Hermes: Parse hermes stacktrace

[swabbass]

How do you manage to parse stack traces like this ? is there a doc about it

 anonymous@1:557290
    v@1:550772
    d@1:550459
    o@1:550087
    anonymous@1:557270
    v@1:550772
    d@1:550416
    o@1:550087
    global@1:549807

[willholen]

This is unfortunately underdocumented at the moment. You can symbolicate it using the metro-symbolicate package (installed by default in the RN template project), and pass it the generated source map and a stack trace:

npx metro-symbolicate android/app/build/generated/sourcemaps/react/release/index.android.bundle.map < stacktrace.txt

Note:

• The build process generates multiple source maps, one from the packager, one from the compiler, and one that merges the previous two. You have to use the merged map.
• If metro-symbolicate exits immediately with success, make sure the input comes from a pipe or redirection, and not from a terminal.
• The stack trace can be clean like yours, or in the midst of other information as when piped directly from adb log

[swabbass]

This is unfortunately underdocumented at the moment. You can symbolicate it using the metro-symbolicate package (installed by default in the RN template project), and pass it the generated source map and a stack trace:

npx metro-symbolicate android/app/build/generated/sourcemaps/react/release/index.android.bundle.map < stacktrace.txt

Note:

• The build process generates multiple source maps, one from the packager, one from the compiler, and one that merges the previous two. You have to use the merged map.
• If metro-symbolicate exits immediately with success, make sure the input comes from a pipe or redirection, and not from a terminal.
• The stack trace can be clean like yours, or in the midst of other information as when piped directly from adb log

Life saver, thx a lot :]

[willholen]

As an update, this is now part of the official React Native docs: https://reactnative.dev/docs/next/symbolication