Ao executar o comando ng serve --open é apresentado o seguinte erro:
Could not find module "@angular-devkit/build-angular" from "C:\Users\lucas.fernandes\Desktop\alurapic". Error: Could not find module "@angular-devkit/build-angular" from "C:\Users\lucas.fernandes\Desktop\alurapic". at Object.resolve (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\nodemodules@angular-devkit\core\node\resolve.js:141:11) at Observable.rxjs_1.Observable [as subscribe] (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\nodemodules@angular-devkit\architect\src\architect.js:132:40) at Observable.trySubscribe (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\nodemodules\rxjs\internal\Observable.js:44:25) at Observable.subscribe (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\nodemodules\rxjs\internal\Observable.js:30:22) at DoOperator.call (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\nodemodules\rxjs\internal\operators\tap.js:32:23) at Observable.subscribe (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\nodemodules\rxjs\internal\Observable.js:25:31) at Object.subscribeToResult (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\nodemodules\rxjs\internal\util\subscribeToResult.js:12:23) at MergeMapSubscriber.innerSub (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\node_modules\rxjs\internal\operators\mergeMap.js:82:29) at MergeMapSubscriber.tryNext (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\node_modules\rxjs\internal\operators\mergeMap.js:76:14) at MergeMapSubscriber.next (C:\Users\lucas.fernandes\AppData\Roaming\npm\nodemodules@angular\cli\node_modules\rxjs\internal\operators\mergeMap.js:59:18)
Esse erro ocorreu dps que reinstalei o rxjs.