/**
 * ThreadMap implementations — the sessionKey → gateway threadId store.
 *
 * `InMemoryThreadMap` is the default for tests and single-process runs.
 * A persistent implementation (SQLite/file) is added in SH1 so a shuttle
 * restart doesn't start every customer's conversation over; it satisfies
 * the same {@link ThreadMap} interface, so nothing above it changes.
 */
import type { ThreadMap } from './types.js';
/** Process-local map. Lost on restart — fine for tests and ephemeral runs. */
export declare class InMemoryThreadMap implements ThreadMap {
    private readonly map;
    get(sessionKey: string): Promise<string | undefined>;
    set(sessionKey: string, threadId: string): Promise<void>;
    delete(sessionKey: string): Promise<void>;
    /** Number of bound keys (test/introspection helper). */
    get size(): number;
}
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