2. Build 2014 Anders Hejlsberg Technical Fellow
5/1/2019
3-576
TypeScript
Anders Hejlsberg
Technical Fellow
© 2014 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

3. Large scale JavaScript development is hard.

4. TypeScript: A language for large scale JavaScript development.

5. TypeScript: A typed superset of JavaScript that compiles to plain JavaScript.

6. Any browser. Any host. Any OS.

7. Open Source.

8. + +

9. + +

10. Announcing: TypeScript 1.0

11. Type System Structural typing and type inference Generics
An accurate static representation of JavaScript’s dynamic run-time type system
Structural typing and type inference
In practice very few type annotations are necessary
Generics
Increases accuracy and expressiveness of type system
Works with existing JavaScript libraries
Declaration files can be written and maintained separately
Types enable tooling
Provide verification and assistance, but not hard guarantees

12. Classes, Interfaces, Modules
An accurate static representation of JavaScript’s dynamic run-time type system
Scalable application structuring
Classes, interfaces, and modules enable clear contracts in code
Aligned with emerging standards
Class and lambda syntax aligns with ECMAScript 6 proposals
Supports popular module systems
CommonJS and AMD modules in any ECMAScript 3 environment

13. TypeScript Ecosystem Community Frameworks Tool support
An Open Source language for large scale JavaScript development.
Community
Over 4000 CodePlex posts, 170 forks, 500 feature requests, 2000 StackOverflow questions
Now taking pull requests
Frameworks
Over 350 .d.ts library definitions on Definitely Typed repository covering more than 90% of popular JavaScript frameworks
Tool support
IDEs: VS, Monaco, Eclipse, IntelliJ, Resharper, Sublime Text, Brackets, …
Build: Heroku, Ruby, grunt, ASP.NET, node.js, compile-in-client
Testing: Chutzpah, tsUnit

14. TypeScript Roadmap TypeScript 1.0 available now! ECMAScript 6
An Open Source language for large scale JavaScript development.
TypeScript 1.0 available now!
In box for Visual Studio 2013, plug-in for Visual Studio 2012, node.js package, source on CodePlex
ECMAScript 6
Ratification targeted for December 2014
Classes, Arrows, Modules, Destructuring, let + const, for…of, Generators, Comprehensions, …
TypeScript 2.0 wish list
ECMAScript 6 parity, downlevel support where feasible
Additional features, e.g. Asynchronous Functions (async/await)

16. Your Feedback is Important
Build 2014
5/1/2019
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© 2014 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

17. © 2014 Microsoft Corporation. All rights reserved
© 2014 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.