import {
  Body as NodeBody,
  Headers as NodeHeaders,
  Request as NodeRequest,
  Response as NodeResponse,
  RequestInit as NodeRequestInit,
} from 'node-fetch';

declare namespace unfetch {
  export type IsomorphicHeaders = Headers | NodeHeaders;
  export type IsomorphicBody = Body | NodeBody;
  export type IsomorphicResponse = Response | NodeResponse;
  export type IsomorphicRequest = Request | NodeRequest;
  export type IsomorphicRequestInit = RequestInit | NodeRequestInit;
}

type UnfetchResponse = {
  ok: boolean;
  statusText: string;
  status: number;
  url: string;
  text: () => Promise<string>;
  json: () => Promise<any>;
  blob: () => Promise<Blob>;
  clone: () => UnfetchResponse;
  headers: {
    keys: () => string[];
    entries: () => Array<[string, string]>;
    get: (key: string) => string | undefined;
    has: (key: string) => boolean;
  };
};

type Unfetch = (
  url: string,
  options?: {
    method?: string;
    headers?: Record<string, string>;
    credentials?: 'include' | 'omit';
    body?: Parameters<XMLHttpRequest['send']>[0];
  }
) => Promise<UnfetchResponse>;

declare const unfetch: Unfetch;

export default unfetch;