Getting error : "Target dart2js failed: Exception: Warning: The 'dart2js' entrypoint script is deprecated, please use 'dart compile js' instead "

user_9209731 0
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Im trying to build flutter web app on release mode using flutter build web(also tried flutter build web --no-sound-null-safety).When i do,im getting the below error.

D:\saves\reset_password>flutter build web

Building without sound null safety
For more information see https://dart.dev/null-safety/unsound-null-safety

Target dart2js failed: Exception: Warning: The 'dart2js' entrypoint script is deprecated, please use 'dart compile js' instead.
.dart_tool/flutter_build/1916f9367c0e6ad6c929bd88cf5227e5/web_plugin_registrant.dart:14:38:
Error: Null safety features are disabled for this library.
void registerPlugins([final Registrar? pluginRegistrar]) {
                                     ^
Error: Compilation failed.


Compiling lib\main.dart for the Web...                             44.9s
Exception: Failed to compile application for the Web.

It works fine when i run it directly in debug mode using flutter run. Note: I recently upgraded to flutter 3.0 and im using Android studio. Below is my flutter doctor( i am aware of the android tools missing.since im building for web,i didnt pay much attention to it)

D:\saves\reset_password>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, 3.1.0-0.0.pre.966, on Microsoft Windows [Version 10.0.19044.1706], locale en-IN)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    X cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    X Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/windows#android-setup for more details.
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.8.5)
[√] Android Studio (version 4.1)
[√] VS Code (version 1.66.2)
[√] Connected device (3 available)
[√] HTTP Host Availability

! Doctor found issues in 1 category.

dart flutter
5 Answers

flutter build web worked on my local but not on my server, after sudo reboot it worked again. the above sugestet answer didnt work for me...

user_133291700

I had a similar problem. It was on server based on Ubuntu.

In my case I had:

Target dart2js failed: Exception: Warning: The 'dart2js' entrypoint script is deprecated, please use 'dart compile js' instead. flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth_web-3.3.19/lib/firebase_auth_web.dart:402:16: Error: The method 'FirebaseAuthWeb.verifyPhoneNumber' has fewer named arguments than those of overridden method 'FirebaseAuthPlatform.verifyPhoneNumber'. ...

I discovered that a firebase_auth_web dependency had a deprecated version and wasn't used in the project. Hence I removed this dependency. After that the problem disappears.

user_68377770

The fix for this issue is now available on the stable channel 3.3.0. It was due to a change in one of the 3.0 builds that put null safe features in the web plugins registrant. Any web project without null safety would have been affected.

user_10627870

For me was launching flutter clean && flutter pub get on the cmd/terminal, the solution.

user_122946900

I fixed this error by myself.Here's what i did:

I found that there are few dependencies in pubspec.yaml file that are not used currently.I navigated to my .dart_tool\flutter_build\cb8031cdd1bfbcb95122aae4ad9a63d5\web_plugin_registrant.dart and found that those dependencies are being referenced inside registerPlugins().

I cleared all those unused dependencies shown in registerPlugins() and did the following steps:

1.flutter pub get 2.flutter clean 3.flutter build web

And VIOLA! The error went away and i got my files in the build\web folder.

user_92097310
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