Mocking Typescript named export modules

myModule.ts

export const function1 = () => {
  return 'awesome'
}

export const function2 = () => {
  return 'not so awesome'
}

someTest.test.ts

/* 
This could be a test where myModule is dependent on.
Example shows how you can mock only one of the function among all the
exported functions in your module.
*/

import { function1 } from './myModule'
import { mocked } from 'ts-jest'

const mockedFunction1 = mocked(function1) // needed to get the types correct
jest.mock('./myModule', () => {
  return {
    ...(jest.requireActual('../../src/utils/commonUtil') as Record<string,any>),
    function1: jest.fn()  
  }
})
      
it('example 1', () => {
  mockedFunction1.mockImplementation(() => 'who cares')
  // your assertions here
})
      
it('example 2', () => {
  mockedFunction1.mockImplementation(() => 'can be anything')
  // your assertions here
})