import type { HttpConfig } from './types';
export interface SyncEngineConfig extends HttpConfig {
    /** Max retry attempts per run */
    maxAttempts?: number;
    /** Base backoff milliseconds */
    backoffBaseMs?: number;
    /** Max backoff milliseconds */
    backoffMaxMs?: number;
}
/**
 * SyncEngine v2 (JS scheduler facade).
 *
 * - Native remains the source of truth for background-safe HTTP uploads.
 * - This engine adds non-blocking scheduling + retry/backoff semantics for foreground and
 *   for callers that want deterministic control.
 */
export declare class SyncEngine {
    private config;
    private inFlight;
    private attempt;
    private timer;
    private appStateSub;
    configure(config: SyncEngineConfig): void;
    start(): void;
    stop(): void;
    trigger(reason?: string): Promise<void>;
}
export declare const syncEngine: SyncEngine;
export default syncEngine;
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