he/him 
.bind + TypeScript is a surprising escape hatch for type-safety
pic.twitter.com/rQ8sRILNND
Unclear why the original function signature can't be carried over. Feels like a technical limitation rather than a type system one. Flow has the same issue (although it handles it and related even worse).
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Back compat. Bind used to be weakly typed for technical limitation reasons, now it works as expected under the --strict flag (which opts you in to new behavior) or specifically --strictBindCallApply
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Will --strict ever be default?
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If you put it in another file and import it then it’ll magically stop working. If you use .call() then it also won’t typecheck depending on the circumstance. It’s incredibly unreliable.
End of conversation
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