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Title
h

Hamza

06/21/2018, 6:48 AM
not sure how to implement it
g

gildor

06/21/2018, 6:52 AM
What do you exactly want? Kotlin already can be compiled to JavaScript and can use JS libraries and also Kotlin code can be shared between platforms (use the same Kotlin code on JVM and JS) Maybe I just didn’t get your question
h

Hamza

06/21/2018, 6:53 AM
okay so i’m using javalin currently. and i have a public folder in my resources with a bunch of javascript files. if i were to use kotlin js, i’m not sure how i would set it up
im currently using gradle for kotlin on the jvm
g

gildor

06/21/2018, 6:54 AM
Just compile Kotlin to JS and set this output js dir as a path with static content
h

Hamza

06/21/2018, 6:54 AM
and how do i go about doing that?
g

gildor

06/21/2018, 6:54 AM
It actually depends how you deploy your app
doing what? Compile to js or configure javalin?
h

Hamza

06/21/2018, 6:54 AM
compile
h

Hamza

06/21/2018, 6:56 AM
and will it do this to all files, or can i chose only to compile js files in a specific directory
g

gildor

06/21/2018, 6:56 AM
It exactly the same as with JVM
you create a gradle project (and configure it for Kotlin JS, see official docs, there is Gradle docs) put your sources to src dir and compile all of them
h

Hamza

06/21/2018, 6:57 AM
i don’t want to do all of them. only the ones i have in /resources
g

gildor

06/21/2018, 6:57 AM
I don’t understand you
to compile Kotlin source files to js you need a separate Gradle project
h

Hamza

06/21/2018, 6:57 AM

https://i.folder.rip/z2v53195ez.png

I already have all of these files running on Kotlin JVM
if i also want kotlin files to run on JS, where should i put them so that only they are compiled in JS?
g

gildor

06/21/2018, 6:58 AM
do you want to share some kotlin sources between JVM and JS?
h

Hamza

06/21/2018, 6:58 AM
yeah!
g

gildor

06/21/2018, 6:59 AM
h

Hamza

06/21/2018, 6:59 AM
oh, okay.
i’ll try that next project. thanks!
g

gildor

06/21/2018, 7:00 AM
you create a separate “common” module, put there all the sources that you want to share between platforms and add this module as dependency to platform specific moduls (jvm or js)
h

Hamza

06/21/2018, 7:00 AM
ah, okay
g

gildor

06/21/2018, 7:02 AM
don’t forget that you cannot use JVM or JS specific APIs on common code
but it’s a good way to share business logic or data objects
h

Hamza

06/21/2018, 7:03 AM
so if i create a multiplatform project, it will create 3 modules JVM JS and Common where jvm can use jvm stuff, js can use its stuff, and common can use neither,and is like a bridge between the two
g

gildor

06/21/2018, 7:08 AM
no, it’s not a bridge, you cannot connect js and jvm code (for example call js from jvm), you only can reuse some code
h

Hamza

06/21/2018, 7:09 AM
what code can be reused?
g

gildor

06/21/2018, 7:09 AM
pure Kotlin code that doesn’t use platform specific APIs
in Kotlin JS you can use browser API but you cannot do that in JVM
h

Hamza

06/21/2018, 7:10 AM
so like i can create data classes with a bunch of shared variables?
g

gildor

06/21/2018, 7:10 AM
also on JVM you can use Java APIs
shared variables?
it can be any code that you can write on pure Kotlin + it also supports actual/expect declarations
h

Hamza

06/21/2018, 7:10 AM
like
data class config(setting1: boolean, setting2: boolean)
type of thing
g

gildor

06/21/2018, 7:10 AM
check docs
You can share such data class, yes
h

Hamza

06/21/2018, 7:11 AM
okay. great. Thanks!
g

gildor

06/21/2018, 7:11 AM
but not only data classes, you have access to kotlin stdlib (excluding platform specific methods)
h

Hamza

06/21/2018, 7:11 AM
okay
g

gildor

06/21/2018, 7:12 AM
also good talk from Kotlin Team

https://www.youtube.com/watch?v=afc5PUs_EPE

h

Hamza

06/21/2018, 7:12 AM
ok. thanks!
g

gildor

06/21/2018, 7:13 AM
also a few articles about MPP on kotlin-academy https://blog.kotlin-academy.com/multiplatform/home
h

Hamza

06/21/2018, 7:13 AM
thanks alot!
g

gildor

06/21/2018, 7:16 AM
about your original question about JS, you can also keep using js specific API, just do not share it with JVM, you can have pure JS module, check docs about Kotlin JS
g

gregopet

06/21/2018, 8:05 AM
We're doing this: three modules, backend, JS and common
It works OK, we can reuse some code and of course we get static type checking for the part that gets compiled into Javascript
Using existing Javascript frameworks is a bit of a pain - we're using Vue and sometimes you just can't escape Javascript specifics
Kotlin for example tries to hide Javascript's handling of
this
while Vue depends on the default behavior
If I had to start again I'd try using React because JetBrains has some Kotlin integration
Specifically, we're sharing data transfer classes, some validation code, and we have URL paths defined in Kotlin objects so both parts of the web app can use them
It's still definitely two codebases though
We find that trying to reuse too much causes more pain than gain
d

david-wg2

06/21/2018, 8:59 AM
Writing pure vue is very simple, and it has great editor support. I would advice against trying to use kotlin for JavaScript.
g

gildor

06/21/2018, 9:07 AM
Imo vue uses too many dynamic magic under the hood so it works not so smooth as should. React less magic so works better. Kotlin specific UI framework would be probably even better
💯 1
1
p

poohbar

06/21/2018, 12:50 PM
while playing with vue I discovered it has a really cool hot-reload functionality, you save a file and the component in question updates in place without any actual browser reloading.. so smooth! does react offer that?
h

Hamza

06/21/2018, 12:51 PM
It Does!
p

poohbar

06/21/2018, 12:52 PM
cool
almost makes front end development fun.. almost
until you need to reconfigure webpack to do something a little bit different.. then good luck 😄
h

Hamza

06/21/2018, 12:53 PM
I'm yet to use the cool kotlin stuff. Still getting used to kotlin x html
p

poohbar

06/21/2018, 12:53 PM
yeah I just use Kotlin for JVM, for some reason Kotlin for JS rubs me the wrong way.. feels out of place
g

gregopet

06/21/2018, 1:05 PM
It is a bit - our Kotlin JS codebase is pretty small (just the admin backend), so we gave it a try
..would've been simpler to just write it in JS and we wouldn't be worse off
n

napperley

06/22/2018, 11:22 PM
If it is a web full stack project then using Kotlin JS would be preferred over JS for the front-end.