import { BaseHandler } from "../response/base.js";
import { type HandlerContext, type HandlerMetadata, type HandlerResult } from "../types.js";
export type { HMRClientInfo } from "./hmr-client-manager.js";
export declare class HMRHandler extends BaseHandler {
    private static rateLimiter;
    private static reloadUnsubscribe;
    private static externalBroadcastSourceCount;
    private static initialized;
    metadata: HandlerMetadata;
    private static initialize;
    handle(req: Request, ctx: HandlerContext): Promise<HandlerResult>;
    /**
     * Ensure the adapter is initialized so WebSocketManager connects to receive pokes.
     * In proxy mode, adapters are lazily created per-project. If no page request has been
     * made for the project yet, the WebSocketManager won't be connected and pokes from
     * the API will never be received.
     */
    private ensureAdapterInitialized;
    static getClientCount(): number;
    static getMetrics(): {
        clients: number;
        broadcastsSent: number;
        messagesForwarded: number;
        lastBroadcastTime: number;
    };
    static registerExternalBroadcastSource(): () => void;
    static shutdown(): void;
}
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