TypeScript for Node.Js

"Tame your JavaScript"

Jeremy Likness

Cloud Developer Advocate for Microsoft
  • 20 Years Professional Developer
  • Author of books and articles, both online and print
  • Prolific speaker
  • 100% plant-based diet and CrossFit

Wat?!


						
				
				
							
...

						
			


			

				
Evolution

				
			


			

				
Harmony? ECMAScript 2015? Babel?

				
Popular options.

				
Includes: classes, lexical scope, lambda...

				
Lacks …

				
    
					
  • Interfaces
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  • Dynamic module affinity (System.js, Require.js, etc.)
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  • External library definitions
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  • Generics
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Real World

					
Discovery

					
Intent is clearer with types and interfaces.

				

				

					
Real World

					
Documentation

					
Libraries make it easier to discover and learn how to use APIs.

				

				

					
Real World

					
Development Time Security

					
Less "fat-finger", catch bugs earlier in the cycle.

				

				

					
Real World

					
Scope Safety

					
Modules, Classes, and Lambdas take care of this.

				

				

					
Real World

					
Team Scale

					
Easier for multiple teams and members to work in parallel.

				

				

					
Real World

					
Increased Velocity

					
Team had 4x velocity with TypeScript vs. just JavaScript. Oh, and the Angular team uses it, for goodness' sake!

				

			


			

				
Demo Time!

				
			


			

				

					
TypeScript and Node.js

					
    
						
  • First class support
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  • IDE integration
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  • Libraries (and automatic generation)
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  • Configurable options
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Getting Started

					
    
						
  • npm init -y
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  • npm i typescript --save-dev
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  • npm i @types/node --save-dev
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  • node tsc --init
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Demo

					
Examining tsconfig.json.

					
				

				

					
The App

					
    
						
  • Edit tsconfig.json
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  • Add "main": "lib/main" and "types": "lib/main" to package.json
						
  • Create src directory
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  • Add code
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  • Build and run!
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Demo

						
First app.

						
					

				

				

						
Demo

						
Full enchilada.

						https://github.com/JeremyLikness/micro-locator
						
					

				
				

					
Questions?

					
@JeremyLikness

					
https://blog.jeremylikness.com/

					
https://github.com/JeremyLikness/typescript-for-node