import type { Host } from "../../host/host.js";
import { type FocusReply } from "./protocol.js";
import { type SessionRecord } from "./record.js";
export declare function sessionsDir(host: Pick<Host, "settings" | "system">): string;
export declare function recordPaths(dir: string, pid: number): {
    json: string;
    sock: string;
};
export declare function ensureSessionsDir(dir: string): void;
export declare function writeRecord(dir: string, record: SessionRecord): void;
/** Remove one viewer's record and socket. Paths are built here from the
 *  directory and a pid, never taken from outside, so this can only ever
 *  delete files a viewer wrote. */
export declare function removeRecord(dir: string, pid: number): void;
export declare function listRecords(dir: string): SessionRecord[];
export type ProbeResult = {
    state: "live";
    focus: FocusReply;
}
/** The process is alive but did not answer in time: a viewer suspended
 *  with Ctrl+Z. Kept, never deleted. */
 | {
    state: "not-responding";
}
/** The process is gone. */
 | {
    state: "stale";
};
export type ProbedRecord = {
    record: SessionRecord;
    result: ProbeResult;
};
export declare function probe(dir: string, record: SessionRecord, timeoutMs?: number): Promise<ProbeResult>;
export declare function probeAll(dir: string, timeoutMs?: number): Promise<ProbedRecord[]>;
/** Delete the records whose process is gone, and nothing else. */
export declare function removeStale(dir: string, probed: readonly ProbedRecord[]): SessionRecord[];