Observer

Installation: If not already installed, add the packages:

• pnpm add @efesto-cloud/observable (provides Observable)
• pnpm add @efesto-cloud/publisher (peer dependency for subscription management)

Use this skill when you need reactive state or pub/sub.

Quick Rule

• Observable: hold state (get/set) and notify on change.
• Publisher: emit events (notify) without storing state.

Procedure

1. If you need current value + updates, use Observable.
2. If you need fire-and-forget events, use Publisher.
3. Always clean subscriptions (unsubscribe or returned cleanup fn).

Common Mistakes

• Using Publisher as if it stores state.