Fetcher EventBus

What it does

Provides typed event bus implementations and cross-tab messengers for building robust event-driven client applications. The skill documents three bus types (SerialTypedEventBus, ParallelTypedEventBus, BroadcastTypedEventBus) and messenger fallbacks (BroadcastChannelMessenger, StorageMessenger) so agents can recommend and show code examples for ordered, concurrent, and cross-tab event handling.

When to use it

Use this skill when a developer asks about implementing event buses, ordered vs parallel handler execution, broadcasting events across browser tabs, or fallback strategies when BroadcastChannel is unavailable. It's also useful when discussing TypeScript-first handler typing and error handling patterns for event-driven flows.

What's included

• Scripts: none detected in the skill directory
• References: none detected
• Instructions: Concrete code examples for creating buses, registering handlers with ordering and once-only semantics, emitting events, and choosing between serial, parallel, and broadcast strategies. Also documents messenger APIs and storage-based fallbacks for cross-tab messaging.

Compatible agents

Best for agents that can emit code snippets and explain runtime tradeoffs (Copilot/Code assistants, Claude Code, Codex). The examples are TypeScript-focused and target browser/Node environments.