Is it possible to install npm package only if it has not been already installed?

Question

Is it possible to install npm package only if it has not been already installed?

I need this to speed up test on CircleCI, but when I run npm inst

Answer 1

You could try npm list protractor || npm install protractor@2.1.0

Where npm list protractor is used to find protractor package.

If the package is not found, it will return npm ERR! code 1 and do npm install protractor@2.1.0 for installation