/**
 * Small shared helpers for the scheduler module.
 */
/** Format minutes as a SLURM walltime string (`D-HH:MM:SS` or `HH:MM:SS`). */
export declare function formatWalltime(minutes: number): string;
/** POSIX single-quote a string so it is safe to embed in a shell script. */
export declare function shellQuote(s: string): string;
/**
 * Compress a job log's tail into a one-line failure reason: the last few
 * non-empty lines (the error is at the end), capped so a pathological log
 * can't flood the UI. Null when there is nothing to say.
 */
export declare function summarizeLogTail(content: string): string | null;