Stefan Baumgartner • 2/3/2020

TypeScript: Check for object properties and narrow down type

This article explains how TypeScript's control flow analysis works for type narrowing and addresses a limitation: checking for object properties. It provides a detailed solution using a custom `hasOwnProperty` helper function with type predicates to properly extend an object's type when a property is found, improving type safety.

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#TypeScript #type narrowing #type guards