he/him 
No JS tool (that I know of) will warn you about these conditions being impossible. But they should. const foo = 'FOO'; if (foo[0] === 'B') {} // impossible if (foo === 'BAR') {} // impossible
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I need to be faster with my screenshots :(pic.twitter.com/krlTO0II4U
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For what it's worth,
@WesleyWigham prototyped something that would've made the middle one work (indexing into something with a string literal type). He's also the one with the branch for regex literal types. :D
End of conversation
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