import type { FetchRequest, IConfigCatConfigFetcher } from "../ConfigFetcher.js";
import { FetchResponse } from "../ConfigFetcher.js";
export declare abstract class FetchApiConfigFetcherBase implements IConfigCatConfigFetcher {
    private readonly runsOnServerSide?;
    private logger;
    protected constructor(runsOnServerSide?: boolean | undefined);
    fetchAsync(request: FetchRequest): Promise<FetchResponse>;
    protected setRequestHeaders(requestInit: {
        headers?: [string, string][];
    }, headers: ReadonlyArray<readonly [string, string]>): void;
}
export declare class ClientSideFetchApiConfigFetcher extends FetchApiConfigFetcherBase {
    private static getFactory;
}
export declare class ServerSideFetchApiConfigFetcher extends FetchApiConfigFetcherBase {
    private static getFactory;
    constructor();
}