The action that contains the isolated module imports.
We do it this way so that any require calls are relative to the calling
code and not this function. Note that we don't support promises here to
discourage dynamic import use, which doesn't play well with standard
jest yet.
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Isolate imports within a given action using jest.isolateModules.
This is a helper for the
jest.isolateModulesAPI, allowing code to avoid the clunky closure syntax in their tests.