import type { AgentSpan } from '../types/trace.js';
import type { TraceSink } from './TraceStore.js';
export interface OtelTraceSinkOptions {
    endpoint: string;
    headers?: Record<string, string>;
    serviceName?: string;
    batchSize?: number;
    fetch?: typeof fetch;
}
export declare class OtelTraceSink implements TraceSink {
    private readonly options;
    private readonly pending;
    private exporting?;
    constructor(options: OtelTraceSinkOptions);
    write(span: AgentSpan): Promise<void> | void;
    flush(): Promise<void>;
    private export;
}
export declare function otelSink(options: OtelTraceSinkOptions): OtelTraceSink;
export interface LangfuseSinkOptions {
    endpoint?: string;
    publicKey: string;
    secretKey: string;
    serviceName?: string;
    batchSize?: number;
    fetch?: typeof fetch;
}
export declare function langfuseSink(options: LangfuseSinkOptions): OtelTraceSink;
export declare function toOtlpPayload(spans: AgentSpan[], serviceName?: string): {
    resourceSpans: {
        resource: {
            attributes: {
                key: string;
                value: {
                    stringValue: string;
                };
            }[];
        };
        scopeSpans: {
            scope: {
                name: string;
            };
            spans: {
                name: string;
                kind: number;
                startTimeUnixNano: string;
                endTimeUnixNano: string;
                attributes: ({
                    key: string;
                    value: {
                        boolValue: boolean;
                        intValue?: undefined;
                        doubleValue?: undefined;
                        stringValue?: undefined;
                    };
                } | {
                    key: string;
                    value: {
                        intValue: string;
                        boolValue?: undefined;
                        doubleValue?: undefined;
                        stringValue?: undefined;
                    };
                } | {
                    key: string;
                    value: {
                        doubleValue: number;
                        boolValue?: undefined;
                        intValue?: undefined;
                        stringValue?: undefined;
                    };
                } | {
                    key: string;
                    value: {
                        stringValue: string;
                        boolValue?: undefined;
                        intValue?: undefined;
                        doubleValue?: undefined;
                    };
                })[];
                events: {
                    name: string;
                    timeUnixNano: string;
                    attributes: ({
                        key: string;
                        value: {
                            boolValue: boolean;
                            intValue?: undefined;
                            doubleValue?: undefined;
                            stringValue?: undefined;
                        };
                    } | {
                        key: string;
                        value: {
                            intValue: string;
                            boolValue?: undefined;
                            doubleValue?: undefined;
                            stringValue?: undefined;
                        };
                    } | {
                        key: string;
                        value: {
                            doubleValue: number;
                            boolValue?: undefined;
                            intValue?: undefined;
                            stringValue?: undefined;
                        };
                    } | {
                        key: string;
                        value: {
                            stringValue: string;
                            boolValue?: undefined;
                            intValue?: undefined;
                            doubleValue?: undefined;
                        };
                    })[];
                }[];
                status: {
                    code: number;
                };
                parentSpanId?: string | undefined;
                traceId: string;
                spanId: string;
            }[];
        }[];
    }[];
};