import { FlushSentinel, voice } from '@livekit/agents';
import type { llm } from '@livekit/agents';
import type { VoiceSpeechCompleteHook, VoiceTurnMetricsHook } from './turn-metrics.js';
/**
 * Use from a custom Agent.llmNode when using MastraLLM. LiveKit's LLMStream only accepts
 * ChatChunks; this node translates our boundary metadata into LiveKit's supported marker.
 */
export declare function mastraLLMNode(agent: voice.Agent, chatCtx: llm.ChatContext, toolCtx: llm.ToolContext, modelSettings: voice.ModelSettings): Promise<ReadableStream<llm.ChatChunk | string | FlushSentinel> | null>;
export interface ObserveVoiceSessionOptions {
    onTurnMetrics?: VoiceTurnMetricsHook;
    onSpeechComplete?: VoiceSpeechCompleteHook;
}
/**
 * Attach before session.start(). Observes generation-independent playback completion;
 * never writes memory. Return value detaches listeners and finalizes pending speech as cancelled.
 * LiveKit's transcript can be estimated. Server output cannot confirm remote human hearing.
 */
export declare function observeVoiceSession(session: voice.AgentSession, options: ObserveVoiceSessionOptions): () => void;
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