在 Angular2 应用程序中运行 ng 服务时出现错误“无法读取未定义的属性‘长度’”

Question

使用 angular-cli 命令 ng-serve 运行 angular2 应用程序时，我遇到以下问题

仪表板@0.0.0开始C：\ Users \ padmavathi \ Downloads \ phototype-development \ web \仪表板ng服务

Cannot read property 'length' of undefined
TypeError: Cannot read property 'length' of undefined
    at createSourceFile (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\typescript\lib\typescript.js:8980:109)
    at parseSourceFileWorker (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\typescript\lib\typescript.js:8940:26)
    at Object.parseSourceFile (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\typescript\lib\typescript.js:8899:26)
    at Object.createSourceFile (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\typescript\lib\typescript.js:8727:29)
    at new TypeScriptFileRefactor (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\@ngtools\webpack\src\refactor.js:25:35)
    at Object.resolveEntryModuleFromMain (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\@ngtools\webpack\src\entry_resolver.js:108:18)
    at AotPlugin._setupOptions (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\@ngtools\webpack\src\plugin.js:129:58)
    at new AotPlugin (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\@ngtools\webpack\src\plugin.js:37:14)
    at Object.exports.getWebpackNonAotConfigPartial (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\angular-cli\models\webpack-build-typescript.js:20:13)
    at new NgCliWebpackConfig (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\angular-cli\models\webpack-config.js:23:42)
    at Class.run (C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\angular-cli\tasks\serve-webpack.js:20:22)
    at C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\node_modules\angular-cli\commands\serve.js:102:26
    at process._tickCallback (internal/process/next_tick.js:103:7)

npm ERR! Windows_NT 6.3.9600
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "start"
npm ERR! node v6.9.1
npm ERR! npm  v3.10.8
npm ERR! code ELIFECYCLE
npm ERR! dashboard@0.0.0 start: `ng serve`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the dashboard@0.0.0 start script 'ng serve'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the dashboard package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     ng serve
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs dashboard
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls dashboard
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\Users\padmavathi\Downloads\phototype-development\web\dashboard\npm-debug.log.

请帮我解决这个问题。提前致谢。

Answer 1

有同样的问题。

我添加了

 if (!sourceText) console.log("createSourceFile " + fileName);

createSourceFile在位于下面的函数中\node_modules\typescript\lib\typescript.js

再次运行 ng build，记录所有文件。我设法查看丢失了什么文件并处理它。

Answer 2

当我们在重构过程中Cannot read property 'length' of undefined [...] at createSourceFile [...]意外删除时，我们遇到了同样的错误（ ）。environment.prod.ts恢复这个文件解决了我们的问题。

附言。Github 上也报告了一个问题：

• https://github.com/angular/angular-cli/issues/5053