Flutter Web的颤振构建-“；未能编译应用程序“；

我已经为我的项目启用了web支持，在运行

flatter run-d chrome

之后，我得到以下错误：

Launching lib/main.dart on Chrome in debug mode...
Syncing files to device Chrome...                                                                                                                                                                    
Compiler message:                                  
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapiauth2.dart:26:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  GoogleAuth.fakeConstructor$();                                                                                   
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapiauth2.dart:216:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  SigninOptionsBuilder.fakeConstructor$();                                                                         
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapi.dart:351:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  HttpRequestPromise.fakeConstructor$();                                                                           
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapi.dart:378:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  HttpRequest.fakeConstructor$() : super.fakeConstructor$();                                                       
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapi.dart:402:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  HttpBatch.fakeConstructor$();                                                                                    
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapi.dart:440:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  RpcRequest.fakeConstructor$();                                                                                   
  ^                                                                                                                
Syncing files to device Chrome...                               19,442ms (!)                                       
Failed to compile application.
Tals-Macbook:matkonit talbarda$ flutter run -d chrome
Launching lib/main.dart on Chrome in debug mode...
Syncing files to device Chrome...                                                                                                                                                                    
Compiler message:                                  
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapiauth2.dart:26:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  GoogleAuth.fakeConstructor$();                                                                                   
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapiauth2.dart:216:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  SigninOptionsBuilder.fakeConstructor$();                                                                         
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapi.dart:351:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  HttpRequestPromise.fakeConstructor$();                                                                           
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapi.dart:378:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  HttpRequest.fakeConstructor$() : super.fakeConstructor$();                                                       
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapi.dart:402:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  HttpBatch.fakeConstructor$();                                                                                    
  ^                                                                                                                
../../flutter/.pub-cache/hosted/pub.dartlang.org/google_sign_in_web-0.8.3+1/lib/src/generated/gapi.dart:440:3: Error: JS interop classes do not support non-external constructors.
Try annotating with `external`.                                                                                    
  RpcRequest.fakeConstructor$();                                                                                   
  ^                                                                                                                
Syncing files to device Chrome...                               17,899ms (!)                                       
Failed to compile application.

---

如何修复此问题？

改为转到beta频道

---

颤振通道测试版

我注意到这个问题在google\u web 0.9.0中得到了修复。因此，请更改pubspec.yaml文件中的版本

google_sign_in_web: ^0.9.1

2020年4月20日更新：如果您对谷歌登录有依赖关系，请在pubspec.yaml文件中更改该版本

google_sign_in: 4.4.3

之前： 然而，当你像我一样，对谷歌登录有依赖时，你还有更多的东西需要改变。。。 如果将google_sign_in_web更改为0.9.0，并将google_sign_in的版本更改为4.4.1，则检索包将失败：

Because ${your_project_name} depends on google_sign_in 4.4.1 which depends on google_sign_in_web ^0.8.2, google_sign_in_web ^0.8.2 is required.
So, because ${your_project_name} depends on google_sign_in_web ^0.9.0, version solving failed.
pub get failed (1; So, because  ${your_project_name} depends on google_sign_in_web ^0.9.0, version solving failed.)

在这种情况下，您必须等待google_登录升级（我创建了pull请求），或者暂时像我一样执行以下操作：

1） 从中克隆flatter插件

2） 在/src/plugins/plugins/packages/google\u sign\u in/google\u sign\u in/pubspec.yaml中更改文件pubspec.yaml

  google_sign_in_web: ^0.9.0

3） 更改项目中的依赖项以指向更改后的google\u登录版本，即

google_sign_in:
  path: ../../flutter/plugins/packages/google_sign_in/google_sign_in
google_sign_in_web: ^0.9.0

---

出于某些原因，较新版本的颤振不再支持此格式的依赖项：

折叠单元：“^0.1.2”

相反，请检查您的pubspec.yaml并将该格式的任何依赖项更改为：

折叠单元：^1.0.0

我以折叠单元为例。 这为我解决了问题，希望对别人有所帮助

google_sign_in:
  path: ../../flutter/plugins/packages/google_sign_in/google_sign_in
google_sign_in_web: ^0.9.0