is-npm 
Check if your code is running as an npm script
Install
$ npm install --save is-npm
Usage
var isNpm = require('is-npm');
console.log(isNpm);
$ node foo.js
#=> false
$ npm run foo
#=> true
License
MIT © Sindre Sorhus
Check if your code is running as an npm script
$ npm install --save is-npm
var isNpm = require('is-npm');
console.log(isNpm);
$ node foo.js
#=> false
$ npm run foo
#=> true
MIT © Sindre Sorhus