Mock dependency in jest with typescript

Question

When testing a module that has a dependency in a different file. When assigning that module to be jest.Mock typescript gives an error that the method mock

Answer 1

I have found this in @types/jest:

/**
  * Wrap a function with mock definitions
  *
  * @example
  *
  *  import { myFunction } from "./library";
  *  jest.mock("./library");
  *
  *  const mockMyFunction = myFunction as jest.MockedFunction;
  *  expect(mockMyFunction.mock.calls[0][0]).toBe(42);
*/

Note: When you do const mockMyFunction = myFunction and then something like mockFunction.mockReturnValue('foo'), you're a changing myFunction as well.

Source: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/jest/index.d.ts#L1089