual Studio Community 2026 version 18.0.11222.15
• Windows 10 SDK version 10.0.26100.0
[√] Connected device (3 available) [261ms]
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Versi¢n 10.0.26200.7171]
• Chrome (web) • chrome • web-javascript • Google Chrome 142.0.7444.176
• Edge (web) • edge • web-javascript • Microsoft Edge 142.0.3595.94
[√] Network resources [378ms]
• All expected network resources are available.
• No issues found!
```
</details>
## Expected results
<!-- What did you want to see? -->
Since Flutter 3.38 update, my application is failing to compile to WebAssembly as it throws this error related to flutter_widget_from_html: type 'NullConstant' is not a subtype of type 'IntConstant' in type cast
## Actual results
Failed to compile
<!-- What did you see? Include a screenshot and/or recording would help tremendously. -->
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