<Elegant way to validate multiple properties are n...

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Elegant way to validate multiple properties are non-null and report errors in Kotlin?
Given that I have an API model where all fields are nullable and a corresponding domain model where all fields are required:
data class MyApiModel(
val property1: Int?,
val property2: String?,
val property3: Boolean?,
)

data class MyDomainModel(
val property1: Int,
val property2: String,
val property3: Boolean,
)

I want to write a mapping function that will convert an instance of the API model to the domain model, validating that all of the field are non-null. I want...