Dart混乱TYPE错误 [英] Dart confusing TYPE error

问题描述

我正在使用dart和web_ui构建web应用程序。

一切正常，直到我添加了web_ui pub，现在，当我试图运行build.dart文件我得到一个错误：

 未捕获错误：type'AttributeName'不是'String'类型的子类型'名称'。 
  

这是什么意思？

从我的理解，这意味着有一个名为'name'的类'AttributeName'的实例是扩展'String'类。

我搜索了整个项目，没有一个名为AttributeName的类，没有name的实例。

最新的Dart编辑器和SDK：

  Dart编辑器版本0.4.7_r21658 
 Dart SDK版本0.4.7.5_r21658 
  

编辑：
这是我的build.dart文件：

  import'package：web_ui / component_build.dart'; 
 import'dart：io'; 
 
 void main（）{
 build（new Options（）。arguments，['web / menyplattan.html']）; 
} 
  

此外，我更新了所有的pub

类似的 SO问题 MarioP链接有一个stacktrace显示这个消息来自web ui库本身。

你的html中有一个xmlns属性吗？
请查看此网络用户问题。 / p>

AttributeName 在html5lib库中定义。也许web-ui期待这个库的较新版本，但得到一个较旧的。确保您已完成发布栏安装。您也可以尝试删除您的软件包文件夹，并执行一个新的pub安装。

这可能是由过时的软件包，但也可能是一个错误web-ui。查看您是否可以获取stacktrace并提交错误报告，或者发布网络ui邮寄名单。 p>

I am building a web application using dart with web_ui.

Everything was working fine until i added the web_ui pub, and now, when I am trying to run a build.dart file I get an error:

Uncaught Error: type 'AttributeName' is not a subtype of type 'String' of 'name'.

What does this mean?

From what I understand, this means there is somewhere an instance named 'name' of class 'AttributeName' that is extending 'String' class.

I searched my entire project and there is nowhere a class named 'AttributeName', nowhere an instance of 'name'.

I have the latest Dart editor and SDK:

Dart Editor version 0.4.7_r21658
Dart SDK version 0.4.7.5_r21658

EDIT: this is my build.dart file:

import 'package:web_ui/component_build.dart';
import 'dart:io';

void main() {
  build(new Options().arguments, ['web/menyplattan.html']);
}

Also, i updated all the pubs

解决方案

This message looks like web_ui is failing a type check.

The similar SO question MarioP links to has a stacktrace showing this message coming from within the web ui library itself.

Do you have an xmlns attribute in your html? Have a look at this web-ui issue.

AttributeName is defined within the html5lib library. Perhaps web-ui is expecting a newer version of this library but getting an older one. Make sure you've done a pub install. You can also try deleting your packages folder and doing a fresh pub install.

This could be caused by out-of-date packages, but it could also be a bug in web-ui. See if you can get a stacktrace and file a bug report, or post it on the web-ui mailing list.

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