Jest mock not working when any transformer is configuration

When add any transformer or empty property transform to Jest config, mocks are not working. Simple code below.

Jest config:

"transform": {
any regex: any transformer
}

Module say:

module.exports = (m) => {
    console.log(m);
};

Module test-module:

const say = require("./say");

module.exports = () => {
    say("Hello world!");
};

Test:

jest.mock("./say", () => () => console.log("Mock!!!!"));

test("any test", () => {
});

If delete transform config, mock works, will get message: Mock!!!!.