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And has some really odd behaviors like https://github.com/microsoft/TypeScript/issues/17053

Are you saying typescript should parse regular expressions?

Turn on `noUncheckedIndexAccess` and it works as you expect (plus forces you to check all the places you're doing unchecked access).

https://www.typescriptlang.org/play/?noUncheckedIndexedAcces...

Regular expressions are part of the language, so it's not so unreasonable that TypeScript should parse them and take their semantics into account. Indeed, TypeScript 5.5 will include new support for syntax checking of regular expressions[1], and presumably they'll eventually be able to solve the problem the GP highlighted on top of those foundations.

[1]: https://github.com/microsoft/TypeScript/pull/55600

That's crazy, in the best way

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