1. 9/13/2018 7:43 AM
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2. What’s new in TypeScript
9/13/2018 7:43 AM
B8088
What’s new in TypeScript
Anders Hejlsberg
Technical Fellow
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3. TypeScript: JavaScript that scales.
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TypeScript: JavaScript that scales.
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4. Microsoft Build 2017
9/13/2018 7:43 AM
A statically typed superset of JavaScript that compiles to plain JavaScript.
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5. Any browser. Any host. Any OS.
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9/13/2018 7:43 AM
Any browser. Any host. Any OS.
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6. Open Source. Microsoft Build 2017 9/13/2018 7:43 AM
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7. Great tools enabled by static types Features from the future, today!
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Great tools enabled by static types
Features from the future, today!
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8. JavaScript feature gap
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9/13/2018 7:43 AM
The feature gap
JavaScript Evolution
ES3
ES5
ES2016
ES2017
ES2018
ES2015
State of web JS
State of server JS
State of the art JS
JavaScript feature gap
Target
Productivity
May 2015
May 2017
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9. Demo Microsoft Build 2017 9/13/2018 7:43 AM
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10. Eight months, four releases
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9/13/2018 7:43 AM
Eight months, four releases
2.3
2.2
2.1
Type check .js files Plug-in support
2.0
Mixin classes Quick fixes
Downlevel async/await Mapped types
Non-nullable types Discriminated unions
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11. New features Non-nullable types Control flow analysis
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9/13/2018 7:43 AM
New features
Non-nullable types
Control flow analysis
Discriminated union types
Literal types
Definition files as NPM packages
Downlevel async/await
Generator support for ES3/ES5
Asynchronous iterators
Type parameter defaults
Object spread and rest
Mixin classes
Mapped types
Lookup types and ‘keyof’ type operator
Type checking for plain JavaScript
Infer types from JSDoc in JavaScript files
Language service extensibility
Configuration inheritance
Transformation based emitter
Quick fixes
Untyped imports
New ‘object’ type
Explicitly typed ‘this’ in functions
Readonly properties and index signatures
Path mappings in module resolution
Glob support in tsconfig.json
UMD module definitions
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12. Demo Microsoft Build 2017 9/13/2018 7:43 AM
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13. Type system Gradual, Structural, Generic Extensive type inference
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9/13/2018 7:43 AM
Type system
Gradual, Structural, Generic
Extensive type inference
Control flow based type analysis
Union, intersection, and tuple types
Index, lookup, and mapped types
Object-oriented and functional
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14. TypeScript tools Visual Studio Sublime Text Atom WebStorm
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9/13/2018 7:43 AM
TypeScript tools
Visual Studio
Sublime Text
Atom
WebStorm
Visual Studio Code
Eclipse
Emacs
Vim
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15. TypeScript server Editor tsserver (Node.js) JSON TypeScript plug-in
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9/13/2018 7:43 AM
TypeScript server
Editor
tsserver (Node.js)
JSON
TypeScript plug-in
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16. TypeScript adoption Microsoft Build 2017 9/13/2018 7:43 AM
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17. Microsoft Build 2017
9/13/2018 7:43 AM
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18. Microsoft Build 2017
9/13/2018 7:43 AM
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19. Microsoft Build 2017
9/13/2018 7:43 AM
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20. Microsoft Build 2017
9/13/2018 7:43 AM
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21. TypeScript and frameworks
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9/13/2018 7:43 AM
TypeScript and frameworks
“With TypeScript, several of our team members have said things like “I now actually understand most of our own code!” because they can easily traverse it and understand relationships much better.”
-- Brad Green, Engineering Director at Google
“One of Ionic's main goals is to make app development as quick and easy as possible, and the tooling support TypeScript gives us with autocompletion, type checking and source documentation really aligns with that.”
-- Tim Lancina, Tooling Developer at Ionic
“TypeScript helped us to reuse the team’s knowledge and to keep the same team velocity by providing the same excellent developer experience as C# ... A huge improvement over plain JavaScript.”
-- Valio Stoychev, PM Lead NativeScript
“By combining Aurelia with TypeScript for modern web, mobile and desktop development, we've seen what is perhaps the most beautiful and elegant app development workflow to date.”
-- Rob Eisenberg, Architect - Aurelia
“TypeScript has helped ensure that Dojo 2 will be built on rock solid foundations, which will make enterprise development better. TS gives us all the benefits of ES6, plus more productivity, … and responsive support from the TypeScript team ”
-- Dylan Schiemann, Co-founder - Dojo Toolkit, CEO - SitePen
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22. http://typescriptlang.org Microsoft Build 2017 9/13/2018 7:43 AM
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23. 9/13/2018 7:43 AM
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