Cannot find module 'webpack' - Angular

Question

I just migrated my project from angular v5.x to v6.x and now when I try to start it with ng serve I'm getting:

Cannot find module 'webpack'
Error: Cannot find module 'webpack'
  at Function.Module....

any help ?

I cleared node modules and:

• npm cache clean --force
• npm install
• npm install --save-dev @angular/cli@latest

but that didn't help

Answer 1

I had the same issue and this worked for me:

1. Delete these files/ folders (from your Angular root folder):
   

   • package-lock.json (Not the package.json)
   • /node_modules folder
   • /dist folder

2. Execute command (regenerate the package-lock.json and the /node_modules):
   

   • $npm install
     

Everything should work now, it was the package-lock.json that caused npm to download old versions of dependencies.