Can't get the module to work as an npm dependency

[ukilon-okta]

We are trying to wrap this library and add extra functionality in an internal library.
The goal is to run npm-shrinkwrap, and once itd complete, add our extra sugar.
However, I couldn't get it to work
code:

var npmShrinkwrap = require('npm-shrinkwrap');
npmShrinkwrap({dev: true}, function (err, optionalWarnings) {
  console.log('ok');
});

Any help will be highly appreciated!

My environment:

• Mac OS X Yosemite
• node v5.6.0
• npm v3.8.9