[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Task](https://evolu.dev/docs/api-reference/common/Task) › RunEventData

```ts
const RunEventData: union(
  /*#__PURE__*/ typed("ChildAdded", { childId: Id }),
  /*#__PURE__*/ typed("ChildRemoved", { childId: Id }),
  /*#__PURE__*/ typed("StateChanged", { state: RunSnapshotState }),
);
```

Defined in: [packages/common/src/Task.ts:1045](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Task.ts#L1045)

The event-specific payload of a [RunEvent](https://evolu.dev/docs/api-reference/common/Task/variables/RunEvent).