Tuning Babel to your runtimes
summary
Claim: Babel should stop being a sledgehammer and be tuned to runtimes so you only transpile what’s needed. Evidence: evergreen browsers hit ~97% Chrome and ~96% Firefox support, Node 6.8 shows ~99% support, and V8 perf is closing the gap. Tools and presets demonstrated include latest and the compatibility preset (env) to target browsers or Node, which cuts plugin count, speeds the watch cycle and often leaves features native so runtime performance improves.
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