Error: EPERM: operation not permitted, open 'F:\projects\www\build\15.js'

Ionic Framework ionic-v3
2

In my situation it helped:

  1. clean cache with
npm cache clean --force
  1. install the latest version of npm globally as admin:
npm install -g npm@latest --force
  1. clean cache with
npm cache clean --force
  1. Try to install your component once again.

I hope this fix your issue. If it does not help, try to switch of antivirus program for a while and repeat.

This answers is comming from StackOverflow, all the credits is for @roman

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