import { ApiClient, routes } from "@lodestar/api";
import { Slot } from "@lodestar/types";
import { Logger } from "@lodestar/utils";
import { Metrics } from "../metrics.js";
import { IClock } from "../util/clock.js";
export type SyncingStatus = routes.node.SyncingStatus;
type RunOnResyncedFn = (slot: Slot, signal: AbortSignal) => Promise<void>;
/**
 * Track the syncing status of connected beacon node(s)
 */
export declare class SyncingStatusTracker {
    private readonly logger;
    private readonly api;
    private readonly clock;
    private readonly metrics;
    private prevSyncingStatus?;
    private readonly fns;
    constructor(logger: Logger, api: ApiClient, clock: IClock, metrics: Metrics | null);
    /**
     * Run function when node status changes from syncing to synced
     *
     * Note: does not consider if execution client is offline or syncing and
     * hence it is not useful to schedule tasks that require a non-optimistic node.
     */
    runOnResynced(fn: RunOnResyncedFn): void;
    private checkSyncingStatus;
}
export {};
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