【发布时间】：2017-05-19 07:11:26
【问题描述】：
有谁知道在使用 Angular CLI 和 AOT 编译时如何获得更详细的错误堆栈跟踪？使用 JIT 编译运行时，我的应用程序没有问题，但是当我运行 ng build --aot 时，我得到的只是：TypeError: Cannot read property "length" of undefined。没有信息哪里是错误的来源。我想我的一个模板中存在一些问题，但我不知道哪一个是问题。
我正在使用最新版本的 Angular CLI (1.0.0-beta.24) 和 Angular 2 (2.4.1)。
编辑
这是编译器在使用ng serve --aot 命令时发出的完整消息：
Cannot read property 'length' of undefined
./app/main.ts
Module not found: Error: Can't resolve './$$_gendir/app.module.ngfactory' in 'C:\frontend-angular-cli\app'
resolve './$$_gendir/app.module.ngfactory' in 'C:\frontend-angular-cli\app'
using description file: C:\frontend-angular-cli\package.json (relative path: ./app)
Field 'browser' doesn't contain a valid alias configuration
after using description file: C:\frontend-angular-cli\package.json (relative path: ./app)
using description file: C:\frontend-angular-cli\package.json (relative path: ./app/$$_gendir/app.module.ngfactory)
as directory
C:\frontend-angular-cli\app\$$_gendir\app.module.ngfactory doesn't exist
no extension
Field 'browser' doesn't contain a valid alias configuration
C:\frontend-angular-cli\app\$$_gendir\app.module.ngfactory doesn't exist
.ts
Field 'browser' doesn't contain a valid alias configuration
C:\frontend-angular-cli\app\$$_gendir\app.module.ngfactory.ts doesn't exist
.js
Field 'browser' doesn't contain a valid alias configuration
C:\frontend-angular-cli\app\$$_gendir\app.module.ngfactory.js doesn't exist
[C:\frontend-angular-cli\app\$$_gendir\app.module.ngfactory]
[C:\frontend-angular-cli\app\$$_gendir\app.module.ngfactory]
[C:\frontend-angular-cli\app\$$_gendir\app.module.ngfactory.ts]
[C:\frontend-angular-cli\app\$$_gendir\app.module.ngfactory.js]
@ ./app/main.ts 8:0-70
@ multi main
./~/@angular/core/src/linker/system_js_ng_module_factory_loader.js
Module not found: Error: Can't resolve 'C:\frontend-angular-cli\app\$$_gendir' in 'C:\frontend-angular-cli\node_modules\@angular\core\src\linker'
resolve 'C:\frontend-angular-cli\app\$$_gendir' in 'C:\frontend-angular-cli\node_modules\@angular\core\src\linker'
using description file: C:\frontend-angular-cli\node_modules\@angular\core\package.json (relative path: ./src/linker)
Field 'browser' doesn't contain a valid alias configuration
after using description file: C:\frontend-angular-cli\node_modules\@angular\core\package.json (relative path: ./src/linker)
using description file: C:\frontend-angular-cli\package.json (relative path: ./app/$$_gendir)
as directory
C:\frontend-angular-cli\app\$$_gendir doesn't exist
[C:\frontend-angular-cli\app\$$_gendir]
@ ./~/@angular/core/src/linker/system_js_ng_module_factory_loader.js 69:15-36 85:15-102
@ ./~/@angular/core/src/linker.js
@ ./~/@angular/core/src/core.js
@ ./~/@angular/core/index.js
@ ./app/main.ts
@ multi main
【问题讨论】：
-
应该发布一些代码..变量的“长度”如何？
-
应用程序相当复杂。它有数百个模板和相应的 .ts 文件，因此很遗憾无法发布代码。在 JIT 编译中开发时，当我尝试通过未初始化的变量或空数组使用 *ngFor 指令循环时，通常会发生这种错误（“无法读取属性“长度”...）。但是，正如我所提到的，没有这样的错误使用 JIT 编译。也许可以在 tsconfig.json 中放置一些东西，这会强制编译器显示完整的堆栈跟踪以显示此类错误？
-
afaik beta.24 应该适用于 Angular 2.3.1
标签： angular angular-cli angular2-aot