fix: add work overloads fix batchSize typing

[nomocas]

Closes #401

[nomocas]

Hi again,

The fail is weird regarding the commited change, which is just about the typing that is not used in any test, as all tests are pure JS.

Also, the test that is failing is not related to batchSize. (But whatever, as said above, the typing has nothing to do with the tests)

Build error:

retries
       should retry with a exponential backoff:
      AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

Of course, when I launch all the tests locally, no error.

Any idea ?