Let's get started by building a simple application with TypeScript.
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calculator
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README.md
greeter.html
greeter.js
greeter.ts

README.md

Hello TypeScript!

sudo npm install -g typescript

tsc filename.ts

The result will be a file filename.js which contains the same JavaScript that you fed in. We're up and running using TypeScript in out JS app. Now we can start taking advantages of the new tools TypeScript offers:

Type Annotations, Interfaces, Classes.