Generate `typealias $className = Any` when type cannot be determined

[cmpaul]

Hi @pwall567 👋

We are generating a schema that will support any valid JSON and would love to have Kotlin codegen support for this.

As an example, consider the following Untyped type:

$defs:
  MyType:
    type: object
    properties:
      data:
        "$ref": "#/$defs/Untyped"
  Untyped:
    type:
    - array
    - boolean
    - integer
    - number
    - object
    - string

There is no error, but this simply fails to generate a data class for Untyped, and therefore the resulting Kotlin code does not compile.

In cases like this where a single type cannot be determined, one option is to generate a class with a typealias:

// Untyped.kt
typealias Untyped = Any

I have drafted a PR to demonstrate what we are looking for here: #27

What do you think?

[pwall567]

Hi @cmpaul , thanks for the suggestion.

I can see a lot of merit in what you're proposing, but if you don't mind, I'd like to think about it for a day or two. I'll get back to you shortly.

-Peter

[cmpaul]

Hi @pwall567 - Gentle check-in. We are not blocked, but I'm curious what your thoughts are. 🤓

[pwall567]

Hi @cmpaul – thanks for the gentle nudge, and I apologise for the fact that a few days has turned into a few weeks.

I have mixed feelings about your suggestion. I can see how in could be useful in some circumstances, but I am reluctant to add complications to the generator when there are alternative ways of achieving the same thing. I haven't tried it myself, but I think if you use a config file with:

{
  "customClasses": {
    "uri": {
      "id.of.schema#//$defs/Untyped": "Untyped"
    }
  }
}

and then supply a typealias Untyped = Any as a separate file, you will achieve the same effect, although admittedly in a more complicated manner.

On the other hand, your proposal is not overly complex, so I could be persuaded to incorporate it if you think the above workaround is unsatisfactory.

-Peter

[wiiitek]

@cmpaul, is it possible to also add templates + tests for JAVA and TypeScript?