🚀 Breaking changes for Yarn 4

This issue is just there to keep track of which changes we might want to do once we’ll get to the next major release. Doesn’t mean it’ll be anytime soon 🙂 Will be updated as time passes and we think about more things.

• https://github.com/yarnpkg/berry/pull/4196
• https://github.com/yarnpkg/berry/pull/4218
• https://github.com/yarnpkg/berry/pull/4262
• https://github.com/yarnpkg/berry/pull/4261 (Removes yup)
• https://github.com/yarnpkg/berry/pull/4252
• https://github.com/yarnpkg/berry/pull/4254
• https://github.com/yarnpkg/berry/pull/4302
• https://github.com/yarnpkg/berry/pull/4299
• https://github.com/yarnpkg/berry/pull/4305 (uses npm: everywhere)
• https://github.com/yarnpkg/berry/pull/4253
• https://github.com/yarnpkg/berry/pull/3004
• https://github.com/yarnpkg/berry/pull/3691
• https://github.com/yarnpkg/berry/pull/4320
• https://github.com/yarnpkg/berry/pull/4589
• https://github.com/yarnpkg/berry/pull/4834
• https://github.com/yarnpkg/berry/pull/4524
• https://github.com/yarnpkg/berry/pull/4982
• Make commands git-aware again
  • Make yarn init initialize a git repository (already the case in 3.x)
  • Make yarn version create tags for the relevant workspaces
• Installer['getCustomDataKey']: “Move this method into Linker so that linkers can use it to save some state useful to findPackageLocator (cf PnpmLinker).”
• Make ReportError lazily generate report messages when provided a configuration object by the streams; this would allow us to remove the configuration parameter from many helper functions where we only use it for display purposes.
• Update yarn workspaces foreach recursive configuration; it’s not clear at the moment what should happen when -R and --since are used together. Perhaps we’d need a --recursive-dependents and --recursive-dependencies flag?
• https://github.com/yarnpkg/berry/pull/4595
• Cleanup https://github.com/yarnpkg/berry/pull/3612
  • https://github.com/yarnpkg/berry/pull/4641
  • Discuss the fetchPackageFromCache options bag.
• Transfer arcanis.vscode-zipfs to the Yarnpkg org
• Make Yarn detect whether it’s running inside a public repository (GitHub Actions) and, if it is AND the repository uses zero-installs, exit and recommend adding either --check-cache or --no-check-cache.
• Write a formal spec for the PnP data files, so that 3rd-party resolvers (in particular native resolvers) can implement their own (originally I pushed for it to be a JS API so that we had more freedom to extend/correct the file format as needed, but in 3.x we didn’t need to change it so it might now be stable enough that we can relinquish some control).
  • https://github.com/yarnpkg/berry/pull/4671
  • Consider only writing this data file by default, unless an option to generate an old-style .pnp.cjs file is set. (nope)
• https://github.com/yarnpkg/berry/pull/4503
• https://github.com/yarnpkg/berry/pull/4639
• https://github.com/yarnpkg/berry/pull/4644
• https://github.com/yarnpkg/berry/pull/4645
• https://github.com/yarnpkg/berry/pull/4648
• https://github.com/yarnpkg/berry/pull/4649
• https://github.com/yarnpkg/berry/pull/4697
• https://github.com/yarnpkg/berry/pull/4698
• https://github.com/yarnpkg/berry/pull/4773
• https://github.com/yarnpkg/berry/pull/4774
• https://github.com/yarnpkg/berry/pull/4865
• https://github.com/yarnpkg/berry/pull/4898
• https://github.com/yarnpkg/berry/pull/4899

[arcanis]

This is a no-go for OSS devs. E.g. I run vite-plugin-ssr’s test suite against Node 12 to make sure vite-plugin-ssr works with Node 12.

We don’t intend to support Node versions that aren’t maintained anymore by Node themselves. Not only to make our life easier, but also because some of our dependencies do that too, and need to be kept updated (thus making such Node requirements a necessity).

[magnattic]

The default value change for enableGlobalCache should be well documented when yarn 4 is released. This tripped me up when switching since we sync our local cache folder into our docker dev environment and I was confused why docker didn’t work anymore. I expect this might happen to a few other people.