visual code intellisense node js

I'm using VS code 1.10 but the intellisense is not always working as I would expect.

For instance, I'm require a module('simple-hl7') which I've installed locally with NPM. This module has properly been added to my pacakge.json as a dependecy.

With ATA I would have expect intellisense function out-of-the-box.

is there something I'm missing?

In the screenshot below I would have expect addsegemnt function to be poped-up in the intellisense pop-up

screenshot

via user3166671