5 Common TypeScript Mistakes in React (And How to Fix Them)

5 Common TypeScript Mistakes in React (And How to Fix Them) TypeScript has become the de facto standard for React development, and for good reason: it catches bugs at compile time, improves IDE support, and makes refactoring less terrifying. But here's the thing—adopting TypeScript doesn't automatically mean you're writing type-safe code. After reviewing dozens of React codebases, I've noticed the same TypeScript mistakes popping up over and over. These aren't obscure edge cases; they're patterns that undermine the very benefits TypeScript promises to deliver. Let's walk through the five most common mistakes and, more importantly, how to fix them. Mistake #1: Overusing any (The Type Safety Killer) The any type is TypeScript's "I give up" button. It turns off type checking entirely, effectively creating a hole in your type system. The Problem // ❌ Bad: any defeats the purpose of TypeScript const fetchUserData = async ( id : string ): Promise < any > => { const response = await fetch ( `