/// <reference types="node" />
import { ClientRequest } from "http";
import { Feature, Options, Init, FetchOptions } from "..";
declare module ".." {
    interface Init {
        headers?: Record<string, string>;
    }
}
export declare class HeadersFeature implements Feature {
    forRequest(init: Init, options: Options): void;
    forRequestClient(init: Init, client: ClientRequest): Promise<void>;
    forFetch(init: Init, options: FetchOptions): void;
}