languageVersion

Target language version for the generated code.

Only valid when generateKotlinModels is true Must be either "1.4" or "1.5"

Using an higher languageVersion allows generated code to use more language features like sealed interfaces in Kotlin 1.5 for an example.

See also https://kotlinlang.org/docs/gradle.html#attributes-common-to-jvm-and-js

Default: use the version of the Kotlin plugin.