How to run a post-install script after individual execution of "npm install <package>"

You can use npm hook scripts to do something after package is installed.

Create node_modules/.hooks/postinstall executable and it will be run also after npm install <package>.

NOTE: I have noticed problems with npm hook scripts between npm version 5.1.0 until 6.0.1. So if you have problems with hooks, check your npm version and upgrade if necessary.