/**
 * BridgeProvider Interface — Cross-chain bridge/swap aggregator abstraction
 *
 * Mirrors the SwapProvider interface but for cross-chain (and bridge+swap) routes.
 * Implementations: LI.FI (first), Socket/Rango/Squid (future).
 *
 * Unlike SwapProvider, bridges have:
 *   - Two chain IDs (from + to)
 *   - Destination address (may differ from sender)
 *   - A tool name (Across, Stargate, CCTP, ...) the aggregator picked
 *   - Estimated bridge duration (seconds)
 */
import type { BridgeQuoteParams, BridgeQuote } from './types';
export interface BridgeProvider {
    /** Provider name (e.g., 'lifi', 'socket') */
    readonly name: string;
    /**
     * Get a cross-chain bridge (or bridge+swap) quote.
     * @param params - from/to chain+token+amount, sender, recipient, slippage
     * @returns Quote with calldata ready to execute on the source chain
     */
    getBridgeQuote(params: BridgeQuoteParams): Promise<BridgeQuote>;
}
export declare class BridgeProviderError extends Error {
    readonly provider: string;
    readonly retryable: boolean;
    readonly statusCode?: number;
    constructor(message: string, provider: string, retryable?: boolean, statusCode?: number);
}
/**
 * Try providers in order, fall back on retryable errors.
 */
export declare function getBridgeQuoteWithFallback(providers: BridgeProvider[], params: BridgeQuoteParams): Promise<BridgeQuote>;