export declare class Fetcher<TResponse = never, TParams extends Record<string, unknown> = Record<string, unknown>, TReturnVal = TResponse> {
    protected url: string;
    protected params?: TParams;
    protected signal?: AbortSignal;
    protected headers: Record<string, string>;
    protected responseTransformer?: (data: TResponse) => TReturnVal;
    protected fetch: typeof fetch;
    constructor(url: string, config?: {
        params?: TParams;
        headers?: Record<string, string>;
        responseTransformer?: (data: TResponse) => TReturnVal;
    });
    then(onfulfilled?: ((value: TReturnVal) => TReturnVal) | null | undefined, onrejected?: ((reason: unknown) => PromiseLike<never>) | null | undefined): Promise<TReturnVal>;
    catch<TResult = never>(onrejected?: ((reason: unknown) => TResult | PromiseLike<TResult>) | undefined | null): Promise<TReturnVal | TResult>;
    finally(onfinally?: (() => void) | undefined | null): Promise<TReturnVal>;
    private dispatchRequest;
    addAbortSignal(signal?: AbortSignal): Promise<TReturnVal>;
}