feat: add snjs package

packages/snjs/lib/Services/Sync/Offline/Operation.ts

@@ -0,0 +1,29 @@
+import {
+  CreateOfflineSyncSavedPayload,
+  DecryptedPayloadInterface,
+  DeletedPayloadInterface,
+} from '@standardnotes/models'
+import { ResponseSignalReceiver, SyncSignal } from '@Lib/Services/Sync/Signals'
+
+import { OfflineSyncResponse } from './Response'
+
+export class OfflineSyncOperation {
+  /**
+   * @param payloads  An array of payloads to sync offline
+   * @param receiver  A function that receives callback multiple times during the operation
+   */
+  constructor(
+    private payloads: (DecryptedPayloadInterface | DeletedPayloadInterface)[],
+    private receiver: ResponseSignalReceiver<OfflineSyncResponse>,
+  ) {}
+
+  async run() {
+    const responsePayloads = this.payloads.map((payload) => {
+      return CreateOfflineSyncSavedPayload(payload)
+    })
+
+    const response = new OfflineSyncResponse(responsePayloads)
+
+    await this.receiver(SyncSignal.Response, response)
+  }
+}