staticcontract.1.cs

const string ContractPrefix = "App.Contract";
string ImportStatements(Class @class) 
{
    var otherTypesInFile = new List<Type>()
        .Concat(@class.Methods.Select(x => x.Type))
        .Concat(@class.Methods.SelectMany(x => x.Type.TypeArguments))
        .Concat(@class.Methods.SelectMany(x => x.Parameters).Select(x => x.Type))
        .Concat(@class.Methods.SelectMany(x => x.Parameters).SelectMany(x => x.Type.TypeArguments))
        .SelectMany(GetTypes)
        .ToList();

    if (@class.BaseClass != null){
        otherTypesInFile.Add(@class.BaseClass);
    }

    var imports = otherTypesInFile
        .Where(t => t.FullName.StartsWith(ContractPrefix))
        .Select(t => {
            return $"import {{ {t.Name} }} from \"../contract/{FileNameFromType(t.FullName)}\";";
        })
        .Distinct();

    return String.Join("\r\n", imports);
}