react native 0.57 cannot resolve module "@babel/plugin-external-helpers"

[HsuWai]

Description

• Build android is completed successfully, but, got error in node packager.

Issue can be reproduced like this:

react-native init MyApp
cd MyApp
react-native run-android

[fangcaiwen]

ios也一样的问题

[gutomarzagao]

Workaround: npm install --save-dev @babel/plugin-external-helpers

[HsuWai]

Fixed
npm install --save-dev @babel/plugin-external-helpers

[sunnylqm]

Seems related to this facebook/metro#198

[sopranolinist]

npm install --save-dev @babel/plugin-external-helpers does not work for me.
React Native Environment Info:
System:
OS: macOS High Sierra 10.13.6
CPU: x64 Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
Memory: 51.67 MB / 8.00 GB
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 10.10.0 - /usr/local/bin/node
Yarn: 1.9.4 - /usr/local/bin/yarn
npm: 6.4.1 - /usr/local/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
SDKs:
iOS SDK:
Platforms: iOS 12.0, macOS 10.14, tvOS 12.0, watchOS 5.0
IDEs:
Android Studio: 1.1.0 AI-135.1740770
Xcode: 10.0/10A255 - /usr/bin/xcodebuild
npmPackages:
react: 16.5.0 => 16.5.0
react-native: 0.57.0 => 0.57.0
npmGlobalPackages:
react-native-cli: 2.0.1
react-native-git-upgrade: 0.2.7

[HsuWai]

@sopranolinist After installing it, what's the error shown?

[sopranolinist]

@HsuWai same error as before adding the babel plugin package: Failed to load bundle(http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false) with error:(/Users/myMac/Desktop/Coding/react-native-redux-test/testApp/index.js: Cannot find module '@babel/plugin-external-helpers' (null))

[HsuWai]

Ok.. If so, I think you should take a look and try like what @sunnylqm said.

[sunnylqm]

Remember to restart packager after installing any package. My link above does not provide any direct fix, just for reference.

[hqwlkj]

@sunnylqm So, is there a way to solve this problem?

[sunnylqm]

@hqwlkj npm install --save-dev @babel/plugin-external-helpers and Remember to restart packager after installing any package.

[sopranolinist]

In addition to above suggestion, I rebooted and deleted old build folder and it worked - thanks

…

On Thu, Sep 20, 2018 at 12:52 AM Sunny Luo ***@***.***> wrote: @hqwlkj <https://github.com/hqwlkj> npm install --save-dev @babel/plugin-external-helpers and Remember to restart packager after installing any package. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#21214 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/Aor6QHGOJG_Ul2Efq9FKZafFF_sfEO6uks5uc0k_gaJpZM4WxZ8J> .

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