import { z } from "zod";
import { type JsonSchema7ObjectType } from "zod-to-json-schema";
import { Document, MappingDocumentTransformer } from "@langchain/core/documents";
import { ChatOpenAI } from "@langchain/openai";
import { BaseChain } from "../chains/base.js";
import { TaggingChainOptions } from "../chains/openai_functions/index.js";
/**
 * A transformer that tags metadata to a document using a tagging chain.
 */
export declare class MetadataTagger extends MappingDocumentTransformer {
    static lc_name(): string;
    protected taggingChain: BaseChain;
    constructor(fields: {
        taggingChain: BaseChain;
    });
    _transformDocument(document: Document): Promise<Document>;
}
export declare function createMetadataTagger(schema: JsonSchema7ObjectType, options: TaggingChainOptions & {
    llm?: ChatOpenAI;
}): MetadataTagger;
export declare function createMetadataTaggerFromZod(schema: z.AnyZodObject, options: TaggingChainOptions & {
    llm?: ChatOpenAI;
}): MetadataTagger;