1. Get Your Node.js Under
Control with TypeScript
Yaniv Rodenski
Senior Architect
Level: Intermediate - Advanced

2. About me:
• Senior Architect – Sela Group
• Windows Azure MVP
• Coauthor of Developing Windows Azure
and Web Services (MOC 20487)
• Developing software professionally since
1997

3. About 1997:

4. About 1997:
Script-based server side
Shared hosting environment
Browser wars
New HTML standard that will
“Change the World”
This guy was the PM of Israel

5. Agenda:
• Introduction to Node.js
• Introduction to TypeScript
• Getting Node.js under control

6. Back to the future – Node.js
• A JavaScript runtime that is designed for
asynchronous IO operations
• Very lightweight and fast
• Used by a growing number of companies:

7. The Node.js ecosystem
• Web frameworks
– Express.js
– Socket.io
• Database support
– MongoDB
– SQL Server
• Hosting and Cloud environments
– IIS, Azure
– Forever, PM2

8. Demo
Hello Node.js

9. Wait! JavaScript on the server side?
• JavaScript is considered a second-class
language:
• "JavaScript is Assembly Language for the Web“ - Erik
Meijer
• “You can write large programs in JavaScript. You just
can’t maintain them.” - Anders Hejlsberg

10. Hmmm

11. JavaScript benefits
• But JavaScript is a powerful language:
• Functional
• Object Oriented
• Dynamic
• Great runtimes
• Huge community
• Tools

12. Demo
Fun with dynamic typing

13. So what is TypeScript?
• TypeScript is one of many new JavaScript
front ends:
– DART
– CoffeeScript
– ClojureScript
• A JavaScript superset
• Introduces static typing for JavaScript
• Some ECMAScript 6 features

14. Key Features:
Support
standard
JavaScript
code
Provides
static
typing
Encapsulatio
n through
classes and
modules
Support for
constructors,
properties
and
functions
Interfaces
and enums
support
Lambda
support =>
Intellisense
and syntax
checking

15. Demo
Getting TypeScript

16. Demo
Fun with static typing

17. How good is the TypeScript output?

18. Demo
TypeScript and Node.js

19. Synchronous server operations
Client
DBServer
Client

20. Asynchronous server operations
Client
DBServer
Client

21. Express
• ExpressJS is a web application framework
inspired by Sinatra
• Minimal and flexible
• Provide a quasi-MVC server side
development

22. Demo
Doing cool things with Express

24. Summary
• Node.js is a powerful and lightweight out-
of-browser JavaScript environment
• JavaScript is a powerful language by itself
• TypeScript provides optional static typing
and cleaner syntax and tools, which can
be handy while developing large
applications and exposing APIs

25. Resources
• Node.js: http://nodejs.org/
• TypeScript: http://www.typescriptlang.org/
• Slides and Demos: http://sdrv.ms/152qU0b
• Definitely Typed:
https://github.com/borisyankov/DefinitelyT
yped
• Twitter: @YRodenski