title: ng serve : Could not find module "@angular-devkit/build-angular"
body: <p>I know this question already has an answer <a href="https://stackoverflow.com/questions/50333003/could-not-find-module-angular-devkit-build-angular">here</a>, however none of the answers fixed it for me, I still get that stack trace :</p>
  
  <pre><code>Could not find module "@angular-devkit/build-angular" from "F:\\Documents\\...".
  Error: Could not find module "@angular-devkit/build-angular" from "F:\\Documents\\...".
      at Object.resolve (C:\Users\...\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\...\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\src\architect.js:132:40)
      at Observable._trySubscribe (C:\Users\...\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:44:25)
      at Observable.subscribe (C:\Users\...\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:30:22)
      at C:\Users\...\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:99:19
      at new Promise (&lt;anonymous&gt;)
      at Observable.toPromise (C:\Users\...\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:97:16)
      at ServeCommand.initialize (C:\Users\...\AppData\Roaming\npm\node_modules\@angular\cli\models\architect-command.js:130:86)
      at process._tickCallback (internal/process/next_tick.js:68:7)
      at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
  </code></pre>
  
  <p>My global npm dependencies are in <code>C:</code>, but my project folder and therefore project dependencies are in <code>F:</code></p>
  
  <p>I have tried :</p>
  
  <ul>
  <li>Installing the module with npm both locally and globaly</li>
  <li>Deleting package-lock, local node_modules, global node_modules and npm-cache</li>
  <li>Uninstalling then installing node</li>
  <li>Generating a new app with <code>ng new</code>, then launching it with <code>npm start/ng serve</code> produces the same error</li>
  </ul>
  
  <p>Here is my package.json :</p>
  
  <pre><code>{
    "name": "...",
    "version": "0.0.0",
    "scripts": {
      "ng": "ng",
      "start": "ng serve",
      "build": "ng build",
      "test": "ng test",
      "lint": "ng lint",
      "e2e": "ng e2e",
      "prod": "ng build --prod"
    },
    "private": true,
    "dependencies": {
      "@angular/animations": "~7.1.0",
      "@angular/cdk": "^7.2.1",
      "@angular/common": "~7.1.0",
      "@angular/compiler": "~7.1.0",
      "@angular/core": "~7.1.0",
      "@angular/flex-layout": "^7.0.0-beta.23",
      "@angular/forms": "~7.1.0",
      "@angular/platform-browser": "~7.1.0",
      "@angular/platform-browser-dynamic": "~7.1.0",
      "@angular/router": "~7.1.0",
      "core-js": "^2.6.2",
      "moment": "^2.23.0",
      "ngx-moment": "^3.3.0",
      "rxjs": "^6.3.3",
      "rxjs-compat": "^6.3.3",
      "tslib": "^1.9.0",
      "zone.js": "^0.8.27"
    },
    "devDependencies": {
      "@angular-devkit/build-angular": "^0.12.1",
      "@angular-devkit/core": "^7.2.1",
      "@angular/cli": "~7.2.1",
      "@angular/compiler-cli": "~7.1.0",
      "@angular/language-service": "~7.1.0",
      "@types/jasmine": "~2.8.8",
      "@types/jasminewd2": "~2.0.3",
      "@types/node": "~8.9.4",
      "codelyzer": "~4.5.0",
      "jasmine-core": "~2.99.1",
      "jasmine-spec-reporter": "~4.2.1",
      "karma": "~3.1.1",
      "karma-chrome-launcher": "~2.2.0",
      "karma-coverage-istanbul-reporter": "~2.0.1",
      "karma-jasmine": "~1.1.2",
      "karma-jasmine-html-reporter": "^0.2.2",
      "protractor": "~5.4.0",
      "ts-node": "~7.0.0",
      "tslint": "~5.11.0",
      "typescript": "~3.1.6"
    }
  }
  </code></pre>