React Native has not implemented fetch on top of native APIs, and the fetch polyfill built on top of XHR does not support streams where response.body is a getter for a ReadableStream.

React Native version:

0.61.4

Steps To Reproduce

Use fetch and see that response.body is undefined rather than a getter for a ReadableStream according the the fetch spec.

Describe what you expected to happen:

I expected for response.body to be defined.

Related issues

#9629
#12912
JakeChampion/fetch#746 (comment) (cc @MattiasBuelens)