he/him 
Prepack, a partial JavaScript evaluator and optimising compiler we've developed at FB, has just been open sourced! https://prepack.io/
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If you can wedge it in, it'd be amazing for the ecosystem, adoption basically becomes a no-brainer
It's more akin to Webpack than Babel. It operates on a whole bundle of JavaScript rather than individual files.
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Ah, so it's like TypeScript, it has to understand your whole program
Thanks. Twitter will use this to make your timeline better. UndoUndo
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