Next step in my Kotlin/JS journey, I would like to...

# javascript

[sdeleuze]

Next step in my Kotlin/JS journey, I would like to be able to use https://www.npmjs.com/package/rsocket-websocket-client, so I have added implementation(npm("rsocket-websocket-client", "0.0.16")) dependency to my project and I would like to consume RSocketWebSocketClient class defined like that in JS:

class RSocketWebSocketClient {
  constructor(options, encoders) {
    // ...
  }
  close() {
    // ...
  }
  connect() {
    // ...
  }
}
exports.default = RSocketWebSocketClient;

On Kotlin side, I have defined:

@JsModule("rsocket-websocket-client")
external class RSocketWebSocketClient(options: dynamic, encoders: dynamic)

fun main() {
	println("Hello JavaScript!")
	RSocketWebSocketClient(js("{}"), js("{}"))
}

And I get this error TypeError: RSocketWebSocketClient is not a constructor. What did I miss?

[sdeleuze]

It seems it works with:

@file:JsModule("rsocket-websocket-client")

@JsName("default")
external class RSocketWebSocketClient()

[sdeleuze]

I found this solution in https://stackoverflow.com/questions/51431848/how-to-import-node-module-in-react-kotlin, is this documented in the regular official documentation?

[tarek]

You can try using dukat to convert TypeScript types to kotlin external, it helped me with a lot of js modules

[tarek]

https://github.com/Kotlin/dukat

[sdeleuze]

Thanks yes I know dukat but RSocket JS client is using Facebook Flow so I have to convert things manually

[sdeleuze]

https://github.com/rsocket/rsocket-js