practices▌

Comprehensive guidance for building modern ecommerce storefronts with patterns, component architecture, and backend integration. \n \n Covers all storefront components: navigation, product pages, cart, checkout, and account pages across any framework (Next.js, SvelteKit, React, Vue) \n Includes critical accessibility patterns (aria-live for cart updates), mobile optimization (safe-area-inset, 44px touch targets), and SEO requirements (Product schema, Core Web Vitals) \n Provides mandatory backen

Language and framework-specific security reviews with actionable vulnerability detection and fix guidance. \n \n Supports Python, JavaScript/TypeScript, and Go with framework-specific best practices loaded from a references directory \n Operates in three modes: secure-by-default code generation, passive vulnerability detection during development, and full security audit reports with severity prioritization \n Generates detailed markdown reports with line-number references, impact statements, and

Comprehensive guidance for building Fastify Node.js backends with TypeScript, covering routes, plugins, validation, and production deployment. \n \n Covers 16+ core topics including plugins, route organization, JSON Schema validation, error handling, hooks, authentication, testing, logging with Pino, and TypeScript integration via strip types \n Includes recommended reading paths for common scenarios: new projects, adding authentication, performance optimization, testing setup, and production de

Comprehensive Vue.js testing guidance covering unit, component, and end-to-end testing strategies. \n \n Addresses 11 common testing challenges including async handling, composable testing, Pinia store setup, Suspense components, and Teleport queries \n Recommends Vitest for unit and component testing infrastructure, with Playwright as the preferred E2E framework \n Covers black-box component testing patterns to reduce brittleness during refactoring, async/await synchronization, and snapshot tes

45 performance optimization rules for React and Next.js, organized by impact and category. \n \n Covers 8 rule categories from eliminating waterfalls and bundle optimization (critical) through JavaScript performance and advanced patterns (low priority) \n Each rule includes explanation, before/after code examples, and context to guide automated refactoring and code generation \n Prioritized by impact: waterfalls and bundle size are critical; server-side performance and re-render optimization are

Comprehensive Vue.js testing guidance covering unit, component, and end-to-end testing strategies. \n \n Addresses 11 common testing challenges including async handling, composable testing, Pinia store setup, Suspense components, and Teleport queries \n Recommends Vitest for unit and component testing infrastructure, with Playwright as the preferred E2E framework \n Covers black-box component testing patterns to prevent brittle tests during refactoring, async/await patterns to eliminate race con

Node.js architecture and framework selection guidance based on deployment context and project requirements. \n \n Framework decision tree covers Hono (edge/serverless), Fastify (performance), NestJS (enterprise), and Express (legacy), with selection criteria tied to cold start time, ecosystem size, and team experience \n Covers layered architecture principles (controller, service, repository), async patterns (async/await vs Promise.all/allSettled), and centralized error handling with appropriate

Vue Pinia state management patterns, common reactivity pitfalls, and store setup best practices. \n \n Covers three core areas: store initialization, reactivity patterns, and state management conventions \n Addresses frequent gotchas including destructuring breaking reactivity, method binding issues, and missing state in DevTools or SSR \n Provides guidance on filter persistence, URL-based ephemeral state, and scaling Pinia for production applications \n Includes troubleshooting references for \

Authoritative guidance for implementing Stripe payment integrations across all use cases. \n \n Prioritizes Checkout Sessions API for on-session payments and subscriptions; recommends Stripe-hosted or embedded Checkout as the primary web integration surface \n Covers payment flows, subscription models, webhooks, Connect platforms, and fund management with explicit guidance on modern APIs versus deprecated endpoints \n Includes pre-launch checklist requirements, PCI compliance considerations, and

React and Next.js performance optimization guidelines across 45 rules in 8 priority categories. \n \n Covers critical waterfalls elimination, bundle size optimization, and server-side performance with specific patterns like Promise.all, dynamic imports, and React.cache() \n Includes medium-priority rules for re-render optimization, rendering performance, and JavaScript efficiency with concrete code examples \n Organized by impact level with prefixed rule names (async-, bundle-, server-, client-,