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?

seems not to be the same .angular-cli.json is not needed anymore. Reinstall didn't help — Juri
– Juri, Commented Jun 14, 2018 at 11:35
yes. Last step - rxjs migration seems not to affect this issue. But i'm not sure — Juri
– Juri, Commented Jun 14, 2018 at 11:59

Juri · Accepted Answer · 2018-07-09 07:01:04Z

17

Reinstall typescript cleanly

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

answered Jul 9, 2018 at 7:01

Juri

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Comments

Beniamin · Accepted Answer · 2022-03-02 11:50:35Z

0

I've spent way too much time for this. Due to specific folder structure the problem was with root path inside angular.json. It pointed to .. which was 'outside' of the project instead of root folder.

answered Mar 2, 2022 at 11:50

Beniamin

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