fetch-mock/cjs/server.js

// avoid circular dependency when using jest.mock()
let fetch;
try {
	// note that jest is not a global, but is injected somehow into
	// the environment. So we can't be safe and check for global.jest
	// Hence the try/catch
	fetch = jest.requireActual('node-fetch'); //eslint-disable-line no-undef
} catch (e) {
	fetch = require('node-fetch');
}
const Request = fetch.Request;
const Response = fetch.Response;
const Headers = fetch.Headers;
const Stream = require('stream');
const FetchMock = require('./lib/index');
const http = require('http');
const { setUrlImplementation } = require('./lib/request-utils');
setUrlImplementation(require('whatwg-url').URL);

FetchMock.global = global;
FetchMock.statusTextMap = http.STATUS_CODES;
FetchMock.Stream = Stream;

FetchMock.config = Object.assign(FetchMock.config, {
	Promise: Promise,
	Request: Request,
	Response: Response,
	Headers: Headers
});

module.exports = FetchMock.createInstance();