import type { SignalMessage, SystemInitPayload, RuntimeStateSnapshot } from '../../domain/dashboard/signal-types.js';
import type { SignalSink } from './signal-aggregator.js';
export interface WebSocketLike {
    send(data: string): void;
    readonly readyState: number;
}
export declare class SignalBroadcaster implements SignalSink {
    private readonly clients;
    private readonly startTime;
    private sequenceId;
    private totalEventsSent;
    constructor();
    addClient(ws: WebSocketLike): void;
    removeClient(ws: WebSocketLike): void;
    getClientCount(): number;
    send(signal: SignalMessage): void;
    sendInitTo(ws: WebSocketLike, payload: SystemInitPayload): void;
    sendReadyTo(ws: WebSocketLike): void;
    broadcastProjectSwitch(payload: {
        rootPath: string;
        name: string;
        sessionId: string;
    }): void;
    private currentState;
    updateState(state: Partial<RuntimeStateSnapshot>): void;
    getState(): RuntimeStateSnapshot;
    broadcastHeartbeat(): void;
}
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