React and TypeScript Architecture Patterns That Hold in 2026

Architecture As Important As Framework Selection

The Feature-Based Structure That Works

Colocate types with components and keep props narrow. Wide prop bags become the debt that TypeScript was meant to prevent.

src/
  features/
    auth/
      components/
      hooks/
      api/
      types.ts
    dashboard/
      components/
      hooks/
      api/
      types.ts
  shared/
    components/
    hooks/
    lib/
  app/
    layout.tsx
    page.tsx

You Type the Components Like You Mean It

For You Type the Components Like You Mean It, define the inputs, the owner of the step, and the exit criteria before changing code. Operators should be able to re-run the step from a known checkpoint without guessing hidden state. Keep configuration outside application code. Environment files, secret stores, and feature flags belong in one place operators can audit without reading the whole graph. Colocate types with components and keep props narrow. Wide prop bags become the debt that TypeScript was meant to prevent. For You Type the Components Like You Mean It, define the inputs, the owner of the step, and the exit criteria before changing code. Operators should be able to re-run the step from a known checkpoint without guessing hidden state. Prefer small, testable units over sprawling scripts. When a step fails, the failure should point at a single responsibility rather than a tangled pipeline.

// features/auth/types.ts
export interface LoginFormProps {
  onSubmit: (email: string, password: string) => void;
  isLoading?: boolean;
}

// features/auth/components/LoginForm.tsx
export function LoginForm({ onSubmit, isLoading = false }: LoginFormProps) {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    onSubmit(email, password);
  };

  return (
    <form onSubmit={handleSubmit} className="flex flex-col gap-4">
      {/* inputs go here */}
    </form>
  );
}

State Management: Don’t Over-Engineer

For State Management: Don’t Over-Engineer, define the inputs, the owner of the step, and the exit criteria before changing code. Operators should be able to re-run the step from a known checkpoint without guessing hidden state. Treat this stage as a contract between inputs and validated outputs. Name the artifacts, define success checks, and refuse silent partial completion. Migrate module by module with strictness flags that fail CI on new any usage.

Quick Takeaways

Migrate module by module with strictness flags that fail CI on new any usage.

Operational checklist

Migrate module by module with strictness flags that fail CI on new any usage.

Prefer boring reliability over clever one-off demos.

Migrate module by module with strictness flags that fail CI on new any usage.

For hardening note 0, define the inputs, the owner of the step, and the exit criteria before changing code. Operators should be able to re-run the step from a known checkpoint without guessing hidden state.

Record timings and cost next to functional results. Visibility early prevents surprise bills when the path moves from demo to shared environments.

Colocate types with components and keep props narrow. Wide prop bags become the debt that TypeScript was meant to prevent.

For hardening note 1, define the inputs, the owner of the step, and the exit criteria before changing code. Operators should be able to re-run the step from a known checkpoint without guessing hidden state.

Document the happy path and the recovery path together. Retries, human gates, and dead-letter handling are part of the product, not later polish.

Migrate module by module with strictness flags that fail CI on new any usage.