/**
 * A cheap check, for `dkg status`, that an external store answers at all.
 *
 * The quad count is too expensive to run on every status request, so it is
 * reused for minutes, and a store that dies meanwhile would keep showing its
 * last count. `ASK { ?s ?p ?o }` returns at the first triple, so it can run on
 * every explicit request.
 *
 * The probe is never aborted. On a managed Oxigraph, abandoning a read that
 * was already sent hands it to the retained-deadline recovery, which restarts
 * the server at the read's deadline because Oxigraph keeps evaluating it; a
 * slow probe must not restart a busy, healthy store. A caller waits a bounded
 * time instead, and concurrent callers share the probe that is still running.
 */
import type { DKGAgent } from '@origintrail-official/dkg-agent';
import type { StoreReachability } from '../status-store-quads-wire.js';
/**
 * Whether the external store answers, waiting at most `waitMs` for it; a
 * probe that has not settled by then keeps running and later callers share
 * it. Never rejects.
 */
export declare function probeExternalStore(agent: DKGAgent, waitMs?: number): Promise<StoreReachability>;
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