Dart APIunself_licenseLicenseDatapackageLicenseBindings packageLicenseBindings property Null safety Map<String, List<int>> packageLicenseBindings final Implementation final Map<String, List<int>> packageLicenseBindings = <String, List<int>>{}; unself_license unself_license LicenseData packageLicenseBindings property LicenseData class Constructors LicenseData Properties firstPackage hashCode licenses packageLicenseBindings packages runtimeType Methods addLicense noSuchMethod sortPackages toString Operators operator ==