[nodejs] unable to mock SVIX lib using jest

[sedhuait]

There aren’t any properties on the Svix prototype, so spyOn operation on Svix.prototype.application isn't working.
This also means that jest.mock("svix") will also fail.

exposing the sivx instance outside to enble mock isn't desired approach.

@svix-liam

[sedhuait]

https://replit.com/@sedhuait/svix-test#svix-service.spec.ts - sample

[svix-frank]

Hey @sedhuait thanks for reaching out, I'm hesitant to expose these resources without an underlying name change since as is they can cause confusing between our In/Out models, and I don't want to encourage usage of these classes independently of the main Svix class.

@svix-liam do you have any suggestions for how to make our Svix class more easily mockable? Worst case we can rename the inner classes to <TAG>Client and expose them but I would like to explore other options before adding to our exposed API.