Multi-Event Listeners

A listener can subscribe to one event or many events.

Example

import { defineListener } from '@holo-js/events'
import UserRegistered from '../events/user/registered'
import UserDeleted from '../events/user/deleted'

export default defineListener({
  listensTo: [UserRegistered, UserDeleted] as const,
  async handle(event) {
    if (event.name === 'user.registered') {
      await audit.log('registered', event.payload.userId)
      return
    }

    if (event.name === 'user.deleted') {
      await audit.log('deleted', event.payload.userId)
    }
  },
})

Notes

• listener registration expands to both event names internally
• one listener id, many event index entries
• listener execution order is deterministic by registration order per event

Event references

listensTo accepts:

• event definitions (defineEvent(...) return values)
• explicit event name strings

String references must be non-empty normalized event names.

Continue

• Defining Listeners
• Dispatching Events