google.golang.org/protobuf/reflect/protoregistry.Files.NumFilesByPackage (method)
one use
google.golang.org/protobuf/reflect/protoregistry (current package)
registry.go#L368: func (r *Files) NumFilesByPackage(name protoreflect.FullName) int {
The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)