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new-domain-event Add a new domain event type to the transactional outbox system. Use when adding events like invitation.accepted, user.deleted, or any new aggregate event.
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name new-domain-event description Add a new domain event type to the transactional outbox system. Use when adding events like invitation.accepted, user.deleted, or any new aggregate event. argument-hint <aggregate>.<past-tense-verb>
Add a New Domain Event Type
Add a new event type to the transactional outbox system. The event name must follow <aggregate>.<past-tense-verb> convention (e.g. invitation.accepted, user.deleted).
Steps
1. Register the event type in contracts
File: packages/contracts/src/literals.ts
Add the new event type string to domainEventTypes and (if new aggregate) to domainEventAggregateTypes:
export const domainEventTypes = ['organization.created' , '$ARGUMENTS' ] as const
2. Add payload interface in the domain layer
File: packages/core/src/domains/<aggregate>/domain/<aggregate>-events.ts
Create or extend the events file with a typed payload interface. The interface name must be <PascalCaseEventType>EventPayload:
export interface <PascalCase >EventPayload
If the file already exists (e.g. organization-events.ts), add the new interface alongside existing ones.
3. Re-export from the domain's public events.ts File: packages/core/src/domains/<aggregate>/events.ts
Re-export the payload type and add the event discriminant + version:
export type { <PascalCase >EventPayload } from './domain/<aggregate>-events.js'
export const <aggregate>Events = {
<verb>: '<aggregate>.<verb>' ,
} as const
export const <aggregate>EventVersions = {
'<aggregate>.<verb>' : 1 ,
} as const
If events.ts doesn't exist yet, create it. This is the public cross-domain contract — other domains may ONLY import from this file.
4. Export from packages/core/src/index.ts export { <aggregate>Events , <aggregate>EventVersions } from './domains/<aggregate>/events.js'
export type { <PascalCase >EventPayload } from './domains/<aggregate>/events.js'
5. Add payload schema in temporal-client File: packages/temporal-client/src/types/domain-event.ts
Add a matching effect/Schema struct. The export name must be <PascalCaseEventType>EventPayloadSchema:
export const <PascalCase >EventPayloadSchema = Schema .Struct ({
})
Re-export from packages/temporal-client/src/index.ts if not already.
6. Add handler case in the worker workflow dispatcher File: apps/worker/src/workflows.ts
Add a case inside the switch (event.eventType) block in outboxPollerWorkflow:
case '<aggregate>.<verb>' : {
break
}
Requirements enforced by lint:
workflowId must contain event.id (idempotent dispatch)workflowIdReusePolicy: 'REJECT_DUPLICATE'parentClosePolicy: ParentClosePolicy.ABANDONNo as type assertions on .payload
7. Add the handler workflow function File: apps/worker/src/workflows.ts
export async function <eventName>Workflow (event : SerializedDomainEvent ): Promise <void > {
}
8. Add activity if needed File: apps/worker/src/activities.ts
Add the activity function and register it in the activities object.
9. Write the event transactionally File: packages/infra/db/src/repositories/<aggregate>.ts
Either reuse the existing createWithEvent pattern or add a new *WithEvent method that writes the domain event inside db.transaction().
10. Wire through the port and adapter
Port: packages/core/src/domains/<aggregate>/ports/<aggregate>-ports.ts — add method signatureAdapter: packages/core/src/domains/<aggregate>/adapters/<aggregate>-adapters.ts — wire to repositoryService: packages/core/src/domains/<aggregate>/application/<aggregate>-service.ts — call the port method
11. Add integration tests File: packages/testkit/src/domain-events-outbox.integration.test.ts
Test that the event is written transactionally, has correct payload, and follows the full lifecycle.
12. Verify pnpm lint
pnpm type-check
pnpm test
pnpm test :integration
Enforcement Rules The lint script scripts/lint/enforce-domain-event-contracts.mjs checks:
Every eventType: 'x.y' string is registered in domainEventTypes
Each event type has a *EventPayload interface in the domain layer
Each event type has a *EventPayloadSchema in temporal-client
Service layer cannot import domain-events repository directly
Domain event inserts must be inside db.transaction()
Every registered event type has a case in the workflow dispatcher
startChild calls include event.id in workflowIdNo as type assertions on .payload in worker files
Event type names match <lowercase>.<lowercase> convention
apps/api/ cannot import @temporalio/* Run pnpm lint after each step — it tells you exactly what's missing.
Reference Files File Role packages/contracts/src/literals.tsEvent type registry packages/core/src/domains/<domain>/events.tsPublic cross-domain event contract packages/core/src/domains/*/domain/*-events.tsInternal payload interfaces packages/temporal-client/src/types/domain-event.tsPayload schemas apps/worker/src/workflows.tsPoller dispatcher + handler workflows apps/worker/src/activities.tsActivity implementations packages/infra/db/src/repositories/*.tsTransactional write (outbox pattern) scripts/lint/enforce-domain-event-contracts.mjsStructural enforcement
