Redux Toolkit patterns for complex client state. Use when managing enterprise-scale state, needing DevTools, entity normalization, or RTK Query for data fetching.
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Design token architecture - primitive/semantic/component tiers, naming grammar, CSS custom property delivery, and DTCG build pipelines
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Unstyled accessible React component primitives
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Native WebSocket API patterns, connection lifecycle, reconnection strategies, heartbeat, message typing, binary data, custom hooks
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date-fns patterns for TypeScript - formatting, parsing, manipulation, comparison, timezone handling, and internationalization
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Class Variance Authority - type-safe component variant styling with cva(), compound variants, and VariantProps
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SCSS Modules - locally scoped component stylesheets, cascade layers, the Sass module system, mixins, and build-time versus runtime values
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Ant Design enterprise UI library for React
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Unstyled accessible UI primitives
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Reactive programming with RxJS - Observables, operators, Subjects, error handling, and memory leak prevention
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Zustand stores, client state patterns. Use when deciding between Zustand vs useState, managing global state, or avoiding Context misuse.
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Pinia stores, Vue 3 state patterns. Use when managing client state in Vue applications, choosing between Options/Setup stores, composing stores, or implementing persistence.
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Type-safe client-side routing for React with file-based routes, search params validation, loaders, and code splitting
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React Query server state — query keys and query options, caching policy, error handling, and typed clients generated from an API schema
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Client-side routing with data APIs — loaders, actions, error boundaries, search params, nested layouts, and code splitting
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NgRx SignalStore patterns for Angular state management. Use when managing client state with Angular Signals, composing store features, handling entities, or integrating RxJS effects.
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Runtime theming - applying a theme system to a live app without flash
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Playwright E2E testing patterns - test structure, Page Object Model, locator strategies, assertions, network mocking, visual regression, parallel execution, fixtures, and configuration
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Atomic state management with auto-dependency tracking
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Accessible React component library with style props and theming
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TanStack Table v8 patterns - useReactTable, column definitions, sorting, filtering, pagination, row selection, virtual scrolling, server-side data
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Modern native JavaScript (ES2022-ES2025) utility patterns that replace lodash
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MobX observable state management patterns with mobx-react-lite. Use when implementing reactive client state with observables, computed values, actions, and the observer HOC.
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Tailwind CSS v4 - utility-first CSS framework with CSS-first configuration
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