:app:bundleReleaseJsAndAssets hangs forever on Hermes

[MarekPawlowskiGelato]

react-native run-android --variant=release hangs forever on :app:bundleReleaseJsAndAssets.

After brief debugging it seems it hangs on hermes command:
../../node_modules/hermes-engine/osx-bin/hermes -emit-binary -out /Users/marekpawlowski/Workspace/my-app/android/app/build/generated/assets/react/staging/release/index.android.bundle.hbc /Users/marekpawlowski/Workspace/my-app/android/app/build/generated/assets/react/staging/release/index.android.bundle -O -output-source-map

It throws a lot of warnings like this:
/Users/marekpawlowski/Workspace/my-app/android/app/build/generated/assets/react/staging/release/index.android.bundle:28:134: warning: the variable "Promise" was not declared in function "isBoldTextEnabled" ...)(r(d[1])),t=r(d[2]),o=r(d[3]),s=new Map,c={isBoldTextEnabled:function(){return Promise.resolve(!1)},isGrayscaleEnabled:function(){return Promise.resolve(!1)},isInver... ^~~~~~~
and hangs... forever.

I've have played a little bit with this command and it seems that removing the last two args -O -output-source-map makes it working. (it still throws a lot of warning but it is not hanging)

React Native version:
System:
OS: macOS 10.14.6
CPU: (12) x64 Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
Memory: 5.05 GB / 32.00 GB
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 12.6.0 - ~/.nvm/versions/node/v12.6.0/bin/node
Yarn: 1.16.0 - /usr/local/bin/yarn
npm: 6.9.0 - ~/.nvm/versions/node/v12.6.0/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
SDKs:
iOS SDK:
Platforms: iOS 13.1, DriverKit 19.0, macOS 10.15, tvOS 13.0, watchOS 6.0
Android SDK:
API Levels: 23, 25, 26, 27, 28
Build Tools: 28.0.3
System Images: android-24 | Google APIs Intel x86 Atom, android-26 | Google Play Intel x86 Atom, android-27 | Google APIs Intel x86 Atom, android-28 | Google APIs Intel x86 Atom
Android NDK: 19.2.5345600
IDEs:
Android Studio: 3.3 AI-182.5107.16.33.5314842
Xcode: 11.1/11A1027 - /usr/bin/xcodebuild
npmPackages:
react: 16.9.0 => 16.9.0
react-native: 0.61.2 => 0.61.2
npmGlobalPackages:
react-native-cli: 2.0.1

Steps To Reproduce

1. Just react-native run-android --variant=release
   And it hangs forever:
   `<======-------> 50% EXECUTING [25m 31s]

IDLE
:app:bundleReleaseJsAndAssets`

Describe what you expected to happen:
Please verify source map building on hermes as it seems to be broken

[Sixzero]

Same issue. So I can't build release and signed builds.

[romanbarzyczakgelato]

same issue

[MarekPawlowskiGelato]

Switching off source map is temp sollution you can do this by adding following key to project.ext.react:
project.ext.react = [ enableHermes: true, // clean and rebuild if changing entryFile: "index.js", hermesFlagsRelease: [], ]

[ekmobile]

Same here, with hermesFlagsRelease: [] the build takes 3 minutes, without it takes over 11 minutes.

Do we loose anything by the workaround (e.g. performance)?

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as a "Discussion" or add it to the "Backlog" and I will leave it open. Thank you for your contributions.

[stale]

Closing this issue after a prolonged period of inactivity. If this issue is still present in the latest release, please feel free to create a new issue with up-to-date information.