[Angular] Error: Cannot find module '@angular-devkit/core'에러

cmd에서 ng new를 통하여 project생성 후

ng serve명령어를 날렸더니 발생한 Error: Cannot find module '@angular-devkit/core' 에러.

node_modules/@angular-devkit 경로에 가보니 core폴더가 생성되지 않았다.

npm install @angular-devkit/core --save-dev 명령어 호출 후 다시 ng serve를 했더니 해결되었음.

C:\workspace\jersey\src\main\angular-board>ng serve
module.js:540
    throw err;
    ^
 
Error: Cannot find module '@angular-devkit/core'
    at Function.Module._resolveFilename (module.js:538:15)
    at Function.Module._load (module.js:468:25)
    at Module.require (module.js:587:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (C:\workspace\jersey\src\main\angular-board\node_modules\@angular-devkit\schematics\src\tree\virtual.js:10:16)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
 
C:\workspace\jersey\src\main\angular-board>npm install @angular-devkit/core --save-dev
npm WARN @angular-devkit/schematics@0.0.52 requires a peer of @angular-devkit/core@0.0.29 but none is installed. You must install peer dependencies yourself.
npm WARN @schematics/angular@0.1.17 requires a peer of @angular-devkit/core@0.0.29 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
 
+ @angular-devkit/core@0.2.0
added 1 package in 10.694s
 
C:\workspace\jersey\src\main\angular-board>ng serve
** NG Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
Date: 2018-02-03T07:19:48.765Z
Hash: f91a4bf662c13657060f
Time: 5935ms
chunk {inline} inline.bundle.js (inline) 5.79 kB [entry] [rendered]
chunk {main} main.bundle.js (main) 19.9 kB [initial] [rendered]
chunk {polyfills} polyfills.bundle.js (polyfills) 555 kB [initial] [rendered]
chunk {styles} styles.bundle.js (styles) 33.9 kB [initial] [rendered]
chunk {vendor} vendor.bundle.js (vendor) 7.41 MB [initial] [rendered]
 
webpack: Compiled successfully.