AbortSignal/AbortController doesn't work

Description

• AbortController / AbortSignal are used in javascript to cancel a request started with fetch, or any other async task that should be cancellable (docs here)
• In react native, there are several issues with these APIs:
  • DOMException, which is thrown when AbortController is used, doesn't actually exist as a type
  • Calling abortController.abort() doesn't actually have any effect, and abortSignal.reason is undefined.
  • abortSignal.throwIfAborted() doesn't exist as a function
  • I haven't fully verified this, but it looks like AbortController doesn't actually fully abort fetch requests.

Steps to reproduce

• Use javascript AbortController the way it's documented here

React Native Version

0.76.1

Affected Platforms

Runtime - Android, Runtime - iOS

Output of npx @react-native-community/cli info

System:
  OS: macOS 15.3.1
  CPU: (14) arm64 Apple M4 Max
  Memory: 175.34 MB / 36.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.14.0
    path: ~/.nvm/versions/node/v22.14.0/bin/node
  Yarn:
    version: 1.22.22
    path: ~/.nvm/versions/node/v22.14.0/bin/yarn
  npm:
    version: 10.9.2
    path: ~/.nvm/versions/node/v22.14.0/bin/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.16.2
    path: /Users/luisfinke/.rvm/gems/ruby-3.2.0/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.2
      - iOS 18.2
      - macOS 15.2
      - tvOS 18.2
      - visionOS 2.2
      - watchOS 11.2
  Android SDK: Not Found
IDEs:
  Android Studio: 2024.2 AI-242.23726.103.2422.13103373
  Xcode:
    version: 16.2/16C5032a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 23.0.1
    path: /usr/bin/javac
  Ruby:
    version: 3.2.0
    path: /Users/luisfinke/.rvm/rubies/ruby-3.2.0/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.1
    wanted: 0.76.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

Stacktrace or Logs

N/A

Reproducer

N/A

Screenshots and Videos

No response

Inizia con l’utilizzo documentato di AbortController e AbortSignal in React Native 0.76.1 per Android e iOS, verificando abort(), reason, throwIfAborted() e l’annullamento di fetch. Confronta il comportamento osservato con quello previsto dalla Web API; il lavoro è completato quando questi comportamenti dell’API segnalati sono supportati correttamente oppure le limitazioni rimanenti sono chiaramente coperte dai test.