KotlinJs - simple HTTP GET without Dynamic Type functionality - http-get

Question

I'm totally new in KotlinJs and I wanted to check its potential in server-less service development.
I decided to start with calling external API with HTTP GET method using XMLHttpRequest() suggested in KotlinJs documentation. However, I cannot come up with any way of using it without dynamic mechanism.
fun main(args: Array<String>) {
val url = "https://jsonplaceholder.typicode.com/todos/1"
var xhttp: dynamic = XMLHttpRequest()
xhttp.open("GET", url, true)
xhttp.onreadystatechange = fun() {
if (xhttp.readyState == 4) {
println(xhttp.responseJson)
}
}
xhttp.send()
}
Of course this example works perfectly fine, but I feel like it has to be better way of doing it without disabling Kotlin's type checker.
Is there any way of doing it using KotlinJs only (without dynamic) ?
If it is not possible, could someone at least explain why?

Answer 1

I found a way for not using dynamic with callbacks, just like in classic .js
private fun getData(input: String, callback: (String) -> Unit) {
val url = "https://jsonplaceholder.typicode.com/todos/$input"
val xmlHttp = XMLHttpRequest()
xmlHttp.open("GET", url)
xmlHttp.onload = {
if (xmlHttp.readyState == 4.toShort() && xmlHttp.status == 200.toShort()) {
callback.invoke(xmlHttp.responseText)
}
}
xmlHttp.send()
}
and than just call it:
getData("1") {
response -> println(response)
}
Hopefully it will help someone in the future.