import type { ExporterHealthStatus, ExportResult, LangfuseExporterConfig, SpanData } from "../../types/index.js";
import { BaseExporter } from "./baseExporter.js";
/**
 * @description Exporter that delivers observation spans to Langfuse's OTLP/HTTP JSON endpoint (`POST /api/public/otel/v1/traces`), which keeps native observation types and identity on every observation. Spans are queued without blocking and sent in batches; failed requests are retried with backoff when the failure is transient (429, 5xx, network).
 */
export declare class LangfuseExporter extends BaseExporter {
    private readonly langfuse;
    private readonly authorization;
    private readonly baseUrl;
    private readonly policy;
    private readonly inflight;
    /**
     * @description Creates an exporter for one Langfuse project.
     * @param config {LangfuseExporterConfig} - Credentials, endpoint, environment, release, masking and batching options. `environment` and `release` fall back to `LANGFUSE_TRACING_ENVIRONMENT` and `LANGFUSE_RELEASE`, and only fill spans that do not carry them already.
     */
    constructor(langfuse: LangfuseExporterConfig);
    initialize(): Promise<void>;
    exportSpan(span: SpanData): Promise<ExportResult>;
    exportBatch(spans: SpanData[]): Promise<ExportResult>;
    flush(): Promise<void>;
    private exportQuietly;
    shutdown(): Promise<void>;
    healthCheck(): Promise<ExporterHealthStatus>;
    protected ping(): Promise<void>;
    private deliver;
    private post;
}