@sentry/react-native - Hermes Support

[HazAT]

The current version as of 1.0.1 we have very basic support for Hermes bundles meaning we are able to get function names but not showing the correct line number / source code for the crash.

In order for us to support it fully, we need to do some changes on how we process minified sources and source maps on the server.

Keep an eye on this issue if you are interested in this topic.

1.0.1

[motiz88]

@HazAT: Please let me know if there's anything we can do on the React Native side to make this easier.

[HazAT]

@motiz88 Thanks again :)

Is there any way to output the minified js bundle that hermes uses internally?
The reason we need the minified code is that we try to get the function name from the crashed line and our symbolication code needs the minified bundle in order to do this correctly.

We initially thought the x_facebook_source is used for that but in our examples the value in there is always null.

[motiz88]

x_facebook_sources is indeed designed for this (and is inherently more robust and complete than inspecting the bundled JS) so let's make it work. Can you share a complete example where it doesn't work for you?

[HazAT]

@motiz88 https://github.com/HazAT/testhermes

[HazAT]

@motiz88 Let me know if you need anything else.

[motiz88]

@HazAT React Native 0.61 updates Metro (transitively via the RN CLI) to a version that populates x_facebook_sources. Could you test against that? We did not bump the Metro dependency in RN 0.60 because it had unrelated breaking changes.

[HazAT]

@motiz88 there is no 0.61.0 in the RN CLI yet, but will try again

[HazAT]

@motiz88 I can confirm with 0.61.0 x_facebook_sources is filled, let's see when we find time implementing this :)

[tobi512]

Hi @HazAT, any timeline updates yet?
Would be great to see this as fast as possible since Hermes will drastically reduce our APK size and improve overall JS performance, two of our main pain points at the moment...