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Convince me I am wrong: This should not be a type error, right? - I asserted it’s an object - I am using `?.` for property access www.typescriptlang.org/play/#code/G...

Object check in TS is a PITA. I started parsing them at the edge of the program (app code). This is probably different for lib code. IDK if you're searching for a solution; if so, this is the approach I was using before: www.typescriptlang.org/play/#code/G...

This, except I tend to use use hasOwnProperty rather than in. Feels like I usually care about immediate properties in type guards, not inherited ones.

Why is this important? How often do you find malicious prototype chains in your own code?