/**
 * Session-generation gate for fleet event bridges.
 *
 * Fleet event bridges must discard events from subagents that were spawned
 * before the last `/clear`. This shared hook encapsulates that logic so any
 * bridge can apply it consistently. Currently consumed by
 * `useDirectorFleetBridge` (Director FleetBus streaming); `useSubagentEvents`
 * (EventBus lifecycle) does not gate on generation today.
 *
 * Usage:
 * ```ts
 * const gate = useFleetGenerationGate(sessionGenerationRef);
 * // On subagent spawn / first-seen:
 * gate.track(id);
 * // Before processing any event:
 * if (!gate.isLive(id)) return;
 * // On subagent removal:
 * gate.forget(id);
 * ```
 *
 * When `sessionGenerationRef` is absent (no /clear support wired), `isLive`
 * always returns `true` — backward-compatible no-op.
 */
export interface FleetGenerationGate {
    /** Record that a subagent was first seen at the current generation.
     *  Call on spawn or first event. No-op when no sessionGenerationRef. */
    track: (subagentId: string) => void;
    /** Returns true if the subagent's events should be processed.
     *  Returns false after /clear bumps the generation. */
    isLive: (subagentId: string) => boolean;
    /** Clean up tracking for a removed subagent. */
    forget: (subagentId: string) => void;
    /** Drop tracking entries older than the previous generation (bounds the map). */
    sweep: () => void;
}
export declare function useFleetGenerationGate(sessionGenerationRef?: {
    current: number;
} | undefined): FleetGenerationGate;
//# sourceMappingURL=use-fleet-generation-gate.d.ts.map