Nested custom object having oneOf in swagger file result in empty model after code generation

[dev49010]

I am in the following situation:

I have a class in C# language defining primitive types + 1 custom type.

public class User {
public string firstName { get; set; }
public string lastName { get; set; }
public CustomCredentials customCredentials { get; set; }
}

public class CustomCredentials {
public string password { get; set; }
}

User class appears in my .NetCore controller in the endpoint where it is used, as part of
[SwaggerResponse(200. typeof(User))]

The corresponding part for CustomCredentials into swagger.json file is

"customCredentials": {
"nullable:" true,
"oneOf": [
"$ref": "#components/schemas/customCredentials"
]
}

During code generation a warning appears reporting The schema for that class with an undefined type and 'allOf/anyOf/oneOf is a bit ambiguous. As side effect the generated typescript class for customCredentials is empty, while the parent class is ok.

As workaround if I manually replace oneOf with allOf in swagger file before the library generation then the model is populated correctly.

Is there a right way to approach this problem?

Thanks

[dev49010]

I am looking for the directive syntax to transform oneOf property into allOf property since it represents a solution.
I am able to write and use directives to reassign values but I haven't found the correct syntax to rename properties.

[lirenhe]

seems the ask is about the directive authoring, move it to autorest repo.

[timotheeguerin]

Autorest does not support oneOf or anyOf