JSExport nullable properties

[sumanchakrabarti]

Anyone have ideas on how to get the JSExport to set the values as nullable by default?

public class MyCustomClass
{
    public string Property1 { get; set; }
    public string Property2 { get; set; }
}

turns into

export class MyCustomClass
{
    public property1 : string;
    public Property2 : string;
}

but I want it to be

export class MyCustomClass
{
    public property1 : string | undefined;
    public Property2 : string | undefined;
}