Invalid Source map

[evolvingkid]

Bug Description

Error code is not connecting with the source map from IOS.

We use export SOURCEMAP_FILE="ios/main.jsbundle.map"; in the react native code and image to get the source mapping from the build generated from Xcode.

export SOURCEMAP_FILE="ios/main.jsbundle.map";
export PATH=/opt/homebrew/bin:$PATH
set -e

export NODE_BINARY=node
../node_modules/react-native/scripts/react-native-xcode.sh

Code in the Bundle React Native code and images in xcode.

This will generate a bundle.map file in the IOS directory. But when Bugsnag tries to get the error line it will fail.

We run a custom code to check if this specific error is coming from source map by running the below script.

const fs = require("fs");
const sourceMap = require("source-map");

const mapPath = "./main.jsbundle.map";

const minifiedLocation = { line: 1, column: 3497710 };
const sourceMapContent = fs.readFileSync(mapPath, "utf8");

sourceMap.SourceMapConsumer.with(sourceMapContent, null, (consumer) => {
  const originalPosition = consumer.originalPositionFor(minifiedLocation);
  console.log("mapped location", originalPosition);
});

This will output null as the result. mapped location { source: null, line: null, column: null, name: null }

• I have run gradle clean and confirmed this bug does not occur with JSC
• The issue is reproducible with the latest version of React Native.

Hermes git revision (if applicable):
React Native version: ^0.72.3
OS:

Platform (most likely one of arm64-v8a, armeabi-v7a, x86, x86_64): IOS iphone

Steps To Reproduce

1. Create a source map from Xcode.

code example:

The Expected Behavior

The source map should be pointing toward the error in the onPressRoundedNextLogin function.

  const onPressRoundedNextLogin = async (text) => {
    Bugsnag.notify(new Error('Test error'));
    }

[tmikov]

I am sorry, I understand that you are having a problem, but your description is referring to libraries and tools that are not part of Hermes. For example, I don't know what Bugsnag is, I don't know what "Create a source map from Xcode" means. Similarly, react-native/scripts/react-native-xcode.sh is not part of Hermes and I have no idea what it does.

Can you provide a minimal isolated reproduction that demonstrates a specific problem in Hermes?