/**
 * @octomil/browser — Gradient cache for federated learning resilience
 *
 * Uses IndexedDB to persist gradient deltas across page reloads and
 * network interruptions. Unsubmitted gradients can be retried when
 * connectivity is restored.
 */
import type { GradientCacheEntry } from "./types.js";
export declare class GradientCache {
    private dbPromise;
    private openDb;
    /** Store a gradient entry in IndexedDB. */
    store(entry: GradientCacheEntry): Promise<void>;
    /** Retrieve a gradient entry by round ID. */
    get(roundId: string): Promise<GradientCacheEntry | null>;
    /** List all pending (unsubmitted) gradient entries. */
    listPending(): Promise<GradientCacheEntry[]>;
    /** Mark an entry as submitted. */
    markSubmitted(roundId: string): Promise<void>;
}
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