import type { BackgroundAgentRegistry } from '../agent/background-registry.js';
import type { SessionStats } from './slash/types.js';
export interface HealthRailOptions {
    stream?: NodeJS.WriteStream;
    backgroundRegistry?: BackgroundAgentRegistry;
    getExtraRows: () => number;
}
export declare class HealthRail {
    private readonly stream;
    private readonly registry;
    private readonly getExtraRows;
    private started;
    private snapshot;
    private onRowCountChange?;
    private resizeUnsub;
    private tickInterval;
    private totalSubsEver;
    constructor(opts: HealthRailOptions);
    setRowCountChangeHandler(handler: (rows: number) => void): void;
    start(): void;
    stop(): void;
    update(stats: SessionStats, contextRatioOverride?: number): void;
    redraw(): void;
    private repaint;
    private clearRow;
}