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

[romanenko]

I have a strange error happening in 1.9 PhantomJS and latest Safari environments

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

pointing me to

fetch-mock/src/fetch-mock.js

Line 78 in b0ca36c

if (Request.prototype.isPrototypeOf(url)) {

I use it in my test like this

import fetchMock from 'fetch-mock'
//...
fetchMock.mock('http://my.api.url/v1/example', [{ ... }])

In Chrome, Firefox everything seems to work well.
Why could it happen and are there any advices how to debug it properly?

[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

[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!

[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.