DefinitelyTyped/types/fetch-mock/fetch-mock-tests.ts

import * as fetchMock from "fetch-mock";

fetchMock.mock("http://test.com", 200);
fetchMock.mock("http://test.com", 200, {
    headers: {
        test: "header"
    }
});
fetchMock.mock(/test\.com/, 200);
fetchMock.mock(() => true, 200);
fetchMock.mock((url, opts) => true, 200);
fetchMock.once("http://test.com", 200);

fetchMock.mock(/test/, "test").mock(/test/, { a: "b" });
fetchMock.mock(/test/, {
    status: 200,
    headers: {
        test: "test"
    },
    body: {
        a: "b"
    }
});

fetchMock.restore().reset();

(fetchMock.calls().matched[0][1] as RequestInit).body;
fetchMock.calls().unmatched[0][0].toUpperCase();
fetchMock.calls("http://test.com")[0][0].toUpperCase();
(fetchMock.calls("http://test.com")[0][1] as RequestInit).body;

const doneStatus: boolean = fetchMock.done();
const doneStatusArguments: boolean = fetchMock.done("http://test.com");

const calledStatus: boolean = fetchMock.called();
const calledStatusArguments = fetchMock.called("http://test.com");

(fetchMock.lastCall()[1] as RequestInit).body;
const lastUrl: string = fetchMock.lastUrl();
fetchMock.lastOptions();

fetchMock.get("http://test.com", 200);
fetchMock.getOnce("http://test.com", 200);
fetchMock.post("http://test.com", 200);
fetchMock.postOnce("http://test.com", 200);
fetchMock.put("http://test.com", 200);
fetchMock.putOnce("http://test.com", 200);
fetchMock.delete("http://test.com", 200);
fetchMock.deleteOnce("http://test.com", 200);
fetchMock.head("http://test.com", 200);
fetchMock.headOnce("http://test.com", 200);
fetchMock.patch("http://test.com", 200);
fetchMock.patchOnce("http://test.com", 200);

fetchMock.get("http://test.com", 200, {method: "GET"});
fetchMock.post("http://test.com", 200, {method: "POST"});
fetchMock.put("http://test.com", 200, {method: "PUT"});
fetchMock.delete("http://test.com", 200, {method: "DELETE"});
fetchMock.head("http://test.com", 200, {method: "HEAD"});

fetchMock
  .mock("http://test.com", 200)
  .catch(503);

fetchMock
  .mock("http://test.com", 200)
  .spy();

const myMatcher: fetchMock.MockMatcherFunction = (
  url: string,
  opts: fetchMock.MockRequest
) => true;

fetchMock.flush().then(resolved => resolved.forEach(console.log));
fetchMock.flush().catch(r => r);