It would be nice to be able to use fetch instead of XMLHttpRequest. When using the non-native fetch polyfil Pretender would likely still work (because the polyfill uses XMLHttpRequest to implement fetch), but it doesn't seem that native fetch requests would be handled by Pretender.

Spec: https://fetch.spec.whatwg.org

This issue is mostly to lay out a path forward.

/cc @cowboyd @toranb