Facebook Launches Flow, Static Type Checker for JavaScript

Re:Facebook Launches Flow, Static Type Checker for JavaScript by hyp0 on Tuesday November 18, 2014 @11:09PM (#8628203)

Static types without performance benefits. So far, all popular static type systems have had the performance benefits, so it's unclear how much people value the other benefits (quality and documentation).

I wonder which will have the most impact: code quality or types as documentation (esp for tooling)?

They are adapting to common idioms, rather than designing it from the ground up. This ad hoc approach is a great way to build useful tools (and startups), but it's also usually a mess. Like NN4. But, they seem to be type experts - plus they're using ocaml. Maybe ad hoc by experts is the way to get these ideas adopted?

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Re:Facebook Launches Flow, Static Type Checker for JavaScript by avik on Wednesday November 19, 2014 @06:20PM (#8633357)

If you can feed inferred static types to something like Google Closure Compiler, you do get performance benefits.

Also, if you're code is implicitly statically typed (as checked by Flow) you will likely hit all the right optimizations in the underlying JavaScript VM.

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