import fetch, { Response, RequestInit } from 'node-fetch';
export { Response };
export type FetchInit = {
    url: string;
    body?: any;
} & Omit<RequestInit, 'body'>;
export declare abstract class FetchApi {
    protected abstract _invariantOkResponseAsync(init: FetchInit, response: Response): Promise<void>;
    protected _fetchAsync(fullInit: FetchInit): Promise<fetch.Response>;
    protected fetchJsonAsync(init: FetchInit): Promise<any>;
    protected fetchVoidAsync(init: FetchInit): Promise<void>;
}