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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will this really perform better with e.g. V8 Ignition and TurboFan pipeline?
Maybe. It removes code that's executed on startup. No matter how optimised that code is removing it will always be faster.
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Note that Prepack is only applicable (at the moment) to code on the init path. This is more akin to a minifier that removes dead code.
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