Why I Was Wrong About Typescript TJ Vantoll

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Why I Was Wrong About TypeScript TJ VanToll TypeScript TypeScript TypeScript Why I Was Wrong About TypeScript Whether TypeScript is a good fit for your next project Why I Was Wrong About TypeScript “A typed superset of JavaScript that compiles to plain JavaScript” “A typed superset of JavaScript that compiles to plain JavaScript” !" # $ Compile to JavaScript tools • There are a lot. • 345 • Source: https://github.com/jashkenas/coffeescript/wiki/List-of- languages-that-compile-to-JS • Ruby, Python, Erlang, Java, Scala, C#, F#, Lisp, Scheme, Haskell, Smalltalk, C, C++, Basic, Go, PHP, and way more. Fun names of compile-to-JS tools • treehugger • jangaroo • Waterbear http://waterbearlang.com/ Compile to JavaScript tools • There are a lot. • 345 • Source: https://github.com/jashkenas/coffeescript/wiki/List-of- languages-that-compile-to-JS • Ruby, Python, Erlang, Java, Scala, C#, F#, Lisp, Scheme, Haskell, Smalltalk, C, C++, Basic, Go, PHP, and way more. Why I Was Wrong About TypeScript % “We risk a lot by building our core on top of TypeScript.” “I don’t hear anyone talking about TypeScript.” “I like to keep my JavaScript pure, as God intended.” Why I Was Wrong About TypeScript Why? 3 reasons 1) Commitment to the ECMAScript standard “Some examples [of compile-to-JavaScript frameworks], like Dart, portend that JavaScript has fundamental flaws and to support these scenarios requires a “clean break” from JavaScript in both syntax and runtime. We disagree with this point of view. We believe that with committee participant focus, the standards runtime can be expanded and the syntactic features necessary to support JavaScript at scale can be built upon the existing JavaScript standard.” 2) Types are opt-in 3) Tooling So should you use TypeScript? • Are your apps big? • Do you work on a team? • Unfamiliar codebases? • Non JS developers that need to write JS code? Thanks! @tjvantoll http://bit.ly/DR2017-vantoll.

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