That would also be a nice complement to https://github.com/bashor/ts2kt

Even just a simple Kotlin data classes to TS code would be VERY useful for real projects if you allow to do that without generating a fat JS for the Kotlin stdlib (which is a blocker for most real-world use cases IMO)

I would be interested to contribute on a Kotlin -> TypeScript converter if you decide to move that way

https://kotlinlang.slack.com/archives/javascript/p1462745664000080 I don't sure that it's good to have another compilation step. I think it won't solve so many problem to be implemented(e.g. lazy init, support overloads). ES-X as target sounds more reasonable for me than TS. Anyway we'll keep this idea in mind when reworking our out.

Maybe someday ES will get type annotations simple smile

https://kotlinlang.slack.com/archives/javascript/p1462746222000082 TS backend itself won’t solve this issue, it'll only make the issue solvable by other tools

Make kotlin js out more understandable for tools is in our priority list.

https://kotlinlang.slack.com/archives/javascript/p1462780968000087 Welcome to contribute! simple smile

@bashor: if I would like to create a simple Kotlin data class -> TypeScript 2.0 converter prototype for domain model use case, do you have some hints about how I should do that? Should I use kotlin.reflect ? Is there some stuff from kotlin.js I could reuse?

reflection doesn’t work in kotlin.js now

only some parts supported now, like callable reference

You can hack compiler(JS-backend) or generate using kotlin JVM reflection

probably second is simpler for POC

Yep

I will do that

The idea would be to generate ligtweight TS code to be used with Angular 2 webapps for example

inside compiler look to

org.jetbrains.kotlin.js.translate.declaration.JsDataClassGenerator

That would allow to ensure that my Kotlin backend and Angular 2 frontend are using the same contracts for domain model (I know I should have to check Jackson annotation but I will start simple)

@sdeleuze We use KotlinJS to develop javascript SPA. We are replacing legacy WPF, VB and Flex applications with new KotlinJS apps. We use MVVM pattern, reactive like properties (a bit like bindable properties in JavaFX) and type safe builders for UI layout. Completely everything is strongly typed. We have built all the components from scratch (apart from charts) and it was actualy pretty easy. There isn't much angular can offer compared to KotlinJS. Type safe builders in Kotlin replace Angular templates and MVVM and bindable properties replace binding expressions.

Interesting, do you have some kind of virtual DOM?

Is it an open source project and/or could you share some code?

Maybe that https://github.com/jean79/yested

This is the first version without bindable properties and without MVVM. Unfortunately I have full version in my work only and cannot share it :(

I hope I will be able to open source it one day.

I don't use virtual dom, i modify the dom right away.

@jean: how do you deal with the fact that KotlinJS does not really support dynamic module loading? Do you require the browser to load big JS files at startup?

And how works your development workflow, do you have a file watcher that generate JS files each time your kotlin files are modified?

I have a monolithic application in one JS file together with fw code. Currently it makes 1MB, later i will separate fw code. So one application will live in one web context. I think there is no other way than to wait for proper module support in Javascript if we want to buils something like portlet portal.

Though caching applies. Users only download 3kb index file with references to cached versioned javascript files with compiled code.

Re workflow: I run Tomcat inside Idea. When I change the kotlin code, I manually trigger the compilation of kotlin code which gets compiled into the expanded deployed web app in target/APP