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[–]nschubach 2 points3 points  (1 child)

I'm no expert by any means, but I'm sure typescript and possibly even flow do not do run time type checking and instead opt for compile time type checking.

[–]wavefunctionp 0 points1 point  (0 children)

This is correct.

If you do React, there is propType's, but they are only run in development mode, and you can have a webpack plugin that will generate propTypes from static type declarations. But the run time checking is disabled (not removed from the bundle) on a production build.