FindAllSubPackages return all sub packages under importPath.

GuessPackageFromDir return importable package from dir if possible.

IsGoModDir return true if dir contains go.mod file.

ParseGoMod return go module and dep info in dir.

ParsePackagePaths return PackageList by parse paths, ignore vendor.

errors.

Module go mod info.

ModuleError go mod error.

PackageList contains Package info and support lookup efficiently.