How to upgrade Yarn to Yarn Modern (v4 at the moment) seamlessly

.gitignore

.pnp.*
.yarn/*
!.yarn/patches
!.yarn/plugins
!.yarn/releases
!.yarn/sdks
!.yarn/versions

upgrade-yarn-to-berry.sh

#!/bin/sh

# Upgrade to latest Yarn Modern (v4 at the moment)
# WARNING: If you're running Node.js < 18:
# 1. Who hurt you?
# 2. Use `yarn set version 3.6.4` instead.
yarn set version berry

# (optional) Set nodeLinker to node-modules - this 100% guarantees backwards compatibility
# NOTE: Not needed in latest Yarn versions, this should be automatic
yarn config set nodeLinker node-modules

# (optional) Adds `yarn upgrade-interactive` command back
# NOTE: Not needed in Yarn v4, plugins are now included
yarn plugin import interactive-tools

# Reinstalls project using Yarn Modern. This will also update your yarn.lock file, but will 
# NOT sneakily upgrade the dependencies
yarn

# Commits the changes
git add . && git commit -m "Upgrade Yarn to Yarn Berry"

Thanks

Yes - nice cheat sheet. Much appreciated.

Thanks for the Gist!

I was upgrading from Yarn 1.x on a Node 12 project and got this message:

yarn set version stable
➤ YN0000: Retrieving https://repo.yarnpkg.com/4.0.0/packages/yarnpkg-cli/bin/yarn.js
➤ YN0001: Error: Invalid semver version. yarn --version returned:

I instead set an explicit version (h/t https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=995073):

yarn set version 2.4.2

That helped me make it the rest of the way.

Your gist seems to be exactly what I needed. Appreciate you sharing it