How to Import Intellisense files into vsCode (Visual Studio Code)

I'm not sure I understand how the intellisense works for Microsoft's new vsCode text editor. In the docs under the "Great Code Editing Experience" heading, it shows a warning under the node global variable __dir and offers a lightbulb suggestion to add a reference to a d.ts file so you can get intellisense for node:

I have 2 questions:

1 - How do I import DefinitelyTyped files (d.ts) directly (without editor suggesting it) or do I have to copy them from the github source and put them in a typings directory?

2 - Can I get intellisense for any library that has a typescript definition? I tried the below, but when I type in express. or when. , I don't get any intellisense. However, I do get node intellisense.

/// <reference path="../typings/node/node.d.ts"/>
/// <reference path="../typings/express/express.d.ts" />

var when    = require('when')
  , express = require('express')
  , gulp    = require('gulp')

UPDATE: August 2016: TSD is now depreciated. instead use https://www.npmjs.com/package/typings

npm install typings --global

OR

If using VS2015 NodeJS v1.2 released 29th July 2016 then typings-core@1.3.1 is installed automatically for you during first use:

Executing command 'npm install "C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 14.0\COMMON7\IDE\EXTENSIONS\MICROSOFT\NODE.JS TOOLS FOR VISUAL STUDIO\1.2\TypingsAcquisitionTool"
ntvs-typings-acquisition-tool@1.0.0 ..\..\..\..\..\node_modules\ntvs-typings-acquisition-tool
├── minimist@1.2.0
└── typings-core@1.3.1 (array-uniq@1.0.3, thenify@3.2.0, zip-object@0.1.0, popsicle-status@2.0.0, popsicle-retry@3.2.1, listify@1.0.0, promise-finally@2.2.1, xtend@4.0.1, graceful-fs@4.1.5, throat@3.0.0, lockfile@1.0.1, strip-bom@2.0.0, sort-keys@1.1.2, string-template@1.0.0, make-error-cause@1.2.1, any-promise@1.3.0, has@1.0.1, rc@1.1.6, object.pick@1.1.2, debug@2.2.0, mkdirp@0.5.1, invariant@2.2.1, configstore@2.0.0, parse-json@2.2.0, touch@1.0.0, detect-indent@4.0.0, is-absolute@0.2.5, popsicle-proxy-agent@3.0.0, rimraf@2.5.4, popsicle@8.0.4, typescript@1.8.7)

-----Original Answer-----

There is a package manager for Typescript Definition Files. This is a community driven repository containing Typescript definitions for many popular libraries.

You can install tsd by following the instructions here.

Once you install tsd globally, you can install packages from your project root in the command line like this:

$ tsd install express --save

This will create a typings directory if one doesn't exist and adds an express directory with an express.d.ts file inside.

It also creates a tsd.d.ts file that contains the references to all of your tsd files. If I install a few more tsd's, here is what it looks like.

Now to access my tsd files, all I need to do is reference their path in at the top of my code with /// <reference path="typings/tsd.d.ts" />

Now I get intellisense.