How to mock xlsx / sheeetjs with jest?

Here is some code using xlsx library (=sheetjs):

import { read } from 'xlsx';

export default function foo(file){
  return read(file);
};

and here is a unit test for it:

import foo from '../../../src/components/upload/demo';
it('foo', () => {
  const mockedXlsx = {
    read: () => 'mocked_result'
  };
  jest.mock('xlsx', () => mockedXlsx);

  const mockedFile = {
    arrayBuffer: () => {}
  };
  spyOn(mockedFile, 'arrayBuffer');
  const result = foo(mockedFile);
  expect(result).toBe('mocked_result');
  expect(mockedFile.arrayBuffer).toHaveBeenCalled();
});

My package.json includes following dependency:

"xlsx": "https://cdn.sheetjs.com/xlsx-0.19.0/xlsx-0.19.0.tgz"

Instead of calling my mocked read function, the original function is called and I get the error

TypeError: e.slice is not a function

=> How should I adapt my code, so that jest.mock replaces the original read function?

I already tried to

a) Include __esModule: true in mockedXlsx

b) Include an entry for xlsx in jest.config moduleNameMapper:

'^xlsx$': '<rootDir>/node_modules/xlsx/dist/xlsx.full.min.js'

As a workaround, I changed the import to

import xlsx from 'xlsx';

I use the same import in the test and then, instead of jest.mock('xlsx',...) I can use

spyOn(xlsx,'read')