/**
 * Langfuse Observability Integration
 */
import { BaseObservabilityProvider, Span, TraceContext, LogEntry, Metric } from './base';
export interface LangfuseConfig {
    publicKey: string;
    secretKey: string;
    baseUrl?: string;
    flushAt?: number;
    flushInterval?: number;
}
export declare class LangfuseObservabilityProvider extends BaseObservabilityProvider {
    private publicKey;
    private secretKey;
    private baseUrl;
    private queue;
    private flushAt;
    private flushInterval;
    private flushTimer?;
    constructor(config: LangfuseConfig);
    private startFlushTimer;
    private request;
    private enqueue;
    startSpan(name: string, attributes?: Record<string, any>, parentContext?: TraceContext): Span;
    endSpan(span: Span, status?: 'ok' | 'error', error?: Error): void;
    addSpanEvent(span: Span, name: string, attributes?: Record<string, any>): void;
    log(entry: LogEntry): void;
    recordMetric(metric: Metric): void;
    flush(): Promise<void>;
    shutdown(): Promise<void>;
}
export declare function createLangfuseObservability(config: LangfuseConfig): LangfuseObservabilityProvider;