Should globals be saved during installation?

I think source-map-support is most frequently used in testing and I just ran into an issue where I was using sinon to set up a mock HTTP server during a test. If that test threw an exception, sinon would try to use XMLHTTPRequest to fetch the file / source map against the mock HTTP server, receive a 404, and fail to translate the stack trace. I think it may make sense to save globals like XMLHTTPRequest during installation so that even if they are mocked, source-map-support can use the original.

Comienza localizando la lógica de instalación y la ruta de obtención de source maps en source-map-support. Reproduce el fallo sustituyendo XMLHttpRequest por sinon y, después, verifica que source-map-support siga utilizando el objeto global original y traduzca correctamente el stack trace.

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