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Strong types aren’t just a nice-to-have - they’re the backbone of large React apps. In this episode I go beyond basic TypeScript, showing how to keep your frontend and backend in perfect sync with advanced typing patterns, runtime validation, and automated API contracts. You’ll see how to prevent silent API breakages, ship features faster, and stop bugs before they ever reach production. If you’re serious about scaling your React app (and your team) with confidence, this guide will save you hours of debugging and sleepless nights. 00:00 - Intro 00:37 - Why types are important? 01:28 - Typescript patters for large code base 04:26 - Runtime validation 07:07 - Automation for Typescript and APIs 08:55 - Breaking changes - how to handle 11:03 - Type safety best practises