import { BaseCallbackHandlerInput } from "@langchain/core/callbacks/base";
import { BaseTracer, Run } from "@langchain/core/tracers/base";
import { Document } from "@langchain/core/documents";
import { KVMap } from "langsmith/schemas";
export type DatadogLLMObsSpanKind = "llm" | "workflow" | "agent" | "tool" | "task" | "embedding" | "retrieval";
export type DatadogLLMObsIO = {
    value: string;
} | {
    documents: {
        text?: string;
        id?: string;
        name?: string;
        score: string | number;
    }[];
} | {
    messages: {
        content: string;
        role?: string;
    }[];
};
export interface DatadogLLMObsSpan {
    span_id: string;
    trace_id: string;
    parent_id: string;
    session_id?: string;
    name: string;
    start_ns: number;
    duration: number;
    error: number;
    status: string;
    tags?: string[];
    meta: {
        kind: DatadogLLMObsSpanKind;
        model_name?: string;
        model_provider?: string;
        temperature?: string;
        input: DatadogLLMObsIO;
        output: DatadogLLMObsIO | undefined;
    };
    metrics: {
        [key: string]: number;
    };
}
export interface DatadogLLMObsRequestBody {
    data: {
        type: "span";
        attributes: {
            ml_app: string;
            tags: string[];
            spans: DatadogLLMObsSpan[];
            session_id?: string;
        };
    };
}
export type FormatDocument<Metadata extends Record<string, any> = Record<string, any>> = (document: Document<Metadata>) => {
    text: string;
    id: string;
    name: string;
    score: number;
};
export interface DatadogLLMObsTracerFields extends BaseCallbackHandlerInput {
    mlApp: string;
    userId?: string;
    userHandle?: string;
    sessionId?: string;
    env?: string;
    service?: string;
    tags?: Record<string, string | undefined>;
    ddApiKey?: string;
    ddLLMObsEndpoint?: string;
    formatDocument?: FormatDocument;
}
export declare class DatadogLLMObsTracer extends BaseTracer implements DatadogLLMObsTracerFields {
    name: string;
    ddLLMObsEndpoint?: string;
    protected endpoint: string;
    protected headers: Record<string, string>;
    mlApp: string;
    sessionId?: string;
    tags: Record<string, string | undefined>;
    formatDocument?: FormatDocument;
    constructor(fields: DatadogLLMObsTracerFields);
    protected persistRun(_run: Run): Promise<void>;
    protected convertRunToDDSpans(run: Run): DatadogLLMObsSpan[];
    protected formatRequestBody(spans: DatadogLLMObsSpan[]): DatadogLLMObsRequestBody;
    protected uuidToBigInt(uuid: string): string;
    protected milisecondsToNanoseconds(ms: number): number;
    protected toDatadogSpanKind(kind: string): DatadogLLMObsSpanKind | null;
    protected transformInput(inputs: KVMap, spanKind: DatadogLLMObsSpanKind): DatadogLLMObsIO;
    protected transformOutput(outputs: KVMap | undefined, spanKind: DatadogLLMObsSpanKind): {
        output: DatadogLLMObsIO | undefined;
        tokensMetadata: Record<string, number>;
    };
    protected langchainRunToDatadogLLMObsSpan(run: Run): DatadogLLMObsSpan | null;
}