Breaking changes announcement for unstable

Scrumplex · April 27, 2026, 6:27am

fetcherVersion = 1 of fetchPnpmDeps has been deprecated and scheduled for removal in 26.11:

github.com/NixOS/nixpkgs

fetchPnpmDeps: deprecate fetcherVersion = 1, schedule removal for 26.11

master ← qweered:remove-fetcherVersion-1

opened 10:52PM - 24 Apr 26 UTC

qweered

+145 -146

Depends on #513204. Please review diff with whitespaces off. `fetcherVersion = …1` was kept around for backwards compatibility while callers migrated to `2`/`3`. With #494402 merged, only #513204 remains on master. This PR emits a `lib.warnIf` warning whenever `fetchPnpmDeps` is called with `fetcherVersion = 1`, giving callers advance notice before the planned removal in 26.11. Per @Scrumplex's review the warning fires immediately on merge rather than being gated by `lib.oldestSupportedReleaseIsAtLeast`, since 26.05 will not include any packages with `fetcherVersion = 1` once #513204 lands. After 26.11 ships, a follow-up PR should drop `1` from `supportedFetcherVersions` and clean up the dead v1 branches in `default.nix`, `pnpm-config-hook.sh`, and `serve.nix`. ## Things done - [x] Fits [CONTRIBUTING.md](https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md), [pkgs/README.md](https://github.com/NixOS/nixpkgs/blob/master/pkgs/README.md), [maintainers/README.md](https://github.com/NixOS/nixpkgs/blob/master/maintainers/README.md) and other READMEs. - Nixpkgs Release Notes - [x] Package update: when the change is major or breaking.

All packages in nixpkgs have been migrated to version 3. A warning is now emitted if fetcherVersion = 1 is used.