---
status: draft
last_updated: 2026-05-07
---

# In-Process Event Target

No adapter needed. `createPubSub` uses `new EventTarget()` by default.

This works for single-process deployments where all pubsub participants share the same memory. The web standard `EventTarget` already implements `addEventListener`/`dispatchEvent`/`removeEventListener`.

```ts
const pubsub = createPubSub<MyEventMap>();
// uses new EventTarget() by default
```

Could be formalized as an explicit `InProcessEventTarget` for documentation purposes, but there's no functional need — the browser/Node `EventTarget` is the reference implementation of the `TypedEventTarget` contract.

## Design Notes

- Topics use the `type:id` string convention (e.g., `"call.responded:uuid-123"`)
- `CustomEvent.detail` carries the full `EventEnvelope` object
- No serialization — objects are passed by reference
- Synchronous dispatch — listeners fire immediately in the current call stack
- No connection lifecycle, no reconnection concerns