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Frameworks & web · #react
Vite’s Hot Module Replacement uses native ES modules to update only changed parts of an app, preserving state with React Fast Refresh. See a concrete example, how to use <code>import.meta.hot</code>, and common pitfalls.
Remix route actions let you handle form mutations without building API routes or hand-rolling loading state — here's a worked useFetcher example, plus the real limits: server-only deployment, no streaming, and coarse revalidation.
Learn how Jest snapshot testing captures component output to detect unintended UI changes, with a concrete Button example, setup steps, and practical limitations.
Carbon v11 themes are CSS custom properties under the hood. Use the supported Theme component for light/dark switching, override --cds-* tokens sparingly for branding, and verify in DevTools.
Webpack 5 Module Federation lets microfrontends share React components at runtime instead of bundling duplicates. A minimal host/remote example, verification steps, and the real trade-offs.
Decide when to use React's useState or useReducer for local component state. A concise decision matrix, trade-offs, and a concrete reducer pattern guide.
Stop manually managing useMemo dependencies. Learn how MobX computed values provide automatic caching and lazy evaluation to keep your React UI performant and your state logic declarative.
MUI v6's CSS-variable theming (cssVariables + colorSchemes) and InitColorSchemeScript eliminate the SSR theme flash and move token resolution out of React render cycles. Here's how to adopt it, where the sx prop still costs you, and how to verify the gains in your own build.
Learn how Zustand's shallow equality helper stops wasteful re-renders, when to use custom equality functions, and how to verify the impact with React DevTools.
vitejs
remix
jest
webpack
mobx
zustand