import { IGatsbyState, ISetDomainRequestHeaders } from "../types";
/**
 * Takes in a domain and headers for that domain, from the setRequestHeaders action, and stores them in a Map to be accessed when making requests.
 */
export declare const setRequestHeadersReducer: (state: Map<string, {
    [header: string]: string;
}> | undefined, action: ISetDomainRequestHeaders) => IGatsbyState["requestHeaders"];