Angular 6 ng build Cannot read property 'length' of undefined TypeError: Cannot read property 'length' of undefined at levenshtein

Question

我发现了这个错误 in another question 但没有解决，所以我想问是否有人可以帮我解决这个问题：

我正在使用 Angular 6 & 如果我使用 ng s 应用程序在本地运行得很好，也使用 ng s --aot 工作正常，但是，如果我从 angular 构建生产版本，我会收到以下错误，而没有任何参考它的原因（在我的代码中）

注意：我之前已经成功制作了多个产品构建

如何找出是哪个变量或属性导致的？

谢谢

ng -build -prod
    Cannot read property 'length' of undefined
    TypeError: Cannot read property 'length' of undefined
        at levenshtein (D:Angular\node_modules\@angular\cli\models\command-runner.js:58:23)
        at listAllCommandNames.sort (D:Angular\node_modules\@angular\cli\models\command-runner.js:69:43)
        at Array.sort (native)
        at Object.<anonymous> (D:Angular\node_modules\@angular\cli\models\command-runner.js:67:65)
        at Generator.next (<anonymous>)
        at D:Angular\node_modules\@angular\cli\models\command-runner.js:7:71
        at new Promise (<anonymous>)
        at __awaiter (D:Angular\node_modules\@angular\cli\models\command-runner.js:3:12)
        at Object.runCommand (D:Angular\node_modules\@angular\cli\models\command-runner.js:28:12)
        at D:Angular\node_modules\@angular\cli\lib\cli\index.js:60:58

Answer 1

感谢 hrdkisback 的精彩评论，我发现了问题

我遇到了同样的错误，我花了几个小时才解决，因为这个错误误导了我，实际上是因为我尝试了这 2 个错误的命令：

ng -build -prod
ng -build --prod

上面的两个命令都出现了这个错误，所以我认为我的代码有问题并一直在寻找它，解决方案只是使用下面的正确命令：

ng build --prod

Angular 6 ng build Cannot read property 'length' of undefined TypeError: Cannot read property 'length' of undefined at levenshtein

Angular 6 ng build Cannot read property 'length' of undefined TypeError: Cannot read property 'length' of undefined at levenshtein

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typescript

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angular6