title: getting ' ajv is not a constructor mini-css-extract-plugin ' error whenever installing package using npm
body: <p>whenever I'm trying to install a package from npm I'm getting the following error :
  <code>ajv is not a constructor , mini-css-extract-plugin</code>
  My project is now stopped due to this error I can't download any new package.
  This only works if I deleted node_modules and reinstalled it but the same happens again if I download a new package!
  Thanks for helping</p>