React + TypeScript Best Practices for Production Apps in 2026

React and TypeScript have become the de facto standard for building modern web applications. But writing production-grade code requires more than just knowing the basics.

Project Structure

A well-organized project structure is crucial for maintainability:

src/

├── components/ # Reusable UI components

│ ├── ui/ # Design system primitives

│ └── features/ # Feature-specific components

├── pages/ # Route-level components

├── hooks/ # Custom React hooks

├── utils/ # Pure utility functions

├── types/ # TypeScript type definitions

├── services/ # API and external service integrations

└── stores/ # State management

Type Safety Patterns

1. Discriminated Unions for State

Instead of multiple boolean flags, use discriminated unions:

type AsyncState =

| { status: 'idle' }

| { status: 'loading' }

| { status: 'success'; data: T }

| { status: 'error'; error: Error };

2. Strict Event Handlers

Type your event handlers properly:

const handleSubmit = (e: React.FormEvent) => {

e.preventDefault();

// type-safe form handling

};

3. Generic Components

Build reusable components with generics:

interface ListProps {

items: T[];

renderItem: (item: T) => React.ReactNode;

keyExtractor: (item: T) => string;

}

Performance Optimization

Testing Strategy

Deployment & CI/CD

Set up automated pipelines that run:

The key is consistency — enforce standards through tooling, not code reviews.