/**
 * @module identity/keystone-sync-service
 *
 * On-Demand Keystone Sync Service.
 * Provides functions to check for keystone updates on the server and sync updated keystone DAG graphs locally.
 */
import { KeystoneIbGib_V1 } from "@ibgib/core-gib/dist/keystone/keystone-types.mjs";
export interface KeystoneUpdateCheckResult {
    hasUpdate: boolean;
    serverN: number;
    localN: number;
    serverLatestAddr: string;
    graph: Record<string, KeystoneIbGib_V1>;
}
export declare class KeystoneSyncService {
    protected lc: string;
    private dispatchUpdateAvailableEvent;
    private dispatchRenewalRequiredEvent;
    /**
     * Retrieves the stored device delegate secret ($S_D$) for a delegate timeline from IndexedDB.
     */
    getDeviceDelegateSecret({ delegateTjpAddr }: {
        delegateTjpAddr: string;
    }): Promise<string | undefined>;
    /**
     * Checks if the active identity has a valid, verified, unexpired sync delegate on this device.
     */
    checkDelegateStatus({ activePrimaryAddr, metaspace, space }: {
        activePrimaryAddr: string;
        metaspace?: any;
        space?: any;
    }): Promise<{
        isValid: boolean;
        reason?: 'expired' | 'missing_secret';
    }>;
    /**
     * Checks if a server update exists for the given active primary keystone address.
     */
    checkForKeystoneUpdate({ activePrimaryAddr, metaspace, space }: {
        activePrimaryAddr: string;
        metaspace?: any;
        space?: any;
    }): Promise<KeystoneUpdateCheckResult>;
    /**
     * Checks for updates and registers any missing server keystone frames into local space.
     * Returns the updated (or current) primary keystone frame.
     */
    updateActiveKeystone({ activePrimaryAddr, metaspace, space }: {
        activePrimaryAddr: string;
        metaspace?: any;
        space?: any;
    }): Promise<KeystoneIbGib_V1 | undefined>;
}
export declare function getKeystoneSyncService(): KeystoneSyncService;
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