Cannot find module 'webpack' - Angular

I fixed this issue with:

delete package-lock.json
delete node_modules
delete dist (if exist)

npm cache clean --force

npm install

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.