Web & Frontend

j4flmao Skill

React Native New Architecture

j4flmao Skill

React Server Components (RSC)

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Use this skill when the user says 'Nuxt', 'Nuxt 3', 'Nuxt structure', 'Nuxt composables', 'Nuxt server routes', 'useFetch', 'useAsyncData', 'Nuxt layers', 'Nuxt architecture', or when building a Nuxt 3 application. This skill enforces: directory-based routing in pages/, useFetch for data fetching (preferred over useAsyncData), server routes in server/api/, auto-import from components/ and composables/, layouts with definePageMeta, and Nuxt layers for shared code across projects. Requires Nuxt 3 (nuxt.config.ts). Do NOT use for: plain Vue 3, Vite-only Vue, or React/Next.js.

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Use this skill when building Symfony backend applications — bundles, Doctrine ORM, Twig templates, Flex recipes, Messenger component. This skill enforces: service container autowiring, proper bundle structure, Doctrine mapping conventions, Flex-driven configuration. Do NOT use for: Laravel projects, WordPress plugins, pure PHP micro-frameworks.

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Expert knowledge in React Native, focusing on FlatList optimization and OTA Updates.

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Playbook for building full-stack Web3 applications (Next.js, Solidity, Kubernetes).

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Implementing Module Federation for scaling frontend teams.

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Use this skill when addressing accessibility, a11y, WCAG compliance, screen reader support, keyboard navigation, color contrast, ARIA patterns, or inclusive design. This skill enforces: WCAG 2.2 AA compliance (AAA where possible), semantic HTML structure, correct ARIA patterns, keyboard interaction design, sufficient color contrast, and screen reader testing protocol. Do NOT use for: general frontend performance optimization, visual design aesthetics, or mobile gesture-only interactions.

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Use when the user asks about motion design, animation, micro-interactions, Lottie, animation principles, UI animation, transition design, or motion guidelines. Do NOT use for: frontend animation implementation (frontend-animation), or visual design (design-visual-design).

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Use this skill when the user says 'observability', 'logging', 'metrics', 'tracing', 'OpenTelemetry', 'Grafana', 'Prometheus', 'structured logs', 'distributed tracing', 'monitoring', or when setting up observability for a service. Covers: three pillars (logs, metrics, traces), structured JSON logging, OpenTelemetry SDK setup per stack, SLO/SLI/SLA definitions, and alert design (alert on symptoms, not causes). Works with any language/stack. Do NOT use this for: infrastructure monitoring, database performance, or frontend analytics.

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Best practices for End-to-End testing with Playwright and Component testing.

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Use this skill when setting up load testing, performance testing, stress tests, k6, Locust, artillery, JMeter, or benchmarking throughput and latency. This skill enforces: scenario design (load, stress, spike, soak), metric collection (latency p50/p95/p99, throughput, error rate), distributed execution, and CI integration. Do NOT use for: frontend performance testing (Lighthouse), database query optimization, or unit-level benchmarks.

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Use when the user asks about unit testing, test doubles, mocking, stubbing, test-driven development (TDD), FIRST principles, code coverage, test structure (AAA), or unit test patterns. Do NOT use for: integration testing (quality-integration-testing), E2E testing (quality-e2e-testing), or frontend testing (frontend-testing).

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Use this skill when the user says 'Vue pattern', 'Composition API pattern', 'composable', 'provide/inject', 'Vue reactivity', 'Vue directive', 'Vue composable', 'Vue Router', 'Pinia pattern', 'renderless component', 'Vue slot pattern'. This skill enforces: composables for all reusable logic (useX naming), Pinia setup stores for global state, route lazy loading with navigation guards, renderless components with scoped slots, and custom directives for reusable DOM behavior. Requires Vue 3 (package.json with vue). Do NOT use for: Vue project structure/architecture, Nuxt-specific patterns, or non-Vue frameworks.

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Expert ECS (Entity Component System) architecture patterns - storage models, system scheduling, archetypes, cache-friendliness, and real-world engine comparisons.

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Use this skill when the user says 'Astro', 'Astro architecture', 'Astro islands', 'Astro component', 'Astro page', 'Astro content collection', 'Astro SSG', 'Astro SSR', '.astro file'. This skill enforces: zero-JS-by-default component model, island architecture with client:* directives, file-based routing, type-safe content collections with Zod schemas, and per-deployment adapter configuration. Requires Astro project (package.json with astro). Do NOT use for: Next.js, SPA-only frameworks, or projects needing full client-side hydration.

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Use this skill when the user says 'React structure', 'React architecture', 'React folder', 'React component pattern', 'React hooks architecture', 'React clean arch', 'feature-based React', 'React project layout', or when structuring a React application. This skill enforces: feature-based folder structure, smart/dumb component separation, custom hooks for all stateful logic, barrel exports only at feature boundaries, and error boundaries at route level. Requires React (package.json with react). Do NOT use for: Next.js specific patterns, Vue/Angular, or React Native.

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Use this skill when the user says 'Remix', 'Remix architecture', 'Remix routing', 'Remix loader', 'Remix action', 'Remix form', 'Remix server', 'Remix session', 'Remix deployment', 'Remix Vite'. This skill enforces: file-based colocation, nested routes with Outlet, layout routes for shared UI, loaders for data, actions for mutations, session storage strategies, and deployment per runtime. Requires Remix + Vite (package.json with @remix-run/*). Do NOT use for: Next.js, TanStack Router, or React Router alone.

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Use this skill when the user asks about frontend design patterns, component patterns, Container/Presentational, Compound Components, HOC, Render Props, Hooks patterns, Provider, or State Reducer.

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Use this skill when the user says 'XSS', 'CSP', 'CSRF', 'SRI', 'secure cookies', 'security headers', 'frontend security', 'sanitize input', 'content security policy', 'cross-site scripting', 'cross-site request forgery', or when auditing frontend security. This skill enforces: CSP headers blocking inline scripts by default, SRI on all external resources, HttpOnly/Secure/SameSite cookies, CSRF tokens on state-changing requests, and output encoding to prevent XSS. Works with any frontend framework. Do NOT use for: backend authentication, server-side SQL injection, network security.

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Use when the user asks about integration testing, component testing, API testing, database testing, test containers, wiremock, contract testing, or service-level testing. Do NOT use for: unit testing (quality-unit-testing), E2E testing (quality-e2e-testing), or contract testing (quality-contract-testing).

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Use this skill when implementing Spring Boot patterns — dependency injection, AOP, repository patterns, security configuration, testing patterns, transaction management. This skill enforces: constructor injection (no @Autowired on fields), @Transactional at service layer, AOP for cross-cutting concerns, repository abstraction with Spring Data, slice tests with TestContainers. Do NOT use for: Spring Boot project structure (see architecture skill), non-Spring Java, frontend.

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Use this skill when the user says 'API design', 'REST API', 'GraphQL schema', 'endpoint design', 'API conventions', 'URL structure', 'HTTP methods', 'response format', 'API versioning', 'pagination', or when designing new API endpoints. This skill enforces consistent REST or GraphQL conventions: plural nouns, kebab-case URLs, consistent response envelopes, versioned endpoints, paginated lists, and structured error responses. Applies to any backend stack. Do NOT use for: database schema design, frontend data fetching, or authentication implementation.

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Use this skill when the user says 'Svelte architecture', 'Svelte 5', 'Svelte runes', 'Svelte component', 'Svelte reactivity', 'Svelte store', 'Svelte compiler', '.svelte file'. This skill enforces: Svelte 5 runes ($state, $derived, $effect, $props, $bindable), .svelte file syntax, compile-time reactivity, and lifecycle tied to component tree. Requires Svelte 5 project (package.json with svelte ^5). Do NOT use for: Svelte 4 with legacy $: syntax, or non-Svelte frameworks.

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Use this skill when the user says 'animation', 'motion', 'Framer Motion', 'GSAP', 'CSS animation', 'page transition', 'enter animation', 'exit animation', 'gesture animation', 'spring animation', 'keyframe', 'motion design'. Delivers animation strategies and code for web applications. Do NOT use for: backend animation or video processing.

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Use this skill when the user says 'storybook', 'component documentation', 'visual testing', 'storybook addon', 'CSF', 'component story'. This skill enforces CSF (Component Story Format) 3.x standards, accessible stories, interaction testing, and addon integration. Applies to any frontend stack.

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Expert Entity Component System (ECS) architecture for high-performance game engines — data-oriented design, archetype storage, system scheduling, cache-coherent iteration, and production tuning.

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Best practices for SSR, Streaming, and hydration optimization in Next.js.

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Use this skill when the user says 'BFF', 'Backend for Frontend', 'API gateway', 'gateway specialization', 'frontend API', 'mobile API', 'web API', 'API composition', 'aggregation service', 'frontend gateway'. This skill designs Backend for Frontend patterns with specialized API gateways for each client type. Applies to any backend stack. Do NOT use for: general-purpose API gateways (Kong, NGINX), service mesh, or GraphQL federation.

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Use this skill when asked about testing smart contracts, Foundry tests, Hardhat tests, fuzz testing, invariant testing, property-based testing, formal verification, audit preparation, integration testing for dApps, and blockchain testing patterns. Covers Foundry cheatcodes, Echidna fuzzing, Certora verification, Hardhat network forking, mainnet simulation, gas benchmarking, and security audit workflows. Do NOT use for: general web3 frontend testing (use blockchain-web3), smart contract development (use blockchain-application), or core protocol testing (use blockchain-core).

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Use this skill when the user says 'Angular structure', 'Angular architecture', 'Angular folder', 'Angular standalone', 'Angular signals', 'Angular clean arch', 'Angular feature', 'Angular project layout', 'NgModule vs standalone', or when structuring an Angular application (v17+). This skill enforces: standalone components by default (no NgModule), feature-based folder organization with lazy loading, Signals for component state (not RxJS for local state), new control flow (@if, @for, @switch), inject() function for DI, and OnPush change detection. Requires Angular 17+ (angular.json). Do NOT use for: AngularJS, React, Vue, or pre-standalone Angular versions.

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Use this skill when the user says 'SolidJS', 'SolidJS architecture', 'Solid signal', 'Solid component', 'Solid reactivity', 'SolidJS app', 'Solid router', 'SolidJS vs React', 'SolidJS fine-grained'. This skill enforces: fine-grained reactivity via Signals/Memos/Effects, compiled JSX with no virtual DOM, declarative control flow components (Show/For/Switch), createStore for deep reactivity, and @solidjs/router for routing. Requires SolidJS project (package.json with solid-js). Do NOT use for: React, Vue, or Svelte projects.

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Use this skill when the user says 'performance', 'slow page', 'bundle size', 'lazy loading', 'code splitting', 'LCP', 'CLS', 'INP', 'web vitals', 'image optimization', 'caching strategy', or when optimizing frontend performance. This skill enforces: measure-first optimization, Core Web Vitals targets (LCP <2.5s, CLS <0.1, INP <200ms), code splitting by route, image optimization (WebP/AVIF, srcset, dimensions), and caching with stale-while-revalidate. Works with any frontend framework. Do NOT use for: backend performance, database optimization, or infrastructure tuning.

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Fundamental principles of AI Agent cognitive loops, contrasting ReAct and Plan-and-Solve paradigms.

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Use this skill when the user says 'auth', 'authentication', 'authorization', 'JWT', 'OAuth', 'RBAC', 'permissions', 'login', 'session', 'refresh token', 'guard', 'middleware auth', or when implementing or reviewing authentication and authorization. This skill enforces: JWT structure and validation, refresh token rotation, OAuth2/OIDC flows, RBAC vs ABAC decision, middleware placement, and password security. Applies to any backend stack. Do NOT use for: specific OAuth provider implementation details, frontend auth UI, or passwordless login flows.

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Use this skill when the user says 'authorization', 'access control', 'RBAC', 'ABAC', 'ReBAC', 'permissions', 'role', 'policy', 'Casbin', 'Cerbos', 'permission delegation', 'temporary access', 'break glass', 'super admin', 'JIT elevation', 'role hierarchy', or when designing or implementing authorization for any backend application. This skill covers: authorization model selection (RBAC/ABAC/ReBAC), permission architecture design, role hierarchy and inheritance, admin/master admin patterns, temporary JIT elevation, permission delegation, fine-grained ABAC policies, policy engine integration (Casbin, OPA, Cerbos, Permit.io), and authorization testing. Do NOT use for: authentication flows, JWT implementation, OAuth2/OIDC configuration, session management, or frontend route guards.