angular-cli: An unhandled exception occurred: Cannot find module '@angular-devkit/core'

🐞 Bug report

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Is this a regression?

Description

Update my project from angular cli 8.3.25 to latest version

🔬 Minimal Reproduction

ng update @angular/cli @angular/core

🔥 Exception or Error




[error] Error: Cannot find module '@angular-devkit/core'
Require stack:
- C:\Users\Giacomo\Documents\Progetti\Angular\forMca\node_modules\@angular\core\schematics\utils\project_tsconfig_paths.js
- C:\Users\Giacomo\Documents\Progetti\Angular\forMca\node_modules\@angular\core\schematics\migrations\move-document\index.js
- C:\Users\Giacomo\AppData\Local\Temp\.ng-temp-packages-4EE2gk\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\tools\export-ref.js
- C:\Users\Giacomo\AppData\Local\Temp\.ng-temp-packages-4EE2gk\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\tools\index.js
- C:\Users\Giacomo\AppData\Local\Temp\.ng-temp-packages-4EE2gk\node_modules\@angular\cli\utilities\json-schema.js
- C:\Users\Giacomo\AppData\Local\Temp\.ng-temp-packages-4EE2gk\node_modules\@angular\cli\models\command-runner.js
- C:\Users\Giacomo\AppData\Local\Temp\.ng-temp-packages-4EE2gk\node_modules\@angular\cli\lib\cli\index.js
- C:\Users\Giacomo\AppData\Local\Temp\.ng-temp-packages-4EE2gk\node_modules\@angular\cli\lib\init.js
- C:\Users\Giacomo\AppData\Local\Temp\.ng-temp-packages-4EE2gk\node_modules\@angular\cli\bin\ng
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:980:15)
    at Function.Module._load (internal/modules/cjs/loader.js:862:27)
    at Module.require (internal/modules/cjs/loader.js:1040:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at C:\Users\Giacomo\Documents\Progetti\Angular\forMca\node_modules\@angular\core\schematics\utils\project_tsconfig_paths.js:19:20
    at C:\Users\Giacomo\Documents\Progetti\Angular\forMca\node_modules\@angular\core\schematics\utils\project_tsconfig_paths.js:10:17
    at Object.<anonymous> (C:\Users\Giacomo\Documents\Progetti\Angular\forMca\node_modules\@angular\core\schematics\utils\project_tsconfig_paths.js:16:3)
    at Module._compile (internal/modules/cjs/loader.js:1151:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1171:10)
    at Module.load (internal/modules/cjs/loader.js:1000:32)
    at Function.Module._load (internal/modules/cjs/loader.js:899:14)
    at Module.require (internal/modules/cjs/loader.js:1040:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at C:\Users\Giacomo\Documents\Progetti\Angular\forMca\node_modules\@angular\core\schematics\migrations\move-document\index.js:22:38
    at C:\Users\Giacomo\Documents\Progetti\Angular\forMca\node_modules\@angular\core\schematics\migrations\move-document\index.js:10:17
    at Object.<anonymous> (C:\Users\Giacomo\Documents\Progetti\Angular\forMca\node_modules\@angular\core\schematics\migrations\move-document\index.js:16:3)

🌍 Your Environment



     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 9.0.1
Node: 13.7.0
OS: win32 x64

Angular: 9.0.0
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router, service-worker
Ivy Workspace: Yes

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.900.1
@angular-devkit/build-angular      0.900.1
@angular-devkit/build-optimizer    0.900.1
@angular-devkit/build-webpack      0.900.1
@angular-devkit/core               9.0.1 (cli-only)
@angular-devkit/schematics         9.0.1
@angular/cdk                       8.2.3
@angular/cli                       9.0.1
@angular/flex-layout               8.0.0-beta.27
@angular/material                  8.2.3
@angular/material-moment-adapter   8.2.3
@angular/pwa                       <error>
@ngtools/webpack                   9.0.1
@schematics/angular                9.0.1 (cli-only)
@schematics/update                 0.900.1
rxjs                               6.5.4
typescript                         3.7.5
webpack                            4.41.2

Anything else relevant?

About this issue

Original URL
State: closed
Created 4 years ago
Comments: 27 (4 by maintainers)

Commits related to this issue

+ solving https://github.com/angular/angular-cli/issues/16868#issuecomment-583723830 — committed to nodm/the-weather by nodm 4 years ago
- solving https://github.com/angular/angular-cli/issues/16868#issuecomment-583723830 — committed to nodm/the-weather by nodm 4 years ago
Temp fix for An unhandled exception occurred: Cannot find module '@angular-devkit/core https://github.com/angular/angular-cli/issues/16868 — committed to by-pinja/ngx-resource-calendar by samikaur 4 years ago

Most upvoted comments

@clydin I solve with second solution:

- Install temporany latest version

npm install -D @schematics/angular @angular-devkit/core @angular-devkit/schematics

- Update angular

ng update @angular/cli @angular/core

- Remove package

npm uninstall @angular-devkit/schematics @schematics/angular @angular-devkit/core

But i don’t know what happen cold be something in global installation angular?

+11

Toso82 on Feb 8, 2020

just use npm update and try again

+10

firegbn on Apr 7, 2020

It appears that the package manager is placing some of the dependencies required by the migrations within @angular/core (and potentially @angular/material) in locations that are not resolvable to these migrations.

As a first step to attempt to remedy the situation, can you try the following:

Remove @angular-devkit/schematics from the package.json
Delete the node_modules directory and any associated lock files (package-lock.json or yarn.lock)
reinstall (npm install or equivalent for your package manager)
commit the new lock file and try the update

If this does not work then you may need to temporarily install the latest versions of @schematics/angular, @angular-devkit/core, and @angular-devkit/schematics prior to the update. And then remove them afterwards. (npm install -D @schematics/angular/npm install -D @angular-devkit/core/npm install -D @angular-devkit/schematics).

clydin on Feb 7, 2020

Just got the same issue, upgrading from version 10.0.8 to latest 11.0.2 @clydin 's solution worked (the second one: npm install --save-dev @schematics/angular @angular-devkit/core @angular-devkit/schematics, then doing the ng update @angular/cli @angular/core, and then uninstalling those 3 above)

And now I get more files updated by the migration (in my case: all the spec files - it adds waitForAsync - and the main/root routing config - it adds relativeLinkResolution: 'legacy'). Before, with the error, it was only updating tsconfig files of apps and libs and the angular.json file

MrCroft on Nov 19, 2020

An unhandled exception occurred: Cannot find module ‘@angular-devkit/build-angular/package.json’ Require stack:

C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\node_modules@angular-devkit\architect\node\node-modules-architect-host.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\node_modules@angular-devkit\architect\node\index.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\models\architect-command.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\commands\serve-impl.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\node_modules@angular-devkit\schematics\tools\export-ref.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\node_modules@angular-devkit\schematics\tools\index.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\utilities\json-schema.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\models\command-runner.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\lib\cli\index.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\lib\init.js
C:\Users\ELI\AppData\Roaming\npm\node_modules@angular\cli\bin\ng See “C:\Users\ELI\AppData\Local\Temp\ng-zTY9Wo\angular-errors.log” for further details.