useClassTransformer doesn't work when modelMode is set to interface

[aranoe]

Problem Statement:
As mentioned in #32 it is desirable to convert date types (date and date-time) to Date object instead of string. This currently only works with modelMode: "class". Setting modelMode: "interface" results in an error.

How to reproduce:
Run swagger-axios-codegen with following configuration:

const { codegen } = require("swagger-axios-codegen");

codegen({
  methodNameMode: "operationId",
  remoteUrl: "https://petstore.swagger.io/v2/swagger.json", 
  useClassTransformer: true,
  outputDir: "./out",
  modelMode: "interface",
  useStaticMethod: true
});

Example Error:

Argument of type 'unknown[]' is not assignable to parameter of type 'Pet | PromiseLike | undefined'.
Property 'then' is missing in type 'unknown[]' but required in type 'PromiseLike'

In addition to that, dates are not transformed to Date:

// https://petstore.swagger.io/v2/swagger.json
...
  "Order": {
    ...
     "shipDate": {
       "type": "string",
       "format": "date-time"
     }
    ...
  }
...

// generated index.ts
export interface Order {
 ...
  shipDate: string; // should be Date
 ...
}

[Manweill]

@aranoe
useClassTransformer is only work in modelMode='class'

[aranoe]

@Manweill I think this feature makes perfectly sense for interface models as well. If it's not possible to do with useClassTransformer another approach is desired.
Maybe a configuration name like useStringForDates with default value true would be suitable.

[Manweill]

Can add a setting to format the response result with the format in the swagger.json specification.

[aranoe]

@Manweill The format is already set to date-time as shown in the opening post. The problem is, that swagger-axios-codegen still transforms this to a string type. But the desired type would/can be Date too. This is already possible with class models (useClassTransformer), but not with interfaces.

[aranoe]

I just looked at your code and saw that it should already produce Date by default, when "type": "string" and "format": "date" /"format": "date-time"

https://github.com/aranoe/swagger-axios-codegen/blob/cb7bf85fe0f7db69b0131152b8f6cb64d9aff922/src/utils.ts#L86-L98

This seems like a bug now.

@Manweill can you confirm, when you run swagger-axios-codegen with the above configuration, that it also produces string instead of Date for shipDate in the Order model? I tested it multiple times now, with the same result.

[Manweill]

@aranoe
Emm，I haven't actually used this feature, so you may need to discuss it with @arkraft or you can submit your new idea.
Welcome PR.