public (string name, string content) GenerateSrcFileContent(ClassDeclarationSyntax classDeclaration, string usings)
{
var namespaceName = classDeclaration
.FindParent <NamespaceDeclarationSyntax>()
?.Name.ToString();
var converter = new RecordConverter();
var record = converter.ClassToRecord(classDeclaration);
var cb = new CodeBuilder();
var recordClass = converter.RecordToClass(record);
var output = new ClassFile(usings, namespaceName, recordClass);
output.WriteTo(cb);
return($"{recordClass.Name}.Builder", cb.ToString());
}