observer-pattern

Implement a typed publish/subscribe event bus with subscription management and cleanup.

Updated Apr 10, 2026

Search Tags:#subscriptions #event-driven #decoupling #event-bus #pub-sub #observer

Ready to run

npx skills add https://github.com/erichugy/agentic.skills --skill observer-pattern-erichugy

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: observer-pattern
Source: https://github.com/erichugy/agentic.skills/tree/main/observer-pattern
Command: npx skills add https://github.com/erichugy/agentic.skills --skill observer-pattern-erichugy

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Observer/pub-sub design pattern. Apply when building event systems, reactive state, notification systems, or when you need to decouple producers from consumers. Covers event emitters, subscriptions, and cleanup.

Core Features & Use Cases

Loose coupling between producers and consumers via events.
Support for multi-listener subscriptions and cleanup to prevent leaks.
Use cases include UI event handling, plugin systems, and real-time analytics streams.

Quick Start

Start by creating a central bus and subscribing a listener before emitting an event.

Frequently Asked Questions about observer-pattern

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I decouple components for event-driven communication in a modular architecture?▼

To decouple components for event-driven communication, implement a publish/subscribe event bus that separates producers from consumers. This allows modules to emit and listen to typed events without direct dependencies, ensuring predictable reactive state updates across your system.

What is the best way to manage pub-sub subscriptions and prevent memory leaks in UI event handling?▼

The best way to manage pub-sub subscriptions and prevent memory leaks is using subscription management and cleanup semantics. By properly unregistering listeners when components unmount, you ensure no dangling references remain in the event bus.

How does an event bus handle multi-listener subscriptions for real-time analytics streams?▼

An event bus handles multi-listener subscriptions for real-time analytics streams by broadcasting emitted events to all registered listeners simultaneously. This supports cross-component notifications while maintaining loose coupling between the data producers and consumers.

Can I use a typed event emitter for plugin systems and cross-component notifications?▼

Yes, you can use a typed event emitter for plugin systems and cross-component notifications. Typed events ensure predictable behavior by validating event payloads at compile time, allowing plugins to safely subscribe to specific modular architecture events.

When should I not use the observer pattern for reactive state updates?▼

You should not use the observer pattern for reactive state updates when components require synchronous, tightly coupled execution, or when direct function calls are more efficient. Over-implenting pub-sub for simple, localized state changes introduces unnecessary indirection and complexity.