Hello Is this possible to import a Kotlin multiplatform library directly through NPM for a 100% Javascript project ? If yes, what are the conditions for the library ?

Possible, yes https://kotlinlang.org/docs/js-to-kotlin-interop.html But very limited (for example

StateFlow

s cannot be exported).

> If yes, what are the conditions for the library ? Only symbols (classes, functions…) annotated with

@JsExport

are visible to JS code. You can learn more about the restrictions for that here: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.js/-js-export/ For those, the Kotlin compiler can also generate TS definition files (

*.d.ts

) so you can have auto-complete and type checks in your IDE.