TypeError: undefined is not an object (evaluating 'Request.prototype')

[wheresrhys]

TypeError: undefined is not an object (evaluating 'Request.prototype')

[PixnBits]

I had the same error, but when using a dep package that itself used fetch (isomorphic-fetch).
The solution in my case was import/require order: be sure to load fetch-mock after anything that polyfills fetch.

[romanenko]

Yes, I had to polyfill fetch in Safari and PhantomJS. I'm using Karma with webpack and I had to require file with isomorphic-fetch before requiring any spec files.

Thank you very much!

[wheresrhys]

you probably need to polyfill fetch, and possibly Promise too https://github.com/wheresrhys/fetch-mock#troubleshooting. Let me know if that doesn't help