无法读取角度4中未定义的属性"长度"

Question

我是Angular 4中的新手,并试图弄清楚一个简单项目的基本结构.我已经测试了我的项目,昨天工作得很好.但今天当我打开我的项目并想要"服务"时,它显示以下错误.不知道是什么问题.

TypeError: Cannot read property 'length' of undefined
at createSourceFile (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:15457:109)
at parseSourceFileWorker (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:15389:26)
at Object.parseSourceFile (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:15338:26)
at Object.createSourceFile (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:15192:29)
at VirtualFileStats.getSourceFile (C:\Users\IR\Desktop\angular-first-project\node_modules\@ngtools\webpack\src\compiler_host.js:66:35)
at WebpackCompilerHost.getSourceFile (C:\Users\IR\Desktop\angular-first-project\node_modules\@ngtools\webpack\src\compiler_host.js:213:38)
at findSourceFile (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:67909:29)
at processImportedModules (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:68056:25)
at findSourceFile (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:67937:17)
at processSourceFile (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:67840:27)
at processRootFile (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:67728:13)
at C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:67018:60
at Object.forEach (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:1449:30)
at Object.createProgram (C:\Users\IR\Desktop\angular-first-project\node_modules\typescript\lib\typescript.js:67018:16)
at AotPlugin._setupOptions (C:\Users\IR\Desktop\angular-first-project\node_modules\@ngtools\webpack\src\plugin.js:129:28)
at new AotPlugin (C:\Users\IR\Desktop\angular-first-project\node_modules\@ngtools\webpack\src\plugin.js:26:14)

提前致谢.

Answer 1

我已经在随机的场合看到过这种类型的错误,例如在将组件移动到不同的文件夹之后,即使在所有引用被查询以匹配新路径之后也是如此.

使用ng-build重建项目应该有所帮助.