Make Pretender importable in node

[samselikoff]

👋 Hey all!

As we're getting Mirage to work in different environments, Pretender not being importable is causing us some headaches.

I know that having Pretender work in node is one thing, and that increases the scope of this project and requires more resources for maintenance, but is having it importable something that we could consider committing to?

If so we can take on the work & add some test coverage. That way Mirage can always "just import" Pretender and then decide at run-time whether to instantiate it.

Here's an older issue for reference: #192

cc @trek @stefanpenner

[stefanpenner]

@samselikoff sounds good, let's just ensure it is also tested so it does not regress.

[samselikoff]

sweet, we're going to work on this today

[samselikoff]

@stefanpenner any chance you could shed light on iife-wrapper? First time I'm seeing this (though I'm new to rollup & configuring builds). Seems like the self/iife there is what's causing the issue.