import type { DiagEvent, RelayQuery, RelayResult } from "@vincentt-xr/harness/events";
export declare class EventStore {
    private readonly capacity;
    private readonly buf;
    /**
     * Insertion-ordered, so the roster reads in arrival order rather than in
     * whatever order a hash lands. Labels are never removed: a viewer that
     * disconnected 20 seconds ago still has events in this buffer, and dropping
     * its label would make them unfilterable.
     */
    private readonly viewersSeen;
    /**
     * Same rule, same reason, for testers — and it matters MORE here, because
     * `--tester t1` is what a creator runs at the moment the tester who hit the
     * bug has already closed their tab.
     *
     * Note what is NOT here: a set of raw client session keys. The store used to
     * hold one and return it in `RelayResult.sessions`, which put a
     * viewer-controlled string on the terminal and in MCP tool output. The raw key
     * never enters this file; the relay maps it to a tester id first.
     */
    private readonly testersSeen;
    private latest;
    constructor(capacity?: number);
    /**
     * Ingest a batch from a client. Both the VIEWER and the TESTER come from the
     * connection's own resolution, never from the payload — the device never
     * proposes its own label (B22), and an identifier taken from the body would be
     * a viewer-supplied string flowing to the terminal and to MCP tool output.
     */
    ingest(events: DiagEvent[], tags?: {
        viewer?: string;
        tester?: string;
    }): void;
    /** Answer an MCP query against the buffer. Newest-biased when limited. */
    query(q?: RelayQuery): RelayResult;
    /** The label an event carries, for the live terminal stream. */
    viewerFor(e: DiagEvent): string | undefined;
    /** The tester an event carries, for the live terminal stream. */
    testerFor(e: DiagEvent): string | undefined;
    size(): number;
}