/** A parsed join/leave event extracted from one server log line (#528, Phase 4). */
export interface PlayerSessionEvent {
    type: 'join' | 'leave';
    playerName: string;
    at: Date;
}
/**
 * Parse the RFC3339Nano timestamp `docker logs --timestamps` prefixes onto
 * every line (join/leave or not), or `null` when the line has no valid
 * timestamp prefix. Pure — no I/O.
 */
export declare function parseDockerLogTimestamp(line: string): Date | null;
/**
 * Parse one `docker logs --timestamps` line into a join/leave event, or
 * `null` when the line isn't a player join/leave message. Pure — no I/O.
 */
export declare function parsePlayerSessionEvent(line: string): PlayerSessionEvent | null;
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