javascript - 在 Dart 中编译 Polymer 应用

Question

我正在使用 Dart 0.8.10_r30104 (DEV)，发现它无法生成 Javascript(不过应用程序本身可以在 Dartrium 中运行)。

当我在builder.dart上选择“生成Javascript”时提示错误:

--- Nov 12, 2013 7:35:43 AM Running dart2js... ---
F:\dart\dart-sdk\bin\dart2js.bat --out=E:\My Books\Sitepoint\Sample\build.dart.js E:\My Books\Sitepoint\Sample\build.dart
/E:/My Books/Sitepoint/Sample/packages/polymer/builder.dart:83:8: Error: Library not found 'dart:io'.
import 'dart:io';
   ^^^^^^^^^
/E:/My Books/Sitepoint/Sample/packages/polymer/src/build/linter.dart:11:8: Error: Library not found 'dart:io'.
import 'dart:io';
   ^^^^^^^^^
/E:/My Books/Sitepoint/Sample/packages/barback/src/asset.dart:9:8: Error: Library not    found 'dart:io'.
import 'dart:io';
   ^^^^^^^^^
...
/E:/My Books/Sitepoint/Sample/packages/analyzer/src/generated/element.dart:7220:17: Hint: The class 'VoidTypeImpl' overrides 'operator==', but not 'get hashCode'.
   bool operator ==(Object object) => identical(object, this);
            ^^
/E:/My Books/Sitepoint/Sample/packages/analyzer/src/generated/element.dart:4874:17:     Hint: The class 'PropertyAccessorElementImpl' overrides 'operator==', but not 'get hashCode'.
  bool operator ==(Object object) => super == object && identical(isGetter, ((object as PropertyAccessorElement)).isGetter);
            ^^
Error: Compilation failed.

===

出了什么问题？

Answer 1

要为 polymer 应用程序生成 JS，您需要在应用程序的顶层运行“pub build”。这将创建一个名为 build 的顶级目录，其中包含您的 JS(以及指向 JS 的 html)。