React and TypeScript have become a favorite duo for many developers. However, combining the two without care can lead to hard-to-maintain projects. In this article, I’ll share best practices for writing clean, scalable, and readable React + TypeScript code.
1. Why Use TypeScript with React?
Catch errors early: TypeScript helps detect bugs before runtime.
Clearer code: Interfaces and types make components easier to understand.
Better maintainability: When projects grow, TypeScript helps manage props, state, and context more efficiently.
Tip: If you’re new, don’t worry. Start small, gradually type your props and state, and you’ll get the hang of it.
2. FC vs Explicit Function Type
Previously, many developers used React.FC:
Best practice now: avoid FC as it adds an unnecessary children prop. Use explicit typing:
3. Always Type Your Props & State
Never use any unless absolutely necessary.
Use generics when declaring state or refs.
4. Use enum or Union Types for Limited Values
- Union types or enums help prevent invalid values at compile time.
5. Proper Typing for Event Handlers
TypeScript provides full type coverage for DOM events.
Avoid any to catch errors during compilation rather than at runtime.
6. Avoid any Whenever Possible
Bad:
Good:
- Benefits: type-safe, better IDE autocompletion, easier to maintain.
7. Use readonly and as const Where Applicable
Prevent mutation of constants.
TypeScript will warn if you try to change them.
8. Context & Global State Best Practices
- Always type your context:
- When using Redux/RTK, always type dispatch and state to avoid refactor bugs.
9. Keep Types DRY
- Use Pick, Omit, Partial, Required to reuse types and avoid duplication.
10. Hooks Typing
Always provide explicit types for hooks.
Avoid any for refs and state.
🔑 Key Takeaways
Avoid any; always type props, state, and events.
Use union types or enums for limited values.
Avoid React.FC, use explicit function typing.
Keep types DRY to make code maintainable.
Type your hooks, context, and Redux state properly.
How do you use React + TypeScript in your projects? Any tips or tricks you follow? Comment below and share your experience!
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