I’ve got some sugar functions that let me use kotlin data classes as the props type for functional c...

# react

[Rob Murdock]

I’ve got some sugar functions that let me use kotlin data classes as the props type for functional components, allowing for destructuring and other data class things. Is that of interest to people? I make extensive use of it in my own codebase now, and I’m guessing others have run into similar needs / interests

[chadmorrow]

I'd be curious to see what it looks like

[Rob Murdock]

Example of usage (reactFunction is my sugar):

data class PinSectionProps(
    val pinList: List<Pin>,
    val scale: PinButtonScale = PinButtonScale.Small,
    val canDrag: Boolean,
    val className: String
) : RProps

val PinSection = reactFunction<PinSectionProps> { (pinList, scale, canDrag, className) ->
    styledDiv {

etc etc

Code that does it (using the RClass<P> type for various reasons I can’t remember at the moment):

inline fun <reified P : RProps> reactFunction(crossinline function: RBuilder.(P) -> Unit): RClass<P> =
    buildReactFunction(P::class) { props ->
        buildElement { function(props) }
    }

fun <P : RProps> buildReactFunction(kClass: KClass<P>, builder: (props: P) -> ReactElement) = { props: P ->
    ensureKotlinClassProps(props, kClass.js)
        .let(builder)
}.unsafeCast<RClass<P>>()

private fun <P : RProps> ensureKotlinClassProps(props: P, jsClass: JsClass<P>): P = if (props::class.js == jsClass) {
    props
} else {
    val newProps = js("new jsClass()")
    objectAssign(newProps, props)
    newProps.unsafeCast<P>()
}

[Rob Murdock]

I also have a builder function that helps you add things like “key” and “children” to your props, so that’s a solved problem for me

[Rob Murdock]

I’m weighing the options of publishing it as a tiny library if its useful to people

[Joost Klitsie]

I am a noob, but I did encounter that I couldn't pass my props as a data class to a component and after that couldn't retrieve as such, so definitely looks very helpful 🙂

[Rob Murdock]

Ok, lib published. https://github.com/robertfmurdock/testmints/tree/master/minreact