publicise.cs

private static void RewriteAssembly(string assemblyPath)
{
    ModuleDef assembly = ModuleDefMD.Load(assemblyPath);

    foreach (TypeDef type in assembly.Types.SelectMany(t => t.NestedTypes.Concat(t)))
    {
        type.Attributes &= ~TypeAttributes.VisibilityMask;

        if (type.IsNested)
        {
            type.Attributes |= TypeAttributes.NestedPublic;
        }
        else
        {
            type.Attributes |= TypeAttributes.Public;
        }

        foreach (MethodDef method in type.Methods)
        {
            method.Attributes &= ~MethodAttributes.MemberAccessMask;
            method.Attributes |= MethodAttributes.Public;
        }

        foreach (FieldDef field in type.Fields)
        {
            field.Attributes &= ~FieldAttributes.FieldAccessMask;
            field.Attributes |= FieldAttributes.Public;
        }
    }

    assembly.Write($"{Path.ChangeExtension(assemblyPath, null)}_public.dll");
}