Migrate LiveSync flows to provider-owned resources

src/common/replicatorResources/shared.ts

@@ -0,0 +1,21 @@
+import type { RemoteDBSettings } from "@vrtmrz/livesync-commonlib/compat/common/types";
+
+export interface ResourceReplicator {
+    closeReplication(): void | Promise<void>;
+}
+
+/** Create one idempotent asynchronous disposer for a private Replicator. */
+export function createReplicatorDisposer(replicator: ResourceReplicator): () => Promise<void> {
+    let disposal: Promise<void> | undefined;
+    return () => {
+        if (disposal === undefined) {
+            disposal = Promise.resolve().then(() => replicator.closeReplication());
+        }
+        return disposal;
+    };
+}
+
+/** Fence a finite resource from later edits to its source settings object. */
+export function snapshotRemoteSettings(setting: RemoteDBSettings): RemoteDBSettings {
+    return { ...setting };
+}