Enums are not exported from type files. #98

I have enums in my type files, for example:

export enum DeliveryType {
HOME_DELIVERY = "homedelivery",
POST_PICKUP_POINT = "post_pickup_point",
CARGO_HOME_DELIVERY = "cargo_homedelivery",
}

If I import generated JSON to editor.swagger.io, following error is produced:

Semantic error at definitions.ShipmentDeliveryMethod.properties.deliveryType.$ref
$refs must reference a valid location in the document

The snippet from JSON which causes the error is:

"deliveryType": {
"$ref": "#/definitions/DeliveryType",
"title": "ShipmentDeliveryMethod.deliveryType"
}