import { Agent as HttpAgent } from 'node:http';
import type { IActionContext } from '@comunica/types';
import type { Dispatcher } from 'undici';
import type { IActorHttpFetchArgs } from './ActorHttpFetch';
import type { IFetchInitPreprocessor } from './IFetchInitPreprocessor';
/**
 * Overrides the HTTP agent to perform better in Node.js.
 */
export declare class FetchInitPreprocessor implements IFetchInitPreprocessor {
    private readonly agent;
    private dispatcher;
    private cache;
    constructor(args: IActorHttpFetchArgs);
    protected createCache(args: IActorHttpFetchArgs): void;
    handle(init: RequestInit, context: IActionContext): Promise<RequestInit & {
        agent: (url: URL) => HttpAgent;
        dispatcher?: Dispatcher;
    }>;
}