mocking fs module causes Fs.statSync is not a function error

node version: 14.20.0
jest version: 28.1.1
ts-jest version: 28.0.5

I have following function which is to be tested

uploadFile.ts

import * as fs from 'fs';

export async function uploadFile(containerName, customerId, fileName, filePath, logCtx){
    fs.stat(filePath, (err, stats) => {
        if (err) {
            logger.error({err, ...logCtx}, `File doesn't exist. File path: ${filePath}`);
        } else {
            logger.info(logCtx, `File size: ${stats.size}`);
            if(stats.size < 1){
                logger.error({err, ...logCtx}, `Byte size is ${stats.size} - File is empty. File path: ${filePath}`);
                throw new Error("File is empty.")
            }
        }
    });
    // do some other things
}

The uploadFile function uses fs module and I decided to mock it since we don't need to do anything with files for testing

uploadFile.test.js

// mock fs package
const fs = { stat: jest.fn(), createReadStream: jest.fn() };

jest.mock("fs", () => {
  return fs;
});

it("should call fs.stat once", async () => {
  // Arrange
  const { uploadFile } = require("../../../lib/global/uploadFile");
  const containerName = "qz";
  const customerId = "w3";
  const fileName = "none.pdf";
  const filePath = "src/services/none.pdf";
  const logCtx = {};
  // Act
  await uploadFile(containerName, customerId, fileName, filePath, logCtx);
  // Assert
  expect(fs.stat).toBeCalledWith(filePath, expect.any(Function));
  expect(fs.stat).toBeCalledTimes(1);
});

when running the above test file, test case fails and shows the following error

 ● should call fs.stat once

    require-at: stat 'C:\guardian group\c360-accounts' failed: Fs.statSync is not a function

      at makeIt (node_modules/require-at/require-at.js:19:15)
      at requireAt (node_modules/require-at/require-at.js:35:10)
      at Object.<anonymous> (node_modules/mongoose/node_modules/mongodb/node_modules/optional-require/src/index.ts:318:64)
      at Object.<anonymous> (node_modules/mongoose/node_modules/mongodb/node_modules/optional-require/index.js:8:13) 

I have changed the mock of "fs" to the following hopeing it would resolve the error, and it is showing a different error instead.

const fs = { stat: jest.fn(), createReadStream: jest.fn(), statSync: jest.fn() };

The error

 ● should call fs.stat once                                                                                             
                                                                                                                         
    require-at: not a directory: 'C:\guardian group\c360-accounts'

      at makeIt (node_modules/require-at/require-at.js:23:28)
      at makeIt (node_modules/require-at/require-at.js:24:16)
      at requireAt (node_modules/require-at/require-at.js:35:10)
      at Object.<anonymous> (node_modules/mongoose/node_modules/mongodb/node_modules/optional-require/src/index.ts:318:64)
      at Object.<anonymous> (node_modules/mongoose/node_modules/mongodb/node_modules/optional-require/index.js:8:13)

What's happening here, am I missing something?

Thanks in advance