import type { SessionPort } from "./port.js";
export type SessionServerOptions = {
    dir: string;
    logPath: string;
    commentsPath: string | undefined;
    /** The viewer's pid; a test may pick another to keep records apart. */
    pid?: number;
};
export type SessionServer = {
    socketPath: string;
    stop(): Promise<void>;
};
/** Why no server was started: the shell shows this once if asked for a
 *  session key, and otherwise runs as before. */
export type SessionUnavailable = {
    unavailable: string;
};
export declare function startSessionServer(port: SessionPort, options: SessionServerOptions): Promise<SessionServer | SessionUnavailable>;
export declare function isUnavailable(started: SessionServer | SessionUnavailable): started is SessionUnavailable;