Make it *not* use window.fetch if it is available

[Noitidart]

Is there a way to force isomorphic-fetch to force use polyfill? Even if window.fetch exists? Because in Microsoft Edge all fetch requests are failing - http://stackoverflow.com/a/43580982/1828637

[paulmelnikow]

If you don't find a way to do this with isomorphic-fetch, you can do it with fetch-ponyfill, which will always give you the whatwg implementation.

[Noitidart]

Very cool thank you @paulmelnikow !

[matthew-andrews]

I think @paulmelnikow suggestion is the best way to achieve what you're after. isomorphic-fetch simply passes all fetch logic to whatwg-fetch — so not really an easy way I can think of to force using the polyfill.