import type { TraceRecord } from './types.js';
/** Bounded OTLP/HTTP JSON exporter. No hidden SDK queue or durable replay. */
export declare class LangfuseTarget {
    private baseUrl;
    private publicKey;
    private secretKey;
    private queue;
    private bytes;
    private timer?;
    private sending?;
    private controller?;
    private closed;
    private lastWarning;
    dropped: number;
    lastSuccess?: number;
    lastFailure?: number;
    lastError?: string;
    constructor(baseUrl: string, publicKey: string, secretKey: string);
    status(): {
        state: string;
        pending: number;
        dropped: number;
        lastSuccess: number;
        lastFailure: number;
        lastError: string;
    };
    enqueue(record: TraceRecord): void;
    flush(): Promise<void>;
    private send;
    close(): void;
}