react / react/react-native

Using useDeferredValue and Suspense unexpectedly shows fallback in ios/android but correctly shows stale state in web

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描述

Description

I'm following the examples from React on using useDeferredValue and Suspense to show a stale state. The correct behavior should be to show the fallback only on the first load, and then on subsequent queries (e.g. when typing in the search box or incrementing counter in the examples) show a stale state until new data is loaded (which then should replace the stale state). I've included an expo snack.

The correct behavior is observed in React Native web. However for android/ios the fallback always shows. For the snack I'm using React Native 0.76.7, which is the default version that a new expo project installs. I've also tested on 0.77.1 but get the same behavior.

In my actual project where I have ios/android folders I've tried explicitly setting newArchEnabled/isConcurrentRootEnabled like some of these older articles suggest, see here. However, the same behavior is observed with that as well.

Steps to reproduce
  1. Go to the expo snack https://snack.expo.dev/@polarwang/reactnative-suspense-usedeferredvalue-bug
React Native Version

0.76.7

Affected Platforms

Other (please specify)

Output of npx @react-native-community/cli info
info Fetching system and libraries information...
System:
  OS: macOS 15.2
  CPU: (16) arm64 Apple M3 Max
  Memory: 3.03 GB / 64.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.9.0
    path: ~/.nvm/versions/node/v20.9.0/bin/node
  Yarn:
    version: 1.22.22
    path: ~/.nvm/versions/node/v20.9.0/bin/yarn
  npm:
    version: 10.1.0
    path: ~/.nvm/versions/node/v20.9.0/bin/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/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-242.23339.11.2421.12700392
  Xcode:
    version: 16.2/16C5032a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: javac 22
    path: /Library/Java/JavaVirtualMachines/jdk-22.jdk/Contents/Home/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 18.0.0
    wanted: latest
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.7
    wanted: 0.76.7
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

info React Native v0.78.0 is now available (your project is running on v0.76.7).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.78.0
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.76.7&to=0.78.0
info For more info, check out "https://reactnative.dev/docs/upgrading?os=macos".
Stacktrace or Logs
There is no stacktrace but the behavior is illustrated in the snack
Reproducer

https://snack.expo.dev/@polarwang/reactnative-suspense-usedeferredvalue-bug

Screenshots and Videos

No response

贡献指南

打开贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

从链接的 Expo Snack 复现示例开始,将其 React Native iOS/Android 行为与 React Native web 进行比较。检查 issue 中描述的 useDeferredValue 和 Suspense 示例流程,然后验证原生端仅在首次加载时显示 fallback,并在后续查询期间显示过时内容。

由索引模型根据 Issue 内容生成。

评估

技术栈
react-native
领域
mobile
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
冷清
描述清晰度
基本清楚
新手友好度
48/100

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