ERESOLVE unable to resolve dependency tree Found: @babel/core@7.9.6 and peer @babel/core@"^7.13.0"

[ankitmaloo]

Summary

Trying to install after upgrading to expo 42, but it gives errors with babel plugin. specifically these two:

Could not resolve dependency:
npm ERR! peer @babel/core@"^7.13.0" from @babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining@7.15.4

ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! Found: @babel/core@7.9.6
npm ERR! node_modules/@babel/core
npm ERR! dev @babel/core@"~7.9.6" from the root project
npm ERR! @babel/core@"^7.0.0" from metro-react-native-babel-transformer@0.59.0

Managed or bare workflow? If you have ios/ or android/ directories in your project, the answer is bare!

managed

What platform(s) does this occur on?

Android, iOS

SDK Version (managed workflow only)

42

Environment

NPM Version: 7.17.0

Expo CLI 4.10.0 environment info:
System:
OS: macOS 11.2.3
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 16.1.0 - /usr/local/bin/node
npm: 7.17.0 - /usr/local/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.10.1 - /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms: iOS 13.7, DriverKit 19.0, macOS 10.15, tvOS 13.4, watchOS 6.2
IDEs:
Android Studio: 4.2 AI-202.7660.26.42.7351085
Xcode: 11.7/11E801a - /usr/bin/xcodebuild
npmGlobalPackages:
expo-cli: 4.10.0
Expo Workflow: managed

Reproducible demo or steps to reproduce from a blank project

I can give you package.json which would help given everything is installed from there.

"devDependencies": {
"@babel/core": "~7.9.6"
},

[byCedric]

Hi @ankitmaloo! Thanks for writing in, unfortunately, this is a known issue with npm 7. With that version, npm decided to enforce installing peer dependencies again. This is something they tested in npm 2, but rolled back due to issues. This time it's causing issues again, as you can see here.

You should be able to install with npm install --legacy-peer-deps or use yarn install.

Hope this helps!

[ankitmaloo]

Hey,

Thanks for the answer. I did that and it worked atleast with babel.