import type { ReloadProjectInfo } from "../../reload-notifier.js";
interface HMRMetrics {
    broadcastsSent: number;
    messagesForwarded: number;
    lastBroadcastTime: number;
}
export declare function getMetrics(): {
    clients: number;
} & HMRMetrics;
/**
 * Broadcast update to all connected HMR clients, optionally filtered by projectSlug.
 * No server-side debounce here — ReloadNotifier already debounces (300ms).
 */
export declare function broadcastUpdate(changedPaths?: string[], project?: ReloadProjectInfo): void;
export declare function resetMetrics(): void;
export {};
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