TypeScript best practices and patterns. Use when writing TypeScript, fixing type errors, or working with generics.
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| Use Case | Prefer |
|---|---|
| Object shape | interface |
| Union types | type |
| Extending shapes | interface |
| Intersection | type |
| Tuple/primitives | type |
Discriminated Unions — model state with tagged types:
type Result<T> = { ok: true; value: T } | { ok: false; error: Error };
Type Guards — narrow at runtime:
function isUser(obj: unknown): obj is User {
return typeof obj === 'object' && obj !== null && 'id' in obj;
}
Generic Constraints:
function getProperty<T, K extends keyof T>(obj: T, key: K): T[K] { return obj[key]; }
| Type | Purpose |
|---|---|
| Partial<T> | All optional |
| Required<T> | All required |
| Pick<T,K> | Select properties |
| Omit<T,K> | Remove properties |
| Record<K,V> | Key-value map |
| ReturnType<T> | Function return type |
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Provides web accessibility best practices for semantic HTML, ARIA, keyboard navigation, color contrast, and screen reader patterns. Use when building UI components, reviewing accessibility, or when user mentions 'a11y', 'accessibility', 'ARIA', 'screen reader', 'keyboard navigation', 'WCAG'.
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Active listening techniques for effective communication. Covers attending behaviors, paraphrasing, reflective listening, clarifying questions, empathic response, barriers to listening, listening in conflict, and cross-cultural listening. Use when building listening skills, improving understanding in conversation, mediating disputes, or analyzing communication breakdowns.
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Provides best practices for AI agent orchestration including MCP servers, A2A protocol, multi-agent coordination, and swarm architectures. Use when designing agent systems, configuring MCP servers, setting up agent teams, or when user mentions 'MCP', 'A2A', 'agent orchestration', 'multi-agent', 'swarm', 'agent team', 'LangGraph', 'CrewAI', 'AutoGen'.
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Symbolic manipulation, equation solving, and algebraic structures for mathematical reasoning. Covers distributive law, factoring, completing the square, linear through polynomial equation solving, systems of equations (substitution, elimination, Gaussian elimination, matrix methods), algebraic structures (groups, rings, fields), modular arithmetic, polynomial theory, and inequalities. Use when solving equations, simplifying expressions, working with algebraic structures, or performing symbolic manipulation.
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