Migrating to TypeScript: a practical guide

TypeScript is more than types — it improves DX, reduces runtime bugs, and makes scaling easier.

Why migrate (for existing JS projects)

• Fewer runtime errors
• Safer refactors with better tooling
• Clearer contracts between modules

The incremental strategy that works

1. Enable TypeScript gradually
2. Type the edges first: API, data layer, models
3. Prefer unknown over any
4. Iterate — avoid a big-bang rewrite

Quick checklist

• Start with lighter strictness, increase over time
• ESLint + TS config
• Shared DTO types
• Tests for critical flows

Conclusion

TypeScript migration is a process, not a one-time event. Done right, it pays off quickly.