import { BaseMessage } from "@langchain/core/messages";
import { BaseTransformOutputParser } from "@langchain/core/output_parsers";
export type HttpResponseOutputParserInput = {
    outputParser?: BaseTransformOutputParser;
    contentType?: "text/plain" | "text/event-stream";
};
/**
 * OutputParser that formats chunks emitted from an LLM for different HTTP content types.
 */
export declare class HttpResponseOutputParser extends BaseTransformOutputParser<Uint8Array> {
    static lc_name(): string;
    lc_namespace: string[];
    lc_serializable: boolean;
    outputParser: BaseTransformOutputParser;
    contentType: "text/plain" | "text/event-stream";
    constructor(fields?: HttpResponseOutputParserInput);
    _transform(inputGenerator: AsyncGenerator<string | BaseMessage>): AsyncGenerator<Uint8Array>;
    /**
     * Parses a string output from an LLM call. This method is meant to be
     * implemented by subclasses to define how a string output from an LLM
     * should be parsed.
     * @param text The string output from an LLM call.
     * @param callbacks Optional callbacks.
     * @returns A promise of the parsed output.
     */
    parse(text: string): Promise<Uint8Array>;
    getFormatInstructions(): string;
}