CODEWITHSUNDEEP
flutterdart
vasanth kumar
vasanth kumar

Reputation: 272

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

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.

Upvotes: 18

Views: 18155

Answers (10)

Daniel Peng
Daniel Peng

Reputation: 1

Should you encounter a similar issue to mine, it's worth checking whether your terminal in Android Studio is configured with the correct path. In my case, the terminal was directed to one of my previous projects. Simply restarting the terminal or navigating to the correct directory ('cd' command) resolved the problem

Upvotes: 0

nashihu
nashihu

Reputation: 849

in case you're using old version of flutter, it's probably because old dependency

you can run this to upgrade dependencies that still works in your flutter version

flutter pub upgrade --major-versions

Upvotes: 1

Ricardo Alexis Huerta Salazar
Ricardo Alexis Huerta Salazar

Reputation: 115

You can try to update the dependency that is giving the error

Upvotes: 0

bhavik13
bhavik13

Reputation: 117

Delete .dart_tool

flutter clean
flutter pub get
flutter build web

Upvotes: 0

Jeiel Junio
Jeiel Junio

Reputation: 149

Delete /flutter/bin/cache folder.

Run flutter doctor.

Then, run flutter clean, flutter pub get and flutter build web.

Upvotes: 2

Nimr Sawafta
Nimr Sawafta

Reputation: 648

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

Upvotes: 13

Matthew Patience
Matthew Patience

Reputation: 385

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.

Upvotes: 0

Maksim Ryabovol
Maksim Ryabovol

Reputation: 361

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.

Upvotes: 1

Lorenz
Lorenz

Reputation: 55

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...

Upvotes: 0

vasanth kumar
vasanth kumar

Reputation: 272

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.

Upvotes: -3

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