import { z } from "zod";
import type { JsonSchema7ObjectType } from "zod-to-json-schema/src/parsers/object.js";
import { Document } from "../document.js";
import { BaseChain } from "../chains/base.js";
import { BaseDocumentTransformer } from "../schema/document.js";
import { TaggingChainOptions } from "../chains/openai_functions/index.js";
import { ChatOpenAI } from "../chat_models/openai.js";
export declare class MetadataTagger extends BaseDocumentTransformer {
    protected taggingChain: BaseChain;
    constructor(fields: {
        taggingChain: BaseChain;
    });
    transformDocuments(documents: 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;