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[material_ui][pana] pana 0.23.18 reports Web as unsupported although the application builds successfully with WebAssembly #191887
Description
I'm not sure whether this is a material_ui issue or pana issue, but I firstly report it here.
Steps to reproduce
Run the following commands with the code sample below:
dart pub global activate pana 0.23.18
dart pub global run pana:pana --json --no-warning --no-dartdoc .
Expected results
The output contains:
"tags": [
"is:wasm-ready"
]It also reports:
Supports 6 of 6 possible platforms
WASM compatibility
This package is compatible with runtime `wasm`
Actual results
The output contains no tags:
"tags": []
It reports Web as unsupported with the following import chain:
Package not compatible with platform Web
Because:
* package:material_ui_pana_repro/main.dart that imports:
* package:material_ui/material_ui.dart that imports:
* package:material_ui/src/about.dart that imports:
* dart:io
Please note that pana 0.23.5 correctly outputs is:wasm-ready and it MAY BE a pana issue...
Code sample
pubspec.yaml:
name: material_ui_pana_repro
description: Minimal reproduction for material_ui causing pana to omit is:wasm-ready.
version: 0.1.0
environment:
sdk: ^3.12.0
flutter: '>=3.47.0'
dependencies:
flutter:
sdk: flutter
material_ui: ^1.0.0
dev_dependencies:
flutter_test:
sdk: flutter
flutter_lints: ^6.0.0lib/main.dart:
import 'package:material_ui/material_ui.dart';
void main() {
runApp(const MainApp());
}
class MainApp extends StatelessWidget {
const MainApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: Scaffold(
body: Center(
child: Text('material_ui builds successfully with WebAssembly'),
),
),
);
}
}The application does not use AboutDialog or any API that directly requires dart:io.
Logs
Logs
dart pub global run pana:pana --json --no-warning --no-dartdoc .
{"logName":"pana","level":"INFO","message":"Running `dart --version`..."}
{"logName":"pana","level":"INFO","message":"Running `dart pub get --no-example`..."}
{"logName":"pana","level":"INFO","message":"Running `dart pub get --no-example`..."}
{"logName":"pana","level":"INFO","message":"Running `dart pub outdated --json --up-to-date --no-dev-dependencies --no-dependency-overrides`..."}
{"logName":"pana","level":"INFO","message":"Analyzing package..."}
{"logName":"pana","level":"INFO","message":"Running `dart analyze --format machine --no-plugins .`..."}
{"logName":"pana","level":"INFO","message":"Running `dart pub get --no-example`..."}
{"logName":"pana","level":"INFO","message":"Running `dart format --output=none --set-exit-if-changed /tmp/pana_FCZNFA/.`..."}
{"logName":"pana","level":"INFO","message":"Analyzing pub downgrade..."}
{"logName":"pana","level":"INFO","message":"Running `dart pub downgrade --no-example`..."}
{"logName":"pana","level":"INFO","message":"Running `dart analyze --format machine --no-plugins .`..."}
{"logName":"pana","level":"INFO","message":"[pub-downgrade-success]"}
{"logName":"pana","level":"INFO","message":"Running `dart pub upgrade --no-example`..."}
{
"createdAt": "2026-08-28T00:16:57.923409",
"runtimeInfo": {
"panaVersion": "0.23.18",
"sdkVersion": "3.13.1",
"flutterVersions": {
"frameworkVersion": "3.47.1",
"channel": "stable",
"repositoryUrl": "https://github.com/flutter/flutter",
"frameworkRevision": "6655482ec06e547f90abf8ae7590466f4415978d",
"frameworkCommitDate": "2026-08-19 10:07:23 -0700",
"engineRevision": "5d531788691ec3404cac0cee66ead4007b177363",
"engineCommitDate": "2026-08-18 23:36:01.000Z",
"engineContentHash": "11d79658c444477b06513d32b52c8c4ccb7276b0",
"engineBuildDate": "2026-08-19 12:19:20.672",
"dartSdkVersion": "3.13.1",
"devToolsVersion": "2.60.0",
"flutterVersion": "3.47.1"
}
},
"packageName": "material_ui_pana_repro",
"packageVersion": "0.1.0",
"pubspec": {
"name": "material_ui_pana_repro",
"description": "Minimal reproduction for material_ui causing pana to omit is:wasm-ready.",
"version": "0.1.0",
"environment": {
"sdk": "^3.12.0",
"flutter": ">=3.47.0"
},
"dependencies": {
"flutter": {
"sdk": "flutter"
},
"material_ui": "^1.0.0"
},
"dev_dependencies": {
"flutter_test": {
"sdk": "flutter"
},
"flutter_lints": "^6.0.0"
}
},
"allDependencies": [
"characters",
"clock",
"collection",
"cupertino_ui",
"flutter",
"flutter_lints",
"flutter_test",
"intl",
"material_color_utilities",
"material_ui",
"meta",
"path",
"vector_math"
],
"tags": [
"sdk:flutter",
"platform:android",
"platform:ios",
"platform:windows",
"platform:linux",
"platform:macos",
"is:null-safe",
"is:dart3-compatible",
"license:unknown"
],
"report": {
"sections": [
{
"id": "convention",
"title": "Follow Dart file conventions",
"grantedPoints": 5,
"maxPoints": 30,
"status": "failed",
"summary": "### [x] 0/10 points: Provide a valid `pubspec.yaml`\n\n* `pubspec.yaml` doesn't have a `homepage` entry.\n\n* `pubspec.yaml` doesn't have a `repository` entry.\n\n### [*] 5/5 points: Provide a valid `README.md`\n\n### [x] 0/5 points: Provide a valid `CHANGELOG.md`\n\n<details>\n<summary>\nNo `CHANGELOG.md` found.\n</summary>\n\nChangelog entries help developers follow the progress of your package. Check out the Dart conventions for [Maintaining a package changelog](https://dart.dev/tools/pub/package-layout#changelog).\n</details>\n\n### [x] 0/10 points: Use an OSI-approved license\n\n<details>\n<summary>\nNo license was recognized.\n</summary>\n\nConsider using an [OSI-approved license](https://opensource.org/licenses) in the `LICENSE` file to make it more accessible to the community.\n</details>\n"
},
{
"id": "documentation",
"title": "Provide documentation",
"grantedPoints": 0,
"maxPoints": 10,
"status": "failed",
"summary": "### [x] 0/10 points: Package has an example\n\n<details>\n<summary>\nNo example found.\n</summary>\n\nSee [package layout](https://dart.dev/tools/pub/package-layout#examples) guidelines on how to add an example.\n</details>\n"
},
{
"id": "platform",
"title": "Platform support",
"grantedPoints": 20,
"maxPoints": 20,
"status": "passed",
"summary": "### [*] 20/20 points: Supports 5 of 6 possible platforms (**iOS**, **Android**, Web, **Windows**, **macOS**, **Linux**)\n\n* ✓ Android\n\n* ✓ iOS\n\n* ✓ Windows\n\n* ✓ Linux\n\n* ✓ macOS\n\n\nThese platforms are not supported:\n\n<details>\n<summary>\nPackage not compatible with platform Web\n</summary>\n\nBecause:\n* `package:material_ui_pana_repro/main.dart` that imports:\n* `package:material_ui/material_ui.dart` that imports:\n* `package:material_ui/src/about.dart` that imports:\n* `dart:io`\n</details>\n"
},
{
"id": "analysis",
"title": "Pass static analysis",
"grantedPoints": 50,
"maxPoints": 50,
"status": "passed",
"summary": "### [*] 50/50 points: code has no errors, warnings, lints, or formatting issues\n"
},
{
"id": "dependency",
"title": "Support up-to-date dependencies",
"grantedPoints": 40,
"maxPoints": 40,
"status": "passed",
"summary": "### [*] 10/10 points: All of the package dependencies are supported in the latest version\n\n|Package|Constraint|Compatible|Latest|Notes|\n|:-|:-|:-|:-|:-|\n|[`material_ui`]|`^1.0.0`|1.1.0|1.1.0||\n\n<details><summary>Transitive dependencies</summary>\n\n|Package|Constraint|Compatible|Latest|Notes|\n|:-|:-|:-|:-|:-|\n|[`characters`]|-|1.4.1|1.4.1||\n|[`clock`]|-|1.1.2|1.1.2||\n|[`collection`]|-|1.19.1|1.19.1||\n|[`cupertino_ui`]|-|1.0.1|1.0.1||\n|[`intl`]|-|0.20.3|0.20.3||\n|[`material_color_utilities`]|-|0.13.0|0.13.1||\n|[`meta`]|-|1.19.0|1.19.0||\n|[`path`]|-|1.9.1|1.9.1||\n|[`vector_math`]|-|2.4.2|2.4.2||\n</details>\n\nTo reproduce run `dart pub outdated --no-dev-dependencies --up-to-date --no-dependency-overrides`.\n\n[`material_ui`]: https://pub.dev/packages/material_ui\n[`characters`]: https://pub.dev/packages/characters\n[`clock`]: https://pub.dev/packages/clock\n[`collection`]: https://pub.dev/packages/collection\n[`cupertino_ui`]: https://pub.dev/packages/cupertino_ui\n[`intl`]: https://pub.dev/packages/intl\n[`material_color_utilities`]: https://pub.dev/packages/material_color_utilities\n[`meta`]: https://pub.dev/packages/meta\n[`path`]: https://pub.dev/packages/path\n[`vector_math`]: https://pub.dev/packages/vector_math\n\n### [*] 10/10 points: Package supports latest stable Dart and Flutter SDKs\n\n### [*] 20/20 points: Compatible with dependency constraint lower bounds\n\n`pub downgrade` does not expose any static analysis error.\n"
}
]
},
"screenshots": [],
"result": {
"repositoryStatus": "unspecified",
"licenses": [],
"grantedPoints": 115,
"maxPoints": 150
},
"urlProblems": [],
"scores": {
"grantedPoints": 115,
"maxPoints": 150
}
}Flutter Doctor output
Doctor output
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.47.1, on Ubuntu 26.04 LTS 6.18.35.2-microsoft-standard-WSL2, locale C.UTF-8)
[!] Android toolchain - develop for Android devices (Android SDK version 36.0.0)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✓] Linux toolchain - develop for Linux desktopReacted by Roman Cinis
Activity
mbcorona commentedon Aug 27, 2026
Hi @espresso3389, thanks for the report. This looks like it's on the material_ui side and not pana.
material_ui/lib/src/about.dart imports
dart:iounconditionally (import 'dart:io' show Platform;). Since about.dart is reachable from the material_ui barrel, pana's static platform analysis correctly marks the package as not web-compatible, which is why is:wasm-ready disappears. pana 0.23.5 missed this; 0.23.18 is the more correct behavior rather than a regression.Routing to the design team for further investigation.
[material_ui] Remove unconditional dart:io import from about.dart
ci: relax pana threshold for flutter packages
refactor(ui): improve flag badge artwork and deprecate shield dividers (
[material_ui] Remove unconditional dart:io import from about.dart
[material_ui] Remove unconditional dart:io import from about.dart (fl…
github-actions commentedon Oct 16, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.