Is there any information on calling JS from Kotlin when targ

Question

Is there any information on calling JS from Kotlin when targeting WASM

jo · Answer

< ftomassetti> Have you seen the WASM documentation in Kotlin Native

olonho · Answer

generally JS interop is experimental now see <https github com JetBrains kotlin native blob master Interop JsRuntime src main kotlin jsinterop kt> for technical details of JS interop functionality

ftomassetti · Answer

< jo> yes I have seen the documentation and the example you posted but I could only see 2 libraries imported using jsinterop not how to use functions defined as external

ftomassetti · Answer

< olonho> yes I saw that file but it is not clear to me how to include JS functions I know I can define them as external but then the application crashes at runtime So far I only could mess up with the generated wasm js file to add into the libraries array entries for my JS functions that I defined as external but 1 I do not think this is the intended way to do that 2 It is a mess to convert the types

olonho · Answer

Practically speaking now jsinterop is mostly an internal tool So there s no intended way to use JS interop with external JS code

ftomassetti · Answer

Ok then I guess I am stuck to my trick I load the script without specifying the wasm attribute so it fails after having setup a few data structures At that point I add to the libraries array a new element with my mappings and when I launch WebAssembly directly It works but it is just awful smile

olonho · Answer

actually for us it is very interesting to know how do you plan to use K N WASM in applications We need this information to properly prioritize K N WASM target currently we assume that most web users would use Kotlin JS so WASM is not the top priority target

ftomassetti · Answer

In this case I need to create some examples for a presentation to a local meetup In practice I plan to write applications using several languages e g Rust amp Kotlin compiling all of them to WASM I understand this thing is not production ready but JS interoperability is really needed for even the most basic example

ftomassetti · Answer

Oh and I plan to publish an article on <http SuperKotlin com|SuperKotlin com> too slightly smiling face

ftomassetti · Answer

and I just did <https superkotlin com kotlin and webassembly > Thank you for your help