Can't build after angular migration from 5 to 6 - Cannot find module 'typescript'

Question

I'm migrating angular application from 5 to 6. Run

ng update @angular/cliand ng update @angular/core

But now if i run ng build, i get this error

Cannot find module 'typescript' from 'C:\..\App'
Error: Cannot find module 'typescript' from 'C:\..\App'
    at Function.module.exports [as sync] (C:\..\App\MyApp\node_modules\resolve\lib\sync.js:42:15)
    at resolveProjectModule (C:\..\App\MyApp\node_modules\@angular-devkit\build-angular\src\angular-cli-files\utilities\require-project-module.js:15:20)
    at Object.requireProjectModule (C:\..\App\MyApp\node_modules\@angular-devkit\build-angular\src\angular-cli-files\utilities\require-project-module.js:20:20)
    at BrowserBuilder.buildWebpackConfig (C:\..\App\MyApp\node_modules\@angular-devkit\build-angular\src\browser\index.js:103:52)
    at Observable.rxjs_1.Observable.obs [as _subscribe] (C:\..\App\MyApp\node_modules\@angular-devkit\build-angular\src\browser\index.js:35:38)
    at Observable._trySubscribe (C:\..\App\MyApp\node_modules\rxjs\internal\Observable.js:43:25)
    at Observable.subscribe (C:\..\App\MyApp\node_modules\rxjs\internal\Observable.js:29:22)
    at C:\..\App\MyApp\node_modules\rxjs\internal\util\subscribeTo.js:22:31
    at Object.subscribeToResult (C:\..\App\MyApp\node_modules\rxjs\internal\util\subscribeToResult.js:7:45)
    at MergeMapSubscriber._innerSub (C:\..\App\MyApp\node_modules\rxjs\internal\operators\mergeMap.js:75:38)
    at MergeMapSubscriber._tryNext (C:\..\App\MyApp\node_modules\rxjs\internal\operators\mergeMap.js:72:14)
    at MergeMapSubscriber._next (C:\..\App\MyApp\node_modules\rxjs\internal\operators\mergeMap.js:55:18)
    at MergeMapSubscriber.Subscriber.next (C:\..\App\MyApp\node_modules\rxjs\internal\Subscriber.js:64:18)
    at TapSubscriber._next (C:\..\App\MyApp\node_modules\rxjs\internal\operators\tap.js:62:26)
    at TapSubscriber.Subscriber.next (C:\..\App\MyApp\node_modules\rxjs\internal\Subscriber.js:64:18)
    at MergeMapSubscriber.notifyNext (C:\..\App\MyApp\node_modules\rxjs\internal\operators\mergeMap.js:84:26)

package.json includes"typescript": ">=2.7.0 <2.8.0" in devDependencies

Cleaned npm cache and reinstalled all packages but it didn't help.

Anybody with same issues?

Answer 1

Reinstall typescript cleanly

- npm uninstall -g typescript
- npm uninstall typescript
- npm install -g typescript
- npm install [email protected]