export declare const TAIL_MAX_LINES = 5;
export declare const TAIL_THROTTLE_MS = 300;
export type TailCallback = (tail: string | undefined) => void;
export declare class RollingTailBuffer {
    private readonly onChange;
    private readonly maxLines;
    private readonly throttleMs;
    private lines;
    private lastNotifiedAt;
    private pendingFlush;
    private cleared;
    private atLineBoundary;
    constructor(onChange: TailCallback, maxLines?: number, throttleMs?: number);
    push(raw: string): void;
    peek(): string | undefined;
    clear(): void;
    private scheduleNotify;
    private fireNotify;
}