Ecosystem Reference

Each chapter here documents the ecosystem-specific behavior for one of the 14 supported package ecosystems — custom/private registry resolution, parser quirks, and any feature that is not shared broadly enough to belong in Cross-Ecosystem Features.

A feature shared by exactly two or three ecosystems (e.g. Bundler/Dart custom registries, Dart/Composer version comparison, NuGet/npm freshness, Swift/GitHub Actions freshness) is documented once, in whichever ecosystem it is most central to, with a cross-link from the other(s) — rather than duplicated.

See the Introduction for the at-a-glance table of manifest/lock file names and top-level feature coverage per ecosystem.