TypeScript : Application scale JavaScript
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Transcript of TypeScript : Application scale JavaScript
TypeScript: Application scale JavaScript
Anders HejlsbergTechnical Fellow3-314
Application scale JavaScriptdevelopment is hard.
TypeScript: A language for application scale JavaScript development.
TypeScript: A typed superset of JavaScript that compiles to plain JavaScript.
Any browser. Any host. Any OS.
Open Source.
Starts with JavaScriptAll JavaScript code is TypeScript code, simply copy and pasteAll JavaScript libraries work with TypeScript
Optional Static Types, Classes, ModulesEnable scalable application development and excellent toolingZero cost: Static types completely disappear at run-time
Ends with JavaScriptCompiles to idiomatic JavaScriptRuns in any browser or host, on any OS
An Open Source language for application scale JavaScript development.
TypeScript
Demo: TypeScript in Action
Type inference and structural typingIn practice very few type annotations are necessary
GenericsEnables more accurate expression of flow of types
Works with existing JavaScript librariesDeclaration files can be written and maintained separately
Types enable toolingProvide verification and assistance, but not hard guarantees
TypeScript’s static compile-time type system accurately models the dynamic run-time type system of JavaScript
Type System
Scalable application structuringClasses, Modules, Interfaces enable clear contracts between components
Aligned with emerging standardsClass, Module, Lambda syntax aligns with ECMAScript 6 proposals
Supports popular module systemsCommonJS and AMD modules in any ECMAScript 3 environment
TypeScript’s static compile-time type system accurately models the dynamic run-time type system of JavaScript
Classes and Modules
LanguageGeneric classes, interfaces, and methodsOverloading on constantsEnum types‘export =‘Function/class/module mergingMethods in object literals
CompilerIncremental parserPull-model type checkerScaling to 100K+ line projects
This release represents the largest update to TypeScript to date, bringing significant changes to the language, compiler and tools.
TypeScript 0.9
TypeScript Adoption
Xbox Music and TypeScript
FrameworksDefinitely Typed has 150+ community curated library typingsOver 90% of top 20 JavaScript frameworks covered
ToolsRich IDEs: Visual Studio, WebStorm, Cloud9, BracketsText Editors: SublimeText, vi, Emacs, JSBinBuild Integration: ASP.NET, node.js, compile-in-client, Ruby, grunt
ProcessActive Open Source development on CodePlexThousands of discussion posts and tracked issues
“TypeScript is quite a good piece of work for Visual Studio users, and smartly aligned with ES6.”
- Brendan Eich
TypeScript Ecosystem
http://typescriptlang.org
ResourcesUse this slide to list resources, white papers, videos and links.
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