All NPM commands error with TypeError: Class extends value undefined is not a constructor or null

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I had the same issue. Had some older npm installation and when I ran the windows installer it failed.

I did the following:

  • use the installer (https://nodejs.org/en/download/) to remove node,npm
  • delete from c:/Users/YOURUSER/AppData/Roaming/npm-cache and nvm folders if available
  • remove c:/Program Files/node if available
  • remove Environment Variables all settings for NPM and NODE. There are both in user and system wide multiple entries.

Reinstall everything with the installer.

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