Blog

Stop casting with `as` and `!`. Discriminated unions give TypeScript enough information to narrow types automatically — making impossible states unrepresentable and exhaustiveness checking free.

TypeScript ships with 15+ utility types that let you derive new types from existing ones. Here's the full toolkit with the production patterns you'll actually reach for.

Conditional types and mapped types let you write types that compute — filtering keys, extracting nested types, and deriving new shapes from old ones without duplication.

Stop writing the same function for every type or reaching for `any`. TypeScript generics let you write it once — with full type inference, constraints, and zero casting.

When useState leaves you with six interdependent state variables, useReducer gives you one coherent state machine — plus a reducer you can test without mounting a component.

Learn how React.lazy, Suspense boundaries, and React 19 concurrent features (useTransition, useDeferredValue) eliminate bundle bloat and loading jank.

Stop making users wait for server round-trips. Learn how to use React's useOptimistic hook and TanStack Query to update your UI instantly and roll back gracefully on failure.

overflow:hidden and CSS stacking contexts trap your modals and tooltips. React's createPortal escapes both while keeping the React tree — and context — intact.

Custom hooks replaced render props for most cases — but not all. Learn the four scenarios where the old pattern still wins, with TypeScript examples.