TYPESCRIPT-BASICS5 MIN READ
Walk unknown to a domain type
Build a safe path from `unknown` input to a narrowed TypeScript domain type.
decision trail trust boundary callout score chips The boundary Partner webhook payloads are useful but not trustworthy. The CRM handoff needs a real Lead, not a hopeful cast. The bug already cost 126 records. Evidence-based narrowing unknown → guard → domain The compiler should trust the domain type only after runtime checks have earned it. Cast Fast but unverified The CRM only sees verified leads. Trust follows evidence. 01 Entry 02 Guard 03
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