Recently, TypeScript's share in the JS ecosystem has been growing rapidly. Does combining a dynamic language like JS with type safety make projects more robust, or does it add overhead with type inference and in simple projects? How far have you come without a type system? Did you decide to switch to TS as your projects grew, or did you stick with JS in every case? Share your experiences!
Should TypeScript be mandatory in JS projects?
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So what about situations where TypeScript might clash with the need for long-term maintenance and scalability in projects? When we built a simple dashboard with a small team over six months, we found the type system’s overhead unnecessary and stuck with plain JS. But two years later, when a 10-person team took over the same project, we saw just how painful refactoring non-typed code could be—almost every function and state had to be retyped from scratch. That’s when we realized just how much time type safety saves in constantly changing teams and long-lived projects.
After the refactor, we saw firsthand how the type system—especially generics and utility types—made dynamic JavaScript projects far more robust. But the key takeaway is that the value of the type system scales with the project’s complexity. In small, one-off, or quick prototype scenarios, the extra typing overhead might not hurt performance, but it can slow down development—this is where JS’s flexibility shines. Ultimately, the decision to switch to TypeScript should depend on the project’s needs and the team’s maturity level.