func newTypeResolver(pkg string, doc *spec.Document) *typeResolver {
resolver := typeResolver{ModelsPackage: pkg, Doc: doc}
resolver.KnownDefs = make(map[string]struct{}, 64)
for k, sch := range doc.OrigSpec().Definitions {
resolver.KnownDefs[k] = struct{}{}
if nm, ok := sch.Extensions["x-go-name"]; ok {
resolver.KnownDefs[nm.(string)] = struct{}{}
}
}
return &resolver
}