node.js - 使用 ng 服务找不到模块 "@angular-devkit/build-angular"

Question

学习 Angular ，尝试做those simple steps用于生成新项目，但是当我尝试启动 ng-serve 时，我收到了这些错误:

 Could not find module "@angular-devkit/build-angular" from "C:\\Users\\lingar\\AngularProjects2\\project1".
    Error: Could not find module "@angular-devkit/build-angular" from "C:\\Users\\lingar\\AngularProjects2\\project1".
        at Object.resolve (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\core\node\resolve.js:141:11)
        at Observable.rxjs_1.Observable [as _subscribe] (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\src\architect.js:132:40)
        at Observable._trySubscribe (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:43:25)
        at Observable.subscribe (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:29:22)
        at DoOperator.call (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\operators\tap.js:29:23)
        at Observable.subscribe (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:24:22)
        at C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\util\subscribeTo.js:22:31
        at Object.subscribeToResult (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\util\subscribeToResult.js:7:45)
        at MergeMapSubscriber._innerSub (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\operators\mergeMap.js:75:38)
        at MergeMapSubscriber._tryNext (C:\Users\lingar\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\operators\mergeMap.js:72:14)

已经尝试了很多those solutions没有成功。

有人有想法吗？

编辑:已解决!

感谢 @Seth McClaine 在评论中的回答，我去了 the Technical Specifications of this module @angular-devkit/build-angular ,

从那里我获取了安装命令并在 cmd 上运行它:

npm 我@angular-devkit/build-angular，

从那时起它就运行良好。

顺便说一句 - 我在解决方案之前遇到了一个奇怪的问题，即只有在根用户目录中它才能正常工作。

@angular-devkit/build-angular specification

Answer 1

try this.

npm i --only=dev

after that npm install and run you project