mock a default export function in another module

foo.test.js

jest.mock('../utilities/prompt/prompt', () => {
  const originalModule = jest.requireActual('../utilities/prompt/prompt');
  return {
    __esModule: true,
    ...originalModule,
    default: jest.fn((args)=> {
      if(args.onConfirm){
        args.onConfirm('lost reason')
      }
    }),
  };
});

// then if you call prompt({onConfirm: callback}), test will callback function.