Express.js REST API design and implementation guide. Use when implementing REST API endpoints, creating Express routes, or setting up API project structure with MVC pattern.
Analyze and fix race conditions and concurrency bugs in async code. Use when debugging async bugs, fixing race conditions, resolving concurrency issues, or when shared state is accessed by multiple async operations.
Systematic code refactoring guide with design patterns. Use when refactoring spaghetti code, applying Strategy pattern to conditional branches, extracting functions by SRP, or replacing magic numbers with named constants.
Write accurate and complete library API documentation. Use when creating API docs, README files, or function reference documentation. Ensures all signatures, parameters, return types, and examples are precise.
Build a markdown-based static site generator with zero dependencies. Use when implementing a blog generator, markdown-to-HTML converter, static site build pipeline, or template engine from scratch using pure Node.js.
Technology/library/framework comparison analysis guide. Use when the user requests a comparative analysis of multiple technologies, libraries, or frameworks — including feature comparison, bundle size, performance, and recommendation.
Programming language interpreter design and implementation guide. Use when the user requests building an interpreter, parser, lexer, or language implementation — including Pratt parsing, AST evaluation, scope chains, and closures.
Event-driven microservice architecture patterns guide. Use when the user requests implementing microservices, event bus, SAGA pattern, orchestration, compensating transactions, or distributed system coordination.
SQL query engine design and implementation guide. Use when the user requests building a SQL engine, query parser, query planner, or query executor — including in-memory storage, SQL parsing, and query optimization.
CRDT-based real-time collaborative text editor implementation guide. Use when the user requests implementing CRDTs, real-time collaboration, conflict resolution, RGA algorithm, or convergent replicated data types.