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?

Related: https://stackoverflow.com/questions/44611526/how-to-fix-cannot-find-module-typescript-in-angular-4 — Michael Doye, Jun 14 '18 at 11:24
seems not to be the same .angular-cli.json is not needed anymore. Reinstall didn't help — Juri, Jun 14 '18 at 11:35
yes. Last step - rxjs migration seems not to affect this issue. But i'm not sure — Juri, Jun 14 '18 at 11:59
@developer i dont know exactly what i did, but it works now. Maybe some package wasn't installed correctly (i had some issues with corporate proxy). Project typescript version is 2.7.2 — Juri, Jul 09 '18 at 06:52
Thanks Juri, it worked for me after installing typescript cleanly. — developer, Jul 09 '18 at 06:53

score 17 · Accepted Answer · answered Jul 09 '18 at 07:01

17

Reinstall typescript cleanly

- npm uninstall -g typescript
- npm uninstall typescript
- npm install -g typescript
- npm install typescript@2.7.2

answered Jul 09 '18 at 07:01

Juri

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score 0 · Answer 2 · answered Mar 02 '22 at 11:50

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 02 '22 at 11:50

Beniamin

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

2 Answers2