🏠APIprotoNamespacesgoogleNamespacesprotobufNamespacesDescriptorProtoNamespacesExtensionRangeInterfaces$PropertiesOn this pageInterface: $Properties Properties of an ExtensionRange. Extended by IExtensionRange Properties end? optional end?: number | null Exclusive. options? optional options?: $Properties | null ExtensionRange options start? optional start?: number | null Inclusive.