How can one write a custom serializer for a `Any` ...

# serialization

[Christian Sousa]

How can one write a custom serializer for a Any type?
I’m building a data class that has a field that can either come as a String or List<String> , and I don’t have any control over that. But when I need to serialize it, it will break because of typing issues.
Has anyone ever faced this issue and if yes, what’s a possible solution? (edited)

[russhwolf]

I haven't tried it but there's a sample in the docs now for how to handle this exact scenario with json https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/json_transformations.md#transformation-examples-list-mainupulation

[Christian Sousa]

Thank you, will look into that!

[Christian Sousa]

@russhwolf I was trying that but forgot one thing. I’,m in multiplatform, so I can’t get JsonTransformingSerializer any idea?

[russhwolf]

I haven't dug through all the new 0.20.0 stuff yet so not really sure, but I thought everything in there would be multiplatform. Make sure you have all the right gradle imports

[Christian Sousa]

Yeah, my bad. Just noticed I’m on an older version.. 😅

[russhwolf]

ah yeah that would do it