ConfigSpec

Marks a data class as a config spec. The KSP processor generates a ConfigLoader.load<Name>() function and a Konstant.init<Name> function for it. Each primary-constructor parameter is a field; a parameter with a default is optional, and a nullable one without a default defaults to null. A parameter whose type is another @ConfigSpec class is loaded as a nested spec, with its keys prefixed by the parameter name (database.url, DATABASE_URL).

@ConfigSpec
data class AppConfig(
    val port: Int = 8080,
    val database: DatabaseConfig,
)