React Native Tools debugging fails with recent React Native 0.85 / 0.86 Android Hermes apps
维护者通常 1 天内回复
评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 48/100
- Issue 类型
- 缺陷
- 描述清晰度
- 基本清楚
- 活跃度
- 冷清
- 技术栈
- react-native, typescript, vscode
- 领域
- devtools, mobile-dev
调研方向
从 README 的“Attach to Hermes application”配置开始，使用所述的最小 bare Android Hermes 应用重现该故障，并比较 React Native 0.74.x、0.85.3 和 0.86.x。跟踪 attach 路径以及针对所报告的 null 端口和未绑定断点的断点绑定行为；在较新版本中 VS Code 能够 attach 并绑定或命中 App.tsx 断点，即表示完成。
由索引模型根据 Issue 内容生成。
描述
🐛 What is the bug? How can we reproduce it?
React Native Tools does not seem to work reliably with recent React Native versions, specifically RN 0.85.x and 0.86.x, when debugging a bare React Native Android Hermes app from VS Code.
We tested a minimal bare React Native Android app with a single button and a breakpoint / debugger; statement inside the button onPress handler.
The app itself builds and runs on Android emulator, Metro is running, and Hermes inspector target is visible from Metro, but VS Code debugging does not work.
Summary of what we observed
React Native 0.74.x
Debugging worked.
With React Native 0.74.x and React Native Tools 1.13.0, Hermes attach worked and breakpoints in App.tsx were hit.
React Native 0.85.3
Debugging does not work.
With React Native 0.85.3 and React Native Tools 1.13.0, the debugger attaches or appears to attach, but breakpoints become unbound and are not hit.
With React Native 0.85.3 and React Native Tools 1.14.0, the extension fails earlier with:
Cannot read properties of null (reading 'port')
This happens even with the minimal attach config from the README:
{
"name": "Attach to Hermes application",
"cwd": "${workspaceFolder}",
"type": "reactnativedirect",
"request": "attach"
}
We also tried an explicit config:
{
"name": "Attach Hermes Android",
"cwd": "${workspaceFolder}",
"type": "reactnativedirect",
"request": "attach",
"platform": "android",
"address": "localhost",
"port": 8081,
"useHermesEngine": true,
"sourceMaps": true,
"trace": "log"
}
Expected behavior
React Native Tools should attach to the running Hermes app and bind/hit breakpoints in App.tsx, like it did with RN 0.74.x.
Actual behavior
With recent RN versions:
RN 0.85.3 + React Native Tools 1.13.0: breakpoints become unbound and do not hit.
RN 0.85.3 + React Native Tools 1.14.0: attach fails with Cannot read properties of null (reading 'port').
RN 0.86.x: debugging was also not successful in our tests.- 主要语言
- TypeScript
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