Angular-cli: ERROR [preprocess]: Can not load "webpack"! TypeError: Cannot read property 'plugin' of undefined

[ravidannani]

After installing angular cli, I ran the below commands and able to open the application on browser.
ng new my-dream-app
cd my-dream-app
ng serve

But inorder to do testing, executed ng test command, but getting the below issue. Not sure how to proceed further.

Could you please let me know if i did any mistake.

[ebuychance]

I ran into this same issue. I was able to add

"@ngtools/webpack": "^1.6.2"

to the devDependencies as a fix for a newly generated project but this temp fix did not work with another recently created app I developed.
I read about adding a tsconfig.spec.ts as a fix as well here: https://github.com/angular/angular-cli/issues/6457

Currently still unable to fix my issue.

[amrography]

+1

[ebuychance]

ng -v
angular-cli: 1.0.0-beta.28.3
node: 8.3.0
os: win32 x64

Upgrading to @angular/cli: 1.3.2 solved my issues.

[Brocco]

It appears you have a much older version of the CLI (still using the package name angular-cli)

You will want to remove that package and install the current version...

npm uninstall angular-cli -g
npm install @angular/cli -g

Also, you'll want to ensure your versions are up to date, which you can find under prerequisites

[uglycoyote]

I got burned by this as well. I did see the message when running ng test which said

As a forewarning, we are moving the CLI npm package to "@angular/cli" with the next release,

However, I read this as a forewarning about something that would happen in the future, where I should have read it as something which was in the near-future of the long-ago-past, which means it's still in the past from where the present currently is.

It would have been better if whoever typed the "forewarning" instead said something like "As of __DATE__, the angular-cli repository is deprecated and you should be using @angular/cli"

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