TypeScript Best Practices for Clean, Maintainable Code

This is something I find myself coming back to time and time again in my own projects. It's practical, it works, and I think you'll find it incredibly useful.

TypeScript shines when it helps you model reality , not when it forces you to fight types all day. A few small defaults can make a codebase feel calmer, safer, and easier to refactor.

Practical rules of thumb

• Turn on strictness and fix the sharp edges early.
• Prefer readable types over clever types.
• Use unions for “one of these”, interfaces for “shape of this”.
• Avoid any as a shortcut; it becomes future debt fast.

One pattern worth memorizing

type Result<T> =
  | { ok: true; value: T }
  | { ok: false; error: string };

export function parseNumber(input: string): Result<number> {
  const n = Number(input);
  return Number.isFinite(n) ? { ok: true, value: n } : { ok: false, error: "Not a number" };
}

Wrap-up

The best TypeScript code reads like good documentation: clear names, predictable shapes, and errors that point you to the fix.

Hope this helps you on your own coding journey! Feel free to reach out if you have any questions or just want to chat about tech.