import type { ChorusRunEvent } from "../types.js";
export interface RunEventState {
    runId?: string;
    status: "idle" | "running" | "success" | "error" | "aborted";
    totalVoices: number;
    voiceStatuses: Record<number, string>;
}
export interface RunMetrics {
    runs: number;
    successes: number;
    failures: number;
    retries: number;
    totalCostUsd: number;
    totalDurationMs: number;
    byProvider: Record<string, {
        runs: number;
        failures: number;
        costUsd: number;
    }>;
}
export type RunEventSink = (event: ChorusRunEvent) => void | Promise<void>;
export declare function reduceRunEvent(state: RunEventState, event: ChorusRunEvent): RunEventState;
export declare function createMetrics(): RunMetrics;
export declare function recordMetric(metrics: RunMetrics, event: ChorusRunEvent): void;
export declare class EventJournal {
    private readonly maxEvents;
    private readonly events;
    constructor(maxEvents?: number);
    append(event: ChorusRunEvent): void;
    list(): ChorusRunEvent[];
}
export declare function emitSafely(sink: RunEventSink | undefined, event: ChorusRunEvent): Promise<void>;