Can't find variable: Promise on react-native 0.56.0-rc2 release build

[francisco-sanchez-molina]

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• Search for existing issues: https://github.com/facebook/react-native/issues
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Environment

Run react-native info in your terminal and paste its contents here.

Scanning folders for symlinks in /Users/xxx/node_modules (16ms)

React Native Environment Info:
System:
OS: macOS High Sierra 10.13.4
CPU: x64 Intel(R) Core(TM) i7-6920HQ CPU @ 2.90GHz
Memory: 25.53 MB / 16.00 GB
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 8.11.1 - ~/.nvm/versions/node/v8.11.1/bin/node
Yarn: yarn install v0.22.0
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Saved lockfile.
Done in 31.50s. - /usr/local/bin/yarn
npm: 5.6.0 - ~/.nvm/versions/node/v8.11.1/bin/npm
Watchman: 4.7.0 - /usr/local/bin/watchman
SDKs:
iOS SDK:
Platforms: iOS 11.4, macOS 10.13, tvOS 11.4, watchOS 4.3
Android SDK:
Build Tools: 23.0.1, 25.0.0, 25.0.2, 25.0.3, 26.0.1, 26.0.2, 27.0.1, 27.0.2, 27.0.3
API Levels: 23, 24, 25, 26, 27
IDEs:
Xcode: 9.4.1/9F2000 - /usr/bin/xcodebuild
npmPackages:
react: 16.3.2 => 16.3.2
react-native: 0.56.0-rc.2 => 0.56.0-rc.2

Description

Ios App crash on release configuration setup (react-native run-ios --configuration Release)

Jun 19 14:39:49 silver xxx[10026]: *** Terminating app due to uncaught exception 'RCTFatalException: Unhandled JS Exception: Can't find variable: Promise (/Users/xxxx/Library/Developer/CoreSimulator/Devices/68A9BE18-20F4-4E67-A4F5-0BE26E9117A0/data/Containers/Bundle/Application/D4F542F8-E577-4260-96B1-65C9AD91F2D4/xxxx/main.jsbundle:820)', reason: 'Unhandled JS Exception: Can't find variable: Promise (/Users/xxxx/Librar...'

react-native run-ios works well

Reproducible Demo

react-native run-ios --configuration Release

[viniychuk]

Got the same issue in react-native 0.56.0-rc2, but my error is with "fetch" variable. Update to the node 10.4.1. didn't help. Debug configuration works fine, but Release doesn't.

[eshikerya]

same issue but with message Unhandled JS Exception: Can't find variable: regeneratorRuntime

[elicwhite]

Can you see if moving these two lines:

const ReactNativeVersionCheck = require('ReactNativeVersionCheck');
ReactNativeVersionCheck.checkVersions();

in InitializeCore

to be below the timerSetup fixes this crash?

[eshikerya]

@TheSavior moved down under line defineLazyTimer('cancelIdleCallback');still got same issue:
Unhandled JS Exception: Can't find variable: regeneratorRuntime

[kelset]

Closing this in favour of #19827 since the conversation seems to be moving forward over there