import { HttpService } from '@nestjs/axios';
import { EngineExtension } from './engine.abstract';
export type ChatStreamEvent = {
    type: 'data' | 'error' | 'end';
    data?: any;
    error?: any;
};
export declare abstract class OAIEngineExtension extends EngineExtension {
    protected readonly httpService: HttpService;
    abstract apiUrl: string;
    constructor(httpService: HttpService);
    inference(createChatDto: any, headers: Record<string, string>, writableStream: WritableStream<ChatStreamEvent>, res?: any): void;
}