# 5.14 Events and the commit feed

> Contract 2.0.0 · package sha256 `a857eca95b35921109faf997094bb4192f12527d9d0fcd4be7e97f06425bad6e` · generated from `examples/section-5/5.14-events-and-the-commit-feed.ts` by `services/onsite-scripter/scripts/build-contract-docs.mjs`; edit the source, not this file.

Imports: values (`has`, `validate`, the `Holo*Error` classes, the pure helpers) from `@holostep-configurators/runtime-client`, types from `@holostep-configurators/runtime-client/contract`, `/math` and `/testing` names from those entries; `boot` from the runtime module the root's `loadRuntimeAtFloor` resolves to. A type your page defines is your app's: declare it there, never import it from the package.

```ts
import type { JsonPatchOp, Session } from '@holostep-configurators/runtime-client/contract';
declare const session: Session;
declare const signal: AbortSignal;
declare const store: { mergeChanges(patch: readonly JsonPatchOp[]): void };
session.on('committed', ({ cause, patch }) => {
  if (cause.origin === 'store-sync') return;          // our own write
  if (!patch.some((op) => op.path.startsWith('/model/'))) return;    // a look-only commit
  store.mergeChanges(patch);                          // what this commit changed, by nodeId; never a whole model
}, { signal });
```

Back to [the examples](README.md) · [llms.txt](../llms.txt)