export declare class IncarnationFence {
    #private;
    /** The current (highest admitted) incarnation for `stream`, or `undefined`. */
    current(stream: string): number | undefined;
    /**
     * Decide whether a producer at `incarnation` may write to `stream`.
     *
     * Returns `true` and advances the high-water mark when `incarnation` is `>=`
     * the current mark (a first producer, the same producer, or a takeover by a
     * newer one). Returns `false` — fenced — when `incarnation` is strictly lower
     * than a mark already established by a newer incarnation, leaving the mark
     * untouched.
     */
    admit(stream: string, incarnation: number): boolean;
    /** Forget a stream's incarnation mark (e.g. when the stream is fully torn down). */
    forget(stream: string): void;
}