Module feature 

Typed Feature — named compose-vector of optional capabilities.

Cargo has [features]; npm has nothing native (peerDeps the closest analog); pip has extras_require; Composer has suggest; gem-spec has groups.

Adapters normalise to this shape; the resolver in gen-engine computes the active feature set per-package from the consumer tree.

Structs

Feature

One named feature. Optional dependencies are expressed via the implication graph: feature X implies feature Y + feature Y is "dep:some-optional-dep".

Enums

FeatureRef

Reference to a feature by name. Either local ("derive" → this package’s derive feature) or namespaced ("serde/derive" → another crate’s feature).