typescript-strictlisted

# TypeScript strictness Keep strict mode valuable by treating escapes as design decisions. ## Unknown data Use `unknown` for untrusted values, then narrow with control flow, discriminants, predicates, or a schema validator. Validate external input at the boundary before it enters domain code. ## Avoid unsafe escapes Avoid `any`, unsafe casts, and non-null assertions. If a value can be absent, model that possibility and handle it. Prefer checks that prove the value exists over assertions that silence the compiler. ## Optional semantics When exact optional behavior matters, distinguish an omitted property from a property whose value is `undefined`. Do not use optional fields as a substitute for a clear variant model.