createPersister

The createPersister method is used to return a persister for the Durable Object to preserve Store data when clients are not connected.

createPersister(): undefined | Persister<MergeableStoreOnly> | Promise<Persister<MergeableStoreOnly>>

In other words, override this method to enable persistence of the Store data that the Durable Object is synchronizing between clients.

This should almost certainly return a DurableObjectStoragePersister, created with the createDurableObjectStoragePersister function. This will ensure that the Store is serialized to the Durable Object KV-based storage.

Returning undefined from this method will disable persistence.

import {WsServerDurableObject} from 'tinybase/synchronizers/synchronizer-ws-server-durable-object';
import {createDurableObjectStoragePersister} from 'tinybase/persisters/persister-durable-object-storage';
import {createMergeableStore} from 'tinybase';

export class MyDurableObject extends WsServerDurableObject {
  createPersister() {
    const store = createMergeableStore();
    const persister = createDurableObjectStoragePersister(
      store,
      this.ctx.storage,
    );
    return persister;
  }
}