rewrite

type Config struct {
	Spec []*Spec
}

type Package struct {
	Files   map[string]*ast.File
	FileSet *token.FileSet
}

type Spec struct {
	TypeMap map[string]Type `yaml:"typeMap"`

	Name   string
	Import string
	Local  bool
}

type Type struct {
	Expr   string
	Import []string
}