Add missing file

packages/streamwall/src/main/storage.ts

@@ -0,0 +1,17 @@
+import type { Low } from 'lowdb'
+import { JSONFilePreset } from 'lowdb/node'
+
+export interface StreamwallStoredData {
+  stateDoc: string
+}
+
+const defaultData: StreamwallStoredData = {
+  stateDoc: '',
+}
+
+export type StorageDB = Low<StreamwallStoredData>
+
+export async function loadStorage(dbPath: string) {
+  const db = await JSONFilePreset<StreamwallStoredData>(dbPath, defaultData)
+  return db
+}