fm-skills

Explains design system patterns including design tokens, component layers, API design, accessibility defaults, theming, documentation, and governance. Use when structuring a reusable component system, defining tokens and variants, or deciding how teams should build and evolve shared UI.

Explains browser storage patterns including cookies, localStorage, sessionStorage, and when to use each. Use when deciding how to persist client-side data, handle auth/session concerns, or choose safe storage patterns for preferences, drafts, and browser state.

Explains error handling patterns in web applications including error boundaries, retries, recovery UX, normalized error shapes, graceful degradation, and observability hooks. Use when designing how applications should fail, recover, and communicate problems to users.

Explains observability patterns for web applications including logs, metrics, traces, client error reporting, correlation IDs, SLOs, and alert design. Use when debugging production issues, designing telemetry, or deciding what signals to collect from frontend and backend systems.

Explains web performance patterns including Core Web Vitals, network and JavaScript cost, rendering and hydration work, lazy loading, caching, and performance budgets. Use when diagnosing slow pages, improving user-perceived speed, or deciding which optimization strategy matters most.

Explains testing strategy for modern web applications including unit, integration, component, end-to-end, contract, accessibility, visual, and performance testing. Use when deciding what to test at each layer, choosing modern testing tools, designing CI quality gates, or improving confidence without creating a slow and brittle test suite.

[TODO: Complete and informative explanation of what the skill does and when to use it. Include WHEN to use this skill - specific scenarios, file types, or tasks that trigger it.]

Explains accessible interaction patterns in web applications including keyboard navigation, focus management, semantic controls, form feedback, announcements, and motion preferences. Use when building interactive UI that must work well for keyboard, screen reader, and assistive technology users.

Explains cache invalidation strategies in web applications including cache keys, freshness windows, mutation-driven invalidation, revalidation, and eviction tradeoffs. Use when designing server-state caching, deciding when data is stale, or fixing bugs caused by stale or inconsistent cached data.

Explains optimistic UI updates, mutation lifecycles, rollback strategies, temporary IDs, and reconciliation patterns. Use when implementing fast-feeling mutations, pending states, undo flows, or conflict handling for user actions before the server responds.

Explains middleware concepts, patterns, and implementations. Covers server middleware, edge middleware, request/response pipelines, and common use cases like auth, logging, and CORS. Use when implementing middleware or understanding request processing pipelines.

Explains JavaScript bundling, code splitting, chunking strategies, tree shaking, and build pipelines. Use when optimizing bundle size, understanding how modern build tools work, configuring Webpack/Vite/esbuild, or debugging build output.

Explains data fetching strategies including fetch on render, fetch then render, render as you fetch, and server-side data fetching. Use when implementing data loading, optimizing loading performance, or choosing between client and server data fetching.

Explains hydration, partial hydration, progressive hydration, and islands architecture. Use when discussing how server-rendered HTML becomes interactive, optimizing JavaScript loading, or choosing between full hydration and islands architecture.

Explains meta-frameworks like Next.js, Nuxt, SvelteKit, Remix, Astro, and their architectural patterns. Use when comparing frameworks, choosing a framework for a project, or understanding what features meta-frameworks provide beyond base UI libraries.

Explains web rendering strategies including Client-Side Rendering (CSR), Server-Side Rendering (SSR), Static Site Generation (SSG), Incremental Static Regeneration (ISR), and streaming. Use when deciding rendering strategy, optimizing performance, or understanding when content is generated and sent to users.

Explains client-side routing, server-side routing, file-based routing, and navigation patterns in web applications. Use when implementing routing, understanding how navigation works in SPAs vs MPAs, or configuring routes in meta-frameworks.

Explains SEO for web applications including crawling, indexing, Core Web Vitals, structured data, and SEO challenges with SPAs. Use when optimizing for search engines, discussing SEO implications of architecture decisions, or implementing SEO best practices.

Explains state management in web applications including client state, server state, URL state, and caching strategies. Use when discussing where to store state, choosing between local and global state, or implementing data fetching patterns.

Explains universal JavaScript deployment, the UnJS ecosystem (Nitro, H3, unenv), WinterCG web standards, and cross-platform runtimes. Use when building apps that deploy anywhere, understanding server adapters, or working with edge functions and serverless platforms.

Explains Single Page Applications (SPA), Multi Page Applications (MPA), and hybrid architectures. Use when discussing app architecture decisions, comparing SPA vs MPA, explaining how traditional vs modern web apps work, or when building a new web application.