/**
 * Helpers for `gsk task events` — kept pure for test coverage (the
 * command action itself needs a live server, per the no-CLI-spawn test
 * convention in tests/).
 */
/** Parsed --last-seen flag: absent, a valid index, or an input error. */
export interface LastSeenParse {
    value?: number;
    error?: string;
}
export declare function parseLastSeenIndex(raw: string | undefined): LastSeenParse;
/**
 * stdout line for one intermediate NDJSON message: events are the
 * command's payload (one compact JSON line each, emitted as they
 * arrive); everything else (heartbeats, server debug lines) returns
 * undefined and stays off stdout.
 */
export declare function eventStdoutLine(msg: {
    [key: string]: unknown;
}): string | undefined;
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