Optional type

[dodyg]

Is there anyway to generate typescript definition with optional type? This is especially important when trying to generate typescript interfaces automatically

[frhagn]

Hi @dodyg, could you please provide some more details about this? An example would be nice.

[dodyg]

How can I generate

interface Person {
  Name? : string
  Age? : string
}

[frhagn]

If you want it on all properties, just add the question mark in the template like this:

$Classes(*Models*)[
interface $Name { $Properties[
    $Name?: $Type;]
}]

Otherwise the problem is how to determine which properties should be decorated. One solution is to use attributes to mark optional properties in your c# classes e.g:

${
    var IsOptional = (Property p) => p.Attributes.Any(a => a.Name == "Optional");
}
$Classes(*Models*)[
interface $Name { $Properties[
    $Name$IsOptional[?]: $Type;]
}]

public class Person
{
    [Optional]
    public string Name { get; set; }
    public int Age { get; set; }
}

[dodyg]

This is exactly what I need. Thank you so much. I just created a dummy Optional attribute and tag the necessary properties with it

[AttributeUsage(AttributeTargets.All)]
public class OptionalAttribute : Attribute
{
}