he/him 
Unpopular opinion: @reactjs edition
Bring it on 
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Stuff like invariant isn’t important. We actually wanted to cut that out. There’s some legit constraints (the way data flow is structured), some intentional culture (longer names, relatively large procedural functions), and some accidental stuff which can go (like invariant).
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it was used plenty before flow too (:
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At least then the motivations would have been better, right? Setting expectations and asserting impossible conditions rather than purely type system satisfaction? I find I dislike using invariants/assertions because I’m burnt out by refinements.
End of conversation
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It’s almost always a bad shortcut.
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