The article delves into the concept of type safety in TypeScript, emphasizing its role in ensuring program correctness beyond mere elimination of type errors. It explores the use of algebraic data types, particularly the Either type, to handle different cases in programming, minimizing bugs by addressing incorrectly or unhandled cases. The text highlights several pattern matching libraries, such as TS-Pattern, Unionize, and Pratica, which enhance TypeScript's capabilities in creating more expressive and type-safe code. Additionally, the article introduces the io-ts library for runtime types, which bridges the gap between static typing and dynamic data validation, offering an alternative approach to defining and handling types in TypeScript. Through various examples, the discussion illustrates how these tools and techniques can be integrated into everyday coding tasks to improve code reliability and maintainability.