Override exported variable in file within __mocks__ folder in jest

I have a __mocks__ folder with a file called example.ts in it

File Content (shortened for simplicity)

export let token: string | null = "exampleString";

I have a test file where I use this variable in all the test cases.

There is one in particular where I want to override the value of this variable to be null

Approaches tried:

1. Use a proxy to try to intercept the variable when the function to be tested is called (no success, variable still set to exampleString
2. Use jest.spyOn to try and override the variable, still no success
3. Used jest.unmock('../../modules/__mocks__/example'); to try and use the real implementation of the file but no success

Has anyone got an idea on how to successfully override the value of the variable for a single test case?

Thanks

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