Why I Use TypeScript for Everything

Real talk - I resisted TypeScript for a while. The setup felt like overhead, the type annotations felt like busy work, and I figured I was fast enough with plain JavaScript. Then I worked on a React Native project where bugs kept popping up in production. A function expected a number but got a string. An object was missing a required field. An API response didn't match what the code assumed. Every single one of those bugs would've been caught by TypeScript before the code even ran.

The moment it really clicked for me was during a big refactor. I needed to rename a property that was used across like 40 files. In JavaScript, that's a scary find-and-replace where you just hope you didn't miss anything. In TypeScript, I changed the type definition and boom - the compiler lit up every single file that needed updating. Zero missed references. Zero runtime surprises. That one experience probably saved me hours and I was sold.

People say TypeScript slows you down. I'd argue the opposite. Yeah, you type a few extra characters for annotations. But your IDE gives you autocomplete for everything - every function, every prop, every API response field. You can hover over any variable and instantly see what it is. That alone makes development way faster than guessing and console.logging.

It also makes your code way easier to read. When you see a function like processOrder(order: Order, userId: string): Promise<OrderResult>, you instantly know what it takes and what it gives back. No need to dig through the implementation or hunt for docs. For solo devs like me, this is huge when I come back to a project after a few months and think "what does this do again?"

The ecosystem has caught up too. Most libraries ship their own types now, and tools like Zod let you define validation schemas that automatically generate TypeScript types. TanStack Query, Prisma, tRPC - they all use TypeScript to give you type safety all the way from your database to your UI. It's really nice when it all connects.

If you're thinking about trying it, my advice: don't migrate an existing project. Start fresh with something new and turn on strict mode from the start. Don't reach for "any" when things get hard - that usually means you need to think about your data shape more carefully. Give it two weeks. The first week might feel slower, but by week two you'll wonder how you ever lived without it.

Is TypeScript perfect? Nah. The build step is extra work. Complex generics can make your eyes glaze over. Some JavaScript patterns are just awkward to type. But for anything you're going to maintain for more than a couple weeks, it's absolutely worth it. It's not a luxury - it's genuinely a productivity boost.