How to mock a module except ONE implementation

[GerroDen]

Hi,

I run into a problem in migrating to vitest from jest. I have to mock an external API module but this module also includes Error classes. In order properly be able to use instanceof Error I made this construct in jest.

jest.mock("api", () => {
  const { ResponseError } = jest.requireActual<typeof import("api")>("api");
  const mocks = jest.createMockFromModule<typeof import("api")>("api");
  return { ...mocks, ResponseError };
});

A similar approach in vitest does not work for me and nothing gets mocked.

vi.mock(import("api"), async (importOriginal) => {
  const { ResponseError } = await importOriginal();
  const mocks = await vi.importMock("api");
  return { ...mocks, ResponseError };
});

I can't find a solution but making a fake module only for the error class and I just tried to avoid it.

[hi-ogawa]

createMockFromModule is not supported yet and vi.importMock is not a same thing. We still have an issue for that #5482

[GerroDen]

Ok thanks for the answer. I wasn't able to find anything or how to word my problem accordingly 😅✌️