Create and manage mocks, stubs, spies, and test doubles for isolating unit tests from external dependencies. Use for mock, stub, spy, test double, Mockito, Jest mocks, and dependency isolation.

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Implement flash messages for one-time notifications across redirects. Use for success/error messages after form submissions.

Stripe payment integration guidelines for TypeScript, React, Next.js with secure payment processing and subscription management

适用于 TypeScript、JavaScript、React 和 Node.js 开发的通用编码标准、最佳实践和模式。

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AWS DynamoDB single-table design, GSI patterns, SDK v3 TypeScript/Python

TypeScript language expertise for writing type-safe, production-quality TypeScript code. Use for TypeScript development, advanced type system features, strict mode, type-safe APIs, and modern...

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Comprehensive React 19 patterns expert covering Server Components, Actions, use() hook, useOptimistic, useFormStatus, useFormState, React Compiler, concurrent features, Suspense, and modern...

Guides implementation of Next.js 15 App Router features with Supabase SSR. Helps choose between Server/Client Components, select correct Supabase client, and follow security patterns. Use when...

Security auditing for code vulnerabilities (OWASP Top 10, XSS, SQL injection) and dependency scanning (pnpm audit, Snyk). Use when handling user input, adding authentication, before deployments,...

Implement Server-Sent Events for real-time server-to-client updates. Use for live feeds, notifications, and streaming data.

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Expert guidance for ElysiaJS web framework development. Use when building REST APIs, GraphQL services, or WebSocket applications with Elysia on Bun. Covers routing, lifecycle hooks, TypeBox...

Comprehensive guide for building AI applications with Mastra, the TypeScript AI framework for agents and workflows. Covers LLM agents with tools and memory, multi-step workflows with...

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Create formatted business reports with data, charts, tables, and executive summaries