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TypeScript

TypeScript. Anders Hejlsberg Technical Fellow 3-012. Application scale JavaScript development is hard. TypeScript is a language for application scale JavaScript development . TypeScript is a typed superset of JavaScript that compiles to plain JavaScript .

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TypeScript

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  1. TypeScript Anders Hejlsberg Technical Fellow 3-012

  2. Application scale JavaScriptdevelopment is hard.

  3. TypeScript is a language for application scaleJavaScript development.

  4. TypeScript is a typed superset of JavaScriptthat compiles to plain JavaScript.

  5. TypeScript is a typed superset of JavaScriptthat compiles to plain JavaScript.Any browser. Any host. Any OS. Open Source.

  6. TypeScript • Starts with JavaScript • All JavaScript code is TypeScript code, simply copy and paste • All JavaScript libraries work with TypeScript • Optional static types, classes, modules • Enable scalable application development and excellent tooling • Zero cost: Static types completely disappear at run-time • Ends with JavaScript • Compiles to idiomatic JavaScript • Runs in any browser or host, on any OS

  7. TypeScript Type System

  8. Type System • Formalization of JavaScript’s types • Static representation of JavaScript’s dynamic type system • Type inference and structural typing • In practice very few type annotations are necessary • Works with existing JavaScript libraries • Declaration files can be written and maintained separately • Not “provably type safe” • Types reflect intent but do not provide guarantees

  9. TypeScript classes and modules

  10. Classes and modules • Scalable application structuring • Classes, Modules, and Interfaces enable clear contracts between components • Aligned with emerging standards • Class, Module, and Arrow Function syntax aligns with ECMAScript 6 proposals • Supports popular module systems • CommonJS and AMD modules in any ECMAScript 3 compatible environment

  11. Application Scale TypeScript

  12. TypeScript preview • Compiler • Open Source, written in TypeScript • Tooling • Visual Studio language service, browser hosted playground • Libraries • Static typing of DOM, jQuery, node.js, WinRT, WinJS, … • And More • Lots of samples and formal Language Specification

  13. Resources • Application scale JavaScriptdevelopment is hard. • TypeScriptmakes it easier. • http://typescriptlang.org Please submit session evals on the Build Windows 8 App or at http://aka.ms/BuildSessions

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