Plugins

Error boundary patterns, fallback UI, reset/retry, react-error-boundary library, React 19 createRoot error hooks

TypeScript Result/Either types for type-safe error handling, railway-oriented programming patterns, error as values

Comment on page elements/text in your real browser; comments land in Claude Code with a file:line source anchor.

File upload patterns - drag-drop dropzones, chunked/resumable uploads, S3 presigned URLs, file validation (MIME type, magic bytes), progress tracking, image preview, accessibility (ARIA)

Client-side image handling - preview generation, Canvas API resizing, compression, EXIF orientation, format conversion, memory management with object URL cleanup

React Hook Form patterns - useForm, Controller, useFieldArray, validation resolver, performance optimization

TanStack Form patterns - useForm, form.Field, validators, arrays, linked fields, createFormHook, type safety

VeeValidate v4 patterns - useForm, useField, defineField, useFieldArray, schema validation with Composition API

Zod schema validation patterns for TypeScript - schema definitions, type inference, refinements, transforms, discriminated unions

Angular 17-19 standalone components, signals, control flow, dependency injection patterns

Component architecture, hooks, patterns

SolidJS fine-grained reactivity patterns - signals, effects, memos, stores, createResource, control flow components, Suspense, SolidStart

Svelte 5 Runes reactivity - $state, $derived, $effect, $props, $bindable, components, snippets, event handling, context API

Vue 3 Composition API patterns, reactivity primitives, composables, lifecycle hooks

Web development: React/Next.js best practices, web artifacts, design guidelines

Type-safe i18n for Next.js App Router

ICU message format internationalization

Type-safe i18n for Vue 3 Composition API

Leaflet interactive maps - map setup, tile layers, markers, popups, GeoJSON, custom controls, plugins, clustering, events

Mapbox GL JS interactive maps - map initialization, markers, popups, sources, layers, expressions, clustering, 3D terrain, geocoding, directions

Astro content-first framework - islands architecture, content collections, file-based routing, SSR/SSG hybrid rendering, View Transitions, server islands, multi-framework component support

Docusaurus 3.x documentation framework — site configuration, docs/blog plugins, sidebars, versioning, MDX, swizzling, and deployment

Next.js App Router patterns (15-16) - file-based routing, Server/Client Components, streaming, Suspense, metadata API, parallel routes, Server Actions, mutations, revalidation, Cache Components

Nuxt patterns - file-based routing, data fetching (useFetch/useAsyncData), useState, server routes, middleware, auto-imports, layouts, SEO

Qwik resumable framework - zero hydration, $ lazy boundaries, signals, Qwik City file-based routing, routeLoader$, routeAction$, server$ RPC, serialization rules

File-based routing, loaders, actions, defer streaming, useFetcher, error boundaries, progressive enhancement

SvelteKit full-stack framework - file-based routing, load functions, form actions, server hooks, SSR/SSG, API routes, streaming, progressive enhancement

VitePress 1.x — Vue-powered static site generator for documentation sites, built on Vite

MSW handlers, browser/server workers, test data. Use when setting up API mocking for development or testing, creating mock handlers with variants, or sharing mocks between browser and Node environments.

Bundle optimization, render performance, Core Web Vitals