/**
 * Collapse repeats of a log line that can fire on a hot path.
 *
 * An error describing a *steady state* — a queue that is full, a service that
 * is down — is emitted once per attempt, and attempts can run at loop speed.
 * One such line filled 119 MB of log with 151,981 copies of the same sentence
 * and buried every other diagnostic in the file (SKY-104).
 *
 * The first occurrence is always emitted immediately, so nothing is hidden;
 * repeats are folded into a periodic summary carrying the suppressed count.
 */
export type LogThrottle = {
    /** Emit `message` if it is new or the window has elapsed, else count it. */
    emit: (message: string) => void;
    /** Flush any pending suppression summary — call when the condition clears. */
    reset: () => void;
};
export declare function createLogThrottle(options: {
    windowMs: number;
    sink: (line: string) => void;
}): LogThrottle;