import type { Settings } from "../config/settings";
import { type LazyService } from "../runtime/lazy-service";
import type { MemoryBackend } from "./types";
/**
 * Build the lazy runtime service for the selected memory backend.
 *
 * The identity resolver is deliberately config-only. Backend implementations
 * enter the module graph only when this service is first activated, and the
 * resident no-op backend keeps `memory.backend=off` import-free.
 */
export declare function createMemoryBackendService(settings: Settings): LazyService<MemoryBackend>;