In Kotlin/JS javascript arrays are represented as ...

# webassembly

[Robert Jaros]

In Kotlin/JS javascript arrays are represented as Array<T>, with size property (Kotlin syntax). In Kotlin/Wasm, JS arrays are represented as JsArray<T>, with length property (JS syntax). This makes writing code compatible with both targets (e.g. in common target) very hard at least. I've come up with some hacks based on expect/actual and dirty casts. Anyone has better ideas how to deal with this?

[bashor]

cc @Svyatoslav Kuzmich [JB]

[bashor]

Could you please provide more information why and how do you need JS Array

[Robert Jaros]

In this case I try to use browser Drag and Drop API.

[Robert Jaros]

org.w3c.dom.DataTransfer.types is an array

[Robert Jaros]

I just need to check the values.

[Robert Jaros]

It's trivial in Kotlin/JS, fairly easy in Kotlin/Wasm, but hard to do with the same code because of length/size property.

[Svyatoslav Kuzmich [JB]]

Expect/actuals with casts is probably the best approach to commonise this for now.
Ideally we’d want to have JsArray<T> and Wasm version of DOM API common between Kotlin/JS and Kotlin/Wasm, but the design is still in flux.