/**
 * In-process event bus for agent state transitions.
 *
 * Spec §5.8: "the file is canonical … the [notify] ping just makes detection
 * lower-latency." This bus is the in-process equivalent of the notify-socket
 * ping for SDK agents — they share the parent's event loop, so we can signal
 * the widget directly without serializing through a Unix socket.
 *
 * RPC and tmux agents (out-of-process) will reach the same listener by way of
 * the notify-socket handler, which can simply re-emit on this bus when it
 * arrives. Either way, the listener treats the event as a hint to re-read
 * the agent status YAML — the file remains the source of truth.
 */
import { EventEmitter } from "node:events";
export type AgentUpdateKind = "progress" | "completion" | "error";
export interface AgentUpdate {
    agentId: string;
    kind: AgentUpdateKind;
}
declare class AgentEventBus extends EventEmitter {
    emitUpdate(update: AgentUpdate): void;
    onUpdate(listener: (update: AgentUpdate) => void): () => void;
}
export declare const agentEvents: AgentEventBus;
/** Test helper — drop all listeners so unit tests can isolate behavior. */
export declare function _resetAgentEventsForTest(): void;
export {};
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