Fetch API does not support getReader (response.body is undefined)

Description

When trying to read the response from Fetch as a stream, via getReader(), I get an error saying that resp.body is undefined. Logging the value of resp shows this:

{"_bodyBlob": {"_data": {"__collector": [Object], "blobId": "xxx", "name": "chat.txt", "offset": 0, "size": 42, "type": "text/plain"}}, "_bodyInit": {"_data": {"__collector": [Object], "blobId": "xxx", "name": "chat.txt", "offset": 0, "size": 42, "type": "text/plain"}}, "bodyUsed": false, "headers": {"map": {"cache-control": "no-store", "content-length": "42", "content-type": "text/plain; charset=utf-8", "date": "Sun, 21 May 2023 18:53:09 GMT", "expect-ct": "max-age=2592000, report-uri=\"https://sentry.repl.it/api/10/security/?sentry_key=xxx\"", "replit-cluster": "hacker", "strict-transport-security": "max-age=6123043; includeSubDomains", "uwebsockets": "20"}}, "ok": true, "status": 200, "statusText": "", "type": "default", "url": "https://xxx.luisafk.repl.co/chat"}

Duplicate of #25701 and #25910, but they were closed.

React Native Version

0.71.7

Output of npx react-native info

System:
    OS: macOS 12.6.3
    CPU: (8) x64 Intel(R) Core(TM) i7-6920HQ CPU @ 2.90GHz
    Memory: 346.30 MB / 16.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 19.7.0 - ~/.nvm/versions/node/v19.7.0/bin/node
    Yarn: 1.22.15 - ~/.nvm/versions/node/v19.7.0/bin/yarn
    npm: 9.5.0 - ~/.nvm/versions/node/v19.7.0/bin/npm
    Watchman: Not Found
  Managers:
    CocoaPods: Not Found
  SDKs:
    iOS SDK: Not Found
    Android SDK: Not Found
  IDEs:
    Android Studio: Not Found
    Xcode: /undefined - /usr/bin/xcodebuild
  Languages:
    Java: Not Found
  npmPackages:
    @react-native-community/cli: Not Found
    react: 18.2.0 => 18.2.0 
    react-native: 0.71.7 => 0.71.7 
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Steps to reproduce

Try the code example below.

Snack, code example, screenshot, or link to a repository

const resp = await fetch('https://example.com');
const reader = resp.body.getReader();

Commencez par exécuter la reproduction fournie de fetch/getReader sur React Native 0.71.7 et examinez le comportement du corps de la réponse de la Fetch API. C’est terminé lorsque resp.body est disponible et que resp.body.getReader() fonctionne pour la réponse reproduite sans l’erreur undefined.