Over the past few weeks, I’ve been translating a JavaScript project I previously built into TypeScript. While I’m still in the middle of it, I wanted to pause and share some of my thoughts, challenges, and small wins so far.
Why I started the migration:
Mainly for type safety, better developer experience, and more predictable code. TypeScript can seem overwhelming at first, but I’ve found that taking it step by step makes the process much more manageable.
What’s been interesting so far:
- Discovering how much type information I used to assume in JS
- Creating types for API responses and Express req/res objects
- Dealing with TypeScript errors that actually improved my logic
- Learning how to extend global types (like adding req.user)
What I’m still figuring out:
- What's the cleanest way to handle shared types across services and controllers
- How to write DRY, reusable utility types
- Structuring the project so types don’t get out of hand
This is my first TypeScript rewrite of an existing project, so I know I still have a lot to learn — but I’m enjoying the process.
🔁 Have you migrated a JavaScript project to TypeScript before?
I’d love to hear your experience.
What helped you the most?
What caught you off guard?
Let’s learn together 🚀