Jest error -- Cannot read property 'get' of undefined

I have the configuration of a service inside a component in React and I am having problems with jest and testing-library, the app is working but the test is blocking.

  import { appSetupConfig } from '.../myapp'
  import theConfig from '.../config'

  useEffect(() => {
    const allowAppInstance = appSetupConfig();

    allowAppInstance.get(theConfig).then((value) => {
       if (value.something) {
           Do Something;
       } 
    ...the rest of code

  }, []);

This theConfig is an external file containing an object. This is the error:

  TypeError: Cannot read property 'get' of undefined

  37 |     const allowAppInstance = appSetupConfig();
  38 | 
> 39 |     allowAppInstance.get(theConfig).then((value) => {

Is there any way to mock this get in jest's setup.js? I don’t necessarily need to test this item yet, but I can’t proceed without it.

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