fetcher-eventbus

name	fetcher-eventbus
description	Use when implementing typed event buses, serial or parallel event execution, BroadcastChannel or storage-based cross-tab messaging, handler priority, once handlers, name generation, or event synchronization across browser contexts.

fetcher-eventbus

Use This Skill When

• The task mentions event bus, event handlers, broadcasts, or cross-tab communication.
• The task needs serial versus parallel event execution semantics.
• The task involves BroadcastChannel, storage fallback messaging, or cross-tab sync.
• The task needs handler ordering, duplicate-name prevention, or once-only handlers.

Workflow

1. Choose SerialTypedEventBus when ordering and sequential side effects matter.
2. Choose ParallelTypedEventBus when handlers are independent and latency matters.
3. Choose BroadcastTypedEventBus or a cross-tab messenger for browser-tab synchronization.
4. Give handlers stable names and explicit order values when behavior must be predictable.
5. Load references/api.md for interface details, messenger fallback behavior, and examples.

Key Practices

• Use one event type per focused bus unless a multi-type router materially reduces duplication.
• Treat handler names as identifiers, not labels; duplicate names are rejected.
• Call cleanup functions or destroy() for long-lived UI and test code.

References

• references/api.md: Detailed package API, examples, and edge-case guidance. Load it only when the task needs TypedEventBus contracts, event handler fields, serial/parallel/broadcast examples, messenger APIs, and fallback chains.

Related Skills

• $fetcher-storage: Use when eventing is tied to persistent key-value state.
• $fetcher-react-hooks: Use when React components subscribe to event buses.
• $fetcher-cosec-auth: Use when auth token or device storage changes must broadcast.