import { type PipelineBus } from "./pipeline-bus.js";
import { type Scheduler } from "./scheduler.js";
export interface FallbackProvider<TReq, TResp> {
    readonly id: string;
    send(req: TReq, signal: AbortSignal): Promise<TResp>;
    healthProbe(signal: AbortSignal): Promise<boolean>;
}
export interface ProviderFallbackOptions {
    readonly bus: PipelineBus;
    readonly contextId: string;
    readonly attemptTimeoutMs: number;
    readonly recoveryProbeIntervalMs: number;
    readonly scheduler?: Scheduler;
}
export declare class ProviderFallback<TReq, TResp> {
    private readonly providers;
    private readonly opts;
    private readonly unavailable;
    private readonly recoveryTimers;
    private readonly scheduler;
    constructor(providers: readonly FallbackProvider<TReq, TResp>[], opts: ProviderFallbackOptions);
    send(req: TReq): Promise<TResp>;
    close(): void;
    private markUnavailable;
    private scheduleRecoveryProbe;
    private metric;
}
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